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Document and Entity Information Document - shares	3 Months Ended
Document and Entity Information Document - shares	Mar. 31, 2017	Apr. 21, 2017
Document Information [Line Items]
Entity Registrant Name	BRANDYWINE REALTY TRUST
Entity Central Index Key	0000790816
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding		175,327,436
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Document Information [Line Items]
Entity Registrant Name	BRANDYWINE OPERATING PARTNERSHIP, L.P.
Entity Central Index Key	0001060386
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q1
Amendment Flag	false

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Real estate investments:
Operating properties	$ 3,702,204	$ 3,586,295
Accumulated depreciation	(864,196)	(852,476)
Operating real estate investments, net	2,838,008	2,733,819
Construction-in-progress	166,372	297,462
Land held for development	153,268	150,970
Total real estate investments, net	3,157,648	3,182,251
Assets held for sale, net	6,262	41,718
Cash and cash equivalents	234,654	193,919
Accounts receivable, net of allowance of $2,622 and $2,373 in 2017 and 2016, respectively	12,099	12,446
Accrued rent receivable, net of allowance of $13,703 and $13,743 in 2017 and 2016, respectively	152,819	149,624
Investment in Real Estate Ventures, equity method	264,941	281,331
Deferred costs, net	92,425	91,342
Intangible assets, net	64,222	72,478
Other assets	116,792	74,104
Total assets	4,101,862	4,099,213
LIABILITIES AND EQUITY
Mortgage notes payable, net	320,484	321,549
Unsecured term loans, net	248,181	248,099
Unsecured senior notes, net	1,444,006	1,443,464
Accounts payable and accrued expenses	115,079	103,404
Distributions payable	30,047	30,032
Deferred income, gains and rent	30,592	31,620
Acquired lease intangibles, net	16,604	18,119
Liabilities related to assets held for sale	387	81
Other liabilities	16,916	19,408
Total liabilities	2,222,296	2,215,776
Commitments and contingencies
Equity:
6.90% Series E Preferred Shares, $0.01 par value; issued and outstanding- 4,000,000 in 2017 and 2016	40	40
Common Shares of Brandywine Realty Trust's beneficial interest, $0.01 par value; shares authorized 400,000,000; 175,202,404 and 175,140,760 issued and outstanding in 2017 and 2016, respectively	1,752	1,752
Additional paid-in-capital	3,262,459	3,258,870
Deferred compensation payable in common shares	14,244	13,684
Common shares in grantor trust, 936,939 in 2017, 899,457 in 2016	(14,244)	(13,684)
Cumulative earnings	560,422	539,319
Accumulated other comprehensive loss	(457)	(1,745)
Cumulative distributions	(1,961,739)	(1,931,892)
Total Brandywine Realty Trust's equity	1,862,477	1,866,344
Non-controlling interests	17,089	17,093
Total beneficiaries' equity	1,879,566	1,883,437
Total liabilities and beneficiaries' equity	4,101,862	4,099,213
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Real estate investments:
Operating properties	3,702,204	3,586,295
Accumulated depreciation	(864,196)	(852,476)
Operating real estate investments, net	2,838,008	2,733,819
Construction-in-progress	166,372	297,462
Land held for development	153,268	150,970
Total real estate investments, net	3,157,648	3,182,251
Assets held for sale, net	6,262	41,718
Cash and cash equivalents	234,654	193,919
Accounts receivable, net of allowance of $2,622 and $2,373 in 2017 and 2016, respectively	12,099	12,446
Accrued rent receivable, net of allowance of $13,703 and $13,743 in 2017 and 2016, respectively	152,819	149,624
Investment in Real Estate Ventures, equity method	264,941	281,331
Deferred costs, net	92,425	91,342
Intangible assets, net	64,222	72,478
Other assets	116,792	74,104
Total assets	4,101,862	4,099,213
LIABILITIES AND EQUITY
Mortgage notes payable, net	320,484	321,549
Unsecured term loans, net	248,181	248,099
Unsecured senior notes, net	1,444,006	1,443,464
Accounts payable and accrued expenses	115,079	103,404
Distributions payable	30,047	30,032
Deferred income, gains and rent	30,592	31,620
Acquired lease intangibles, net	16,604	18,119
Liabilities related to assets held for sale	387	81
Other liabilities	16,916	19,408
Total liabilities	2,222,296	2,215,776
Commitments and contingencies
Redeemable limited partnership units at redemption value; 1,479,799 issued and outstanding in 2017 and 2016	23,899	23,795
Equity:
6.90% Series E Preferred Shares, $0.01 par value; issued and outstanding- 4,000,000 in 2017 and 2016	96,850	96,850
General Partnership Capital 175,101,033 and 174,688,568 units issued and outstanding in 2016 and 2015, respectively	1,757,455	1,762,764
Accumulated other comprehensive loss	(822)	(2,122)
Total Brandywine Operating Partnership, L.P.'s equity	1,853,483	1,857,492
Non-controlling interest - consolidated real estate ventures	2,184	2,150
Total partners' equity	1,855,667	1,859,642
Total liabilities and beneficiaries' equity	$ 4,101,862	$ 4,099,213

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Accounts receivable, allowance	$ 2,622	$ 2,373
Accrued rent receivable, allowance	$ 13,703	$ 13,743
Preferred Stock, Shares Authorized	20,000,000	20,000,000
Preferred Stock, Dividend Rate, Percentage	6.90%	6.90%
Preferred Stock, Par or Stated Value Per Share (USD per share)	$ 0.01	$ 0.01
Preferred Stock, Shares Issued	4,000,000	4,000,000
Preferred Stock, Shares Outstanding	4,000,000	4,000,000
Common Stock, Par or Stated Value Per Share (USD per share)	$ 0.01	$ 0.01
Common Stock, Shares Authorized	400,000,000	400,000,000
Common Stock, Shares, Issued	175,202,404	175,140,760
Common Stock, Shares, Outstanding	175,202,404	175,140,760
Common Shares in Grantor Trust	936,939	899,457
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Accounts receivable, allowance	$ 2,622	$ 2,373
Accrued rent receivable, allowance	$ 13,703	$ 13,743
Preferred Stock, Dividend Rate, Percentage	6.90%	6.90%
Preferred Stock, Shares Issued	4,000,000	4,000,000
Preferred Stock, Shares Outstanding	4,000,000	4,000,000
Redeemable Limited Partnership Units Issued	1,479,799	1,479,799
Redeemable Limited Partnership Units Outstanding	1,479,799	1,479,799
General Partners' Capital Account, Units Issued	175,202,404	175,140,760
General Partners' Capital Account, Units Outstanding	175,202,404	175,140,760

Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenue
Rents	$ 103,332	$ 110,163
Tenant reimbursements	18,535	20,054
Termination fees	1,673	294
Third party management fees, labor reimbursement and leasing	6,485	5,235
Other	895	756
Total revenue	130,920	136,502
Operating expenses
Property operating expenses	36,885	40,879
Real estate taxes	11,749	11,886
Third party management expenses	2,447	2,010
Depreciation and amortization	45,892	48,873
General and administrative expenses	9,425	9,120
Provision for impairment	2,730	7,390
Total operating expenses	109,128	120,158
Operating income	21,792	16,344
Other income (expense)
Interest income	393	320
Interest expense	(21,437)	(23,691)
Interest expense - amortization of deferred financing costs	(634)	(774)
Interest expense - financing obligation	0	(281)
Equity in loss of Real Estate Ventures	(748)	(403)
Net gain on disposition of real estate	7,323	115,456
Net gain on Real Estate Venture transactions	14,582	5,929
Loss on early extinguishment of debt	0	(66,590)
Net income	21,271	46,310
Net income from continuing operations attributable to non-controlling interests - consolidated real estate ventures	(169)	(389)
Net income attributable to non-controlling interests	(169)	(389)
Net income attributable to Brandywine Realty Trust	21,102	45,921
Distribution to preferred shareholders	(1,725)	(1,725)
Nonforfeitable dividends allocated to unvested restricted shareholders	(99)	(105)
Net income attributable to Common Shareholders of Brandywine Realty Trust	$ 19,278	$ 44,091
Basic income per Common Share:
Continuing operations	$ 0.11	$ 0.25
Diluted income per Common Share:
Continuing operations	$ 0.11	$ 0.25
Basic weighted average shares outstanding	175,176,964	174,788,945
Diluted weighted average shares outstanding	176,201,872	175,471,413
Distributions declared per Common Share	$ 0.16	$ 0.15
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Revenue
Rents	$ 103,332	$ 110,163
Tenant reimbursements	18,535	20,054
Termination fees	1,673	294
Third party management fees, labor reimbursement and leasing	6,485	5,235
Other	895	756
Total revenue	130,920	136,502
Operating expenses
Property operating expenses	36,885	40,879
Real estate taxes	11,749	11,886
Third party management expenses	2,447	2,010
Depreciation and amortization	45,892	48,873
General and administrative expenses	9,425	9,120
Provision for impairment	2,730	7,390
Total operating expenses	109,128	120,158
Operating income	21,792	16,344
Other income (expense)
Interest income	393	320
Interest expense	(21,437)	(23,691)
Interest expense - amortization of deferred financing costs	(634)	(774)
Interest expense - financing obligation	0	(281)
Equity in loss of Real Estate Ventures	(748)	(403)
Net gain on disposition of real estate	7,323	115,456
Net gain on Real Estate Venture transactions	14,582	5,929
Loss on early extinguishment of debt	0	(66,590)
Net income	21,271	46,310
Net income from continuing operations attributable to non-controlling interests - consolidated real estate ventures	(5)	(2)
Net income attributable to Brandywine Realty Trust	21,266	46,308
Distribution to preferred shareholders	(1,725)	(1,725)
Nonforfeitable dividends allocated to unvested restricted shareholders	(99)	(105)
Net income attributable to Common Shareholders of Brandywine Realty Trust	$ 19,442	$ 44,478
Basic income per Common Share:
Continuing operations	$ 0.11	$ 0.25
Diluted income per Common Share:
Continuing operations	$ 0.11	$ 0.25
Basic weighted average shares outstanding	176,656,763	176,324,047
Diluted weighted average shares outstanding	177,681,671	177,006,515
Distributions declared per Common Share	$ 0.16	$ 0.15

Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands

3 Months Ended

Mar. 31, 2017

Mar. 31, 2016

Net income

$ 21,271

$ 46,310

Comprehensive income:

Unrealized gain (loss) on derivative financial instruments

1,014

(9,405)

Reclassification of realized losses on derivative financial instruments to operations, net

^[1]

286

246

Total comprehensive income (loss)

1,300

(9,159)

Comprehensive income

22,571

37,151

Comprehensive income attributable to non-controlling interest

(181)

(309)

Comprehensive income attributable to reporting entity

22,390

36,842

BRANDYWINE OPERATING PARTNERSHIP, L.P.

Net income

21,271

46,310

Comprehensive income:

Unrealized gain (loss) on derivative financial instruments

1,014

(9,405)

Reclassification of realized losses on derivative financial instruments to operations, net

^[1]

286

246

Total comprehensive income (loss)

1,300

(9,159)

Comprehensive income

22,571

37,151

Comprehensive income attributable to non-controlling interest

(5)

(2)

Comprehensive income attributable to reporting entity

$ 22,566

$ 37,149

[1]	Amounts reclassified from comprehensive income to interest expense within the Consolidated Statements of Operations.

Consolidated Statements of Beneficiaries' Equity - USD ($) $ in Thousands	Total	Preferred Stock [Member]	Common Stock [Member]	Deferred Compensation, Share-based Payments [Member]	Additional Paid-in Capital [Member]	Common Stock In Grantor Trust [Member]	Cumulative Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Cumulative Distributions [Member]	Noncontrolling Interest [Member]
Beginning Balance, Shares at Dec. 31, 2015		4,000,000	174,688,568	745,686
Beginning Balance at Dec. 31, 2015	$ 1,952,091	$ 40	$ 1,747	$ 11,918	$ 3,252,622	$ (11,918)	$ 499,086	$ (5,192)	$ (1,814,378)	$ 18,166
Net income	46,310						45,921			389
Other comprehensive income (loss)	(9,159)							(9,079)		(80)
Issuance of partnership interest in consolidated real estate venture	18									18
Share-based compensation activity, Shares			210,116
Share-based compensation activity	3,332		$ 2		3,296		34
Share Issuance from/(to) Deferred Compensation Plan, Shares			(8,252)	101,321
Share Issuance from/(to) Deferred Compensation Plan				$ 1,237		(1,237)
Adjustment to Non-controlling Interest					(10)					10
Preferred Share distributions	(1,725)								(1,725)
Distributions declared	(26,577)								(26,347)	(230)
Ending Balance, Shares at Mar. 31, 2016		4,000,000	174,890,432	847,007
Ending Balance at Mar. 31, 2016	1,964,290	$ 40	$ 1,749	$ 13,155	3,255,908	(13,155)	545,041	(14,271)	(1,842,450)	18,273
Beginning Balance, Shares at Dec. 31, 2016		4,000,000	175,140,760	899,457
Beginning Balance at Dec. 31, 2016	1,883,437	$ 40	$ 1,752	$ 13,684	3,258,870	(13,684)	539,319	(1,745)	(1,931,892)	17,093
Net income	21,271						21,102			169
Other comprehensive income (loss)	1,300							1,288		12
Issuance of partnership interest in consolidated real estate venture	29									29
Equity issuance costs	(219)				(219)
Bonus share issuance, Shares			6,752
Bonus share issuance	110				110
Share-based compensation activity, Shares			56,669	39,870
Share-based compensation activity	3,770				3,769		1
Share Issuance from/(to) Deferred Compensation Plan, Shares			(354)	(2,388)
Share Issuance from/(to) Deferred Compensation Plan	(48)			$ 560	(48)	(560)
Share Choice Plan Issuance, Shares			(1,423)
Adjustment to Non-controlling Interest					(23)					23
Preferred Share distributions	(1,725)								(1,725)
Distributions declared	(28,359)								(28,122)	(237)
Ending Balance, Shares at Mar. 31, 2017		4,000,000	175,202,404	936,939
Ending Balance at Mar. 31, 2017	$ 1,879,566	$ 40	$ 1,752	$ 14,244	$ 3,262,459	$ (14,244)	$ 560,422	$ (457)	$ (1,961,739)	$ 17,089

Consolidated Statements of Beneficiaries' Equity (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Distributions declared per Common Share	$ 0.16	$ 0.15
Cumulative Distributions [Member]
Distributions declared per Common Share	0.16	0.15
Noncontrolling Interest [Member]
Distributions declared per Common Share	$ 0.16	$ 0.15

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net income	$ 21,271	$ 46,310
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	45,892	48,873
Amortization of deferred financing costs	634	774
Amortization of debt discount/(premium), net	362	382
Amortization of stock compensation costs	3,124	2,296
Straight-line rent income	(5,895)	(6,104)
Amortization of acquired above (below) market leases, net	(1,338)	(2,232)
Straight-line ground rent expense	22	22
Provision for doubtful accounts	707	215
Net gain on real estate venture transactions	(14,582)	(5,929)
Net gain on sale of interests in real estate	(7,323)	(115,456)
Loss on early extinguishment of debt	0	66,590
Provision for impairment	2,730	7,390
Real Estate Venture loss in excess of distributions	748	723
Deferred financing obligation	0	(253)
Changes in assets and liabilities:
Accounts receivable	(917)	246
Other assets	(10,926)	(9,193)
Accounts payable and accrued expenses	9,089	6,296
Deferred income, gains and rent	(3,333)	(2,308)
Other liabilities	(6)	552
Net cash provided by operating activities	40,259	39,194
Cash flows from investing activities:
Proceeds from the sale of properties	74,159	704,911
Proceeds from real estate venture sales	27,230	4,812
Capital expenditures for tenant improvements	(11,408)	(13,949)
Capital expenditures for redevelopments	(5,505)	(6,199)
Capital expenditures for developments	(21,156)	(54,405)
Advances for the purchase of tenant assets, net of repayments	997	360
Investment in unconsolidated Real Estate Ventures	(4,910)	(14,414)
Deposits for real estate	268	(2,275)
Escrowed cash	(32,009)	6,991
Cash distribution from unconsolidated Real Estate Ventures in excess of cumulative equity income	8,306	1,436
Leasing costs paid	(4,129)	(4,716)
Net cash provided by investing activities	31,843	622,552
Cash flows from financing activities:
Repayments of mortgage notes payable	(1,215)	(267,172)
Proceeds from credit facility borrowings	0	195,000
Repayments of credit facility borrowings	0	(195,000)
Debt financing costs paid	0	(72)
Proceeds from the exercise of stock options	0	826
Shares used for employee taxes upon vesting of share awards	(129)	(289)
Partner contributions to consolidated real estate venture	29	18
Distributions paid to shareholders	(29,815)	(28,004)
Distributions to non-controlling interest	(237)	(230)
Net cash used in financing activities	(31,367)	(294,923)
Increase in cash and cash equivalents	40,735	366,823
Cash and cash equivalents at beginning of year	193,919	56,694
Cash and cash equivalents at end of period	234,654	423,517
Supplemental disclosure:
Cash paid for interest, net of capitalized interest during the three months ended March 31, 2017 and 2016 of $1,709 and $3,671, respectively	11,268	13,656
Supplemental disclosure of non-cash activity:
Dividends and distributions declared but not paid	30,047	28,278
Change in investment in real estate ventures as a result of dispositions	12,549	(1,130)
Change in investment in real estate ventures related to non-cash disposition of property	0	(25,165)
Change in capital expenditures financed through accounts payable at period end	1,273	4,235
Change in capital expenditures financed through retention payable at period end	(199)	753
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Cash flows from operating activities:
Net income	21,271	46,310
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	45,892	48,873
Amortization of deferred financing costs	634	774
Amortization of debt discount/(premium), net	362	382
Amortization of stock compensation costs	3,124	2,296
Straight-line rent income	(5,895)	(6,104)
Amortization of acquired above (below) market leases, net	(1,338)	(2,232)
Straight-line ground rent expense	22	22
Provision for doubtful accounts	707	215
Net gain on real estate venture transactions	(14,582)	(5,929)
Net gain on sale of interests in real estate	(7,323)	(115,456)
Loss on early extinguishment of debt	0	66,590
Provision for impairment	2,730	7,390
Real Estate Venture loss in excess of distributions	748	723
Deferred financing obligation	0	(253)
Changes in assets and liabilities:
Accounts receivable	(917)	246
Other assets	(10,926)	(9,193)
Accounts payable and accrued expenses	9,089	6,296
Deferred income, gains and rent	(3,333)	(2,308)
Other liabilities	(6)	552
Net cash provided by operating activities	40,259	39,194
Cash flows from investing activities:
Proceeds from the sale of properties	74,159	704,911
Proceeds from real estate venture sales	27,230	4,812
Capital expenditures for tenant improvements	(11,408)	(13,949)
Capital expenditures for redevelopments	(5,505)	(6,199)
Capital expenditures for developments	(21,156)	(54,405)
Advances for the purchase of tenant assets, net of repayments	997	360
Investment in unconsolidated Real Estate Ventures	(4,910)	(14,414)
Deposits for real estate	268	(2,275)
Escrowed cash	(32,009)	6,991
Cash distribution from unconsolidated Real Estate Ventures in excess of cumulative equity income	8,306	1,436
Leasing costs paid	(4,129)	(4,716)
Net cash provided by investing activities	31,843	622,552
Cash flows from financing activities:
Repayments of mortgage notes payable	(1,215)	(267,172)
Proceeds from credit facility borrowings	0	195,000
Repayments of credit facility borrowings	0	(195,000)
Debt financing costs paid	0	(72)
Proceeds from the exercise of stock options	0	826
Shares used for employee taxes upon vesting of share awards	(129)	(289)
Partner contributions to consolidated real estate venture	29	18
Distributions paid to shareholders	(30,052)	(28,234)
Net cash used in financing activities	(31,367)	(294,923)
Increase in cash and cash equivalents	40,735	366,823
Cash and cash equivalents at beginning of year	193,919	56,694
Cash and cash equivalents at end of period	234,654	423,517
Supplemental disclosure:
Cash paid for interest, net of capitalized interest during the three months ended March 31, 2017 and 2016 of $1,709 and $3,671, respectively	11,268	13,656
Supplemental disclosure of non-cash activity:
Dividends and distributions declared but not paid	30,047	28,278
Change in investment in real estate ventures as a result of dispositions	12,549	(1,130)
Change in investment in real estate ventures related to non-cash disposition of property	0	(25,165)
Change in capital expenditures financed through accounts payable at period end	1,273	4,235
Change in capital expenditures financed through retention payable at period end	$ (199)	$ 753

Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Supplemental disclosure:
Capitalized interest	$ 1,709	$ 3,671
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Supplemental disclosure:
Capitalized interest	$ 1,709	$ 3,671

Consolidated Statements of Partners' Equity - USD ($) $ in Thousands	Total	BRANDYWINE OPERATING PARTNERSHIP, L.P.	General Partner Capital [Member] BRANDYWINE OPERATING PARTNERSHIP, L.P.	Series E-linked Preferred Stock [Member] BRANDYWINE OPERATING PARTNERSHIP, L.P.	Accumulated Other Comprehensive Loss [Member]	Accumulated Other Comprehensive Loss [Member] BRANDYWINE OPERATING PARTNERSHIP, L.P.	Noncontrolling Interest [Member]	Noncontrolling Interest [Member] BRANDYWINE OPERATING PARTNERSHIP, L.P.
Beginning Balance at Dec. 31, 2015		$ 1,929,977	$ 1,836,692	$ 96,850		$ (5,597)		$ 2,032
Beginning Balance, Shares at Dec. 31, 2015			174,688,568	4,000,000
Net income	$ 46,310	46,310	$ 46,308				$ 389	2
Other comprehensive income (loss)	(9,159)	(9,159)			$ (9,079)	(9,159)	(80)
Share Issuance from/(to) Deferred Compensation Plan, Shares			(8,252)
Issuance of partnership interest in consolidated real estate venture	18	18					18	18
Share-based compensation activity	3,332	3,332	$ 3,332
Share-based compensation activity, Shares			210,116
Adjustment of redeemable partnership units to liquidation value at period end		(401)	$ (401)
Adjustment to non-controlling interest						1		(1)
Distribution to preferred shareholders	(1,725)	(1,725)	(1,725)
Distributions to general partnership unitholders		(26,347)	(26,347)
Ending Balance at Mar. 31, 2016		1,942,005	$ 1,857,859	$ 96,850		(14,755)		2,051
Ending Balance, Shares at Mar. 31, 2016			174,890,432	4,000,000
Beginning Balance at Dec. 31, 2016		1,859,642	$ 1,762,764	$ 96,850		(2,122)		2,150
Beginning Balance, Shares at Dec. 31, 2016			175,140,760	4,000,000
Net income	21,271	21,271	$ 21,266				169	5
Other comprehensive income (loss)	1,300	1,300			$ 1,288	1,300	12
Share Issuance from/(to) Deferred Compensation Plan	(48)	(48)	$ (48)
Share Issuance from/(to) Deferred Compensation Plan, Shares			(354)
Issuance of LP Units		(219)	$ (219)
Issuance of partnership interest in consolidated real estate venture	29	29					$ 29	29
Share Choice Plan Issuance, Shares			(1,423)
Bonus share issuance	110	110	$ 110
Bonus share issuance, Shares			6,752
Share-based compensation activity	3,770	3,769	$ 3,769
Share-based compensation activity, Shares			56,669
Adjustment of redeemable partnership units to liquidation value at period end		(340)	$ (340)
Distribution to preferred shareholders	$ (1,725)	(1,725)	(1,725)
Distributions to general partnership unitholders		(28,122)	(28,122)
Ending Balance at Mar. 31, 2017		$ 1,855,667	$ 1,757,455	$ 96,850		$ (822)		$ 2,184
Ending Balance, Shares at Mar. 31, 2017			175,202,404	4,000,000

Consolidated Statements of Partners' Equity (Parenthetical) - BRANDYWINE OPERATING PARTNERSHIP, L.P. - $ / shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Distributions to general partnership unitholders (USD per share)	$ 0.16	$ 0.15
General Partner Capital [Member]
Distributions to general partnership unitholders (USD per share)	$ 0.16	$ 0.15

Organization of the Parent Company and The Operating Partnership	3 Months Ended
	Mar. 31, 2017
Organization Consolidation And Presentation Of Financial Statements [Abstract]
ORGANIZATION OF THE PARENT COMPANY AND THE OPERATING PARTNERSHIP	1. ORGANIZATION OF THE PARENT COMPANY AND THE OPERATING PARTNERSHIP The Parent Company is a self-administered and self-managed real estate investment trust (“REIT”) that provides leasing, property management, development, redevelopment, acquisition and other tenant-related services for a portfolio of office, residential, retail and mixed-use properties. The Parent Company owns its assets and conducts its operations through the Operating Partnership and subsidiaries of the Operating Partnership. The Parent Company is the sole general partner of the Operating Partnership and, as of March 31, 2017, owned a 99.2% interest in the Operating Partnership. The Parent Company’s common shares of beneficial interest are publicly traded on the New York Stock Exchange under the ticker symbol “BDN”. As of March 31, 2017, the Company owned 104 properties that contain an aggregate of approximately 16.5 million net rentable square feet and consist of 90 office properties, six mixed-use properties, one retail property (97 properties, collectively the “Core Properties”), three development properties, three redevelopment properties and one property classified as held for sale (collectively, the “Properties”). In addition, as of March 31, 2017, the Company owned economic interests in 13 unconsolidated real estate ventures (collectively, the “Real Estate Ventures”), seven of which own properties that contain an aggregate of approximately 8.0 million net rentable square feet of office space; two of which own 4.3 acres of undeveloped parcels of land; two of which own 1.4 acres of land under active development and two of which own residential towers that contain 345 and 321 apartment units, respectively. As of March 31, 2017, the Company also owned 312 acres of undeveloped land and held options to purchase approximately 60 additional acres of undeveloped land. As of March 31, 2017, the total potential development that these land parcels could support, including the parcels under option, under current zoning and entitlements, amounted to an estimated 12.2 million square feet. The Properties and the properties owned by the Real Estate Ventures are located in or near Philadelphia, Pennsylvania; Metropolitan Washington, D.C.; Southern New Jersey; Richmond, Virginia; Wilmington, Delaware and Austin, Texas. In addition to managing properties owned by the Company, as of March 31, 2017, the Company was managing approximately 10.2 million net rentable square feet of office and industrial properties for third parties and Real Estate Ventures. The Company conducts its third-party real estate management services business primarily through wholly-owned management company subsidiaries. As of March 31, 2017, the management company subsidiaries were managing properties containing an aggregate of approximately 26.7 million net rentable square feet, of which approximately 16.5 million net rentable square feet related to Properties owned by the Company and approximately 10.2 million net rentable square feet related to properties owned by third parties and Real Estate Ventures. Unless otherwise indicated, all references in this Form 10-Q to square feet represent net rentable area.

Basis of Presentation	3 Months Ended
Basis of Presentation	Mar. 31, 2017
Accounting Policies [Abstract]
BASIS OF PRESENTATION	2. BASIS OF PRESENTATION Basis of Presentation The consolidated financial statements have been prepared by the Company pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (“SEC”) for interim financial statements. Certain information and footnote disclosures normally included in the annual financial statements prepared in accordance with accounting principles generally accepted in the United States of America ("U.S. GAAP") have been condensed or omitted pursuant to such rules and regulations. In the opinion of management, all adjustments (consisting solely of normal recurring matters) for a fair statement of the financial position of the Company as of March 31, 2017, the results of its operations for the three-month periods ended March 31, 2017 and 2016 and its cash flows for the three-month periods ended March 31, 2017 and 2016 have been included. The results of operations for such interim periods are not necessarily indicative of the results for a full year. These consolidated financial statements should be read in conjunction with the Parent Company’s and the Operating Partnership’s consolidated financial statements and footnotes included in their combined 2016 Annual Report on Form 10-K filed with the SEC on March 1, 2017. The Company's Annual Report on Form 10-K for the year ended December 31, 2016 contains a discussion of our significant accounting policies under Note 2, "Summary of Significant Accounting Policies". There have been no significant changes in our significant accounting policies since December 31, 2016. Management discusses our significant accounting policies and management’s judgments and estimates with the Company's Audit Committee. Reclassifications During the first quarter of 2017, the Company adopted ASU 2016-09, Improvements to Employee Share-Based Payment Accounting (“ASU 2016-09”), which requires the Company to reclassify employer tax payments on account of employee tax withholdings on share-based awards from operating activities to financing activities. Prior to the issuance of ASU 2016-09, there was no guidance on the classification of cash paid by an employer to the taxing authorities when directly withholding shares for tax withholding purposes. As a result of the adoption, a $0.3 million cash outflow has been reclassified in the March 31, 2016 consolidated statements of cash flows from operating activities to financing activities. There was no other impact from the adoption of this guidance. During the quarter ended December 31, 2016, the Company early adopted ASU 2016-15, “Classification of Certain Cash Receipts and Cash Payments” (“ASU 2016-15”), which clarifies that debt prepayment costs should be presented as financing activities in the statement of cash flows. As a result of the adoption, $53.4 million was reclassified in the consolidated statements of cash flows from the operating activities section to the financing activities section of the consolidated statements of cash flows, within the “Repayment of mortgage notes payable” caption, for the three-months period ended March 31, 2016. There was no other impact from the adoption of this guidance. Recent Accounting Pronouncements On February 22, 2017, the FASB issued ASU No. 2017-05 (“ASU 2017-05) to provide guidance for recognizing gains and losses from the transfer of nonfinancial assets and in-substance non-financial assets in contracts with non-customers, unless other specific guidance applies. The standard requires a company to derecognize nonfinancial assets once it transfers control of a distinct nonfinancial asset or distinct in substance nonfinancial asset. Additionally, when a company transfers its controlling interest in a nonfinancial asset, but retains a noncontrolling ownership interest, the company is required to measure any non-controlling interest it receives or retains at fair value. The guidance requires companies to recognize a full gain or loss on the transaction. As a result of the new guidance, the guidance specific to real estate sales in ASC 360-20 will be eliminated. As such, sales and partial sales of real estate assets will now be subject to the same derecognition model as all other nonfinancial assets. The guidance is effective for annual periods beginning after December 15, 2017, including interim periods within that reporting period. The effective date of this guidance coincides with revenue recognition guidance. The Company is in the process of evaluating the impact of this new guidance and on its consolidated financial statements. The Company expects to utilize the modified retrospective approach. On January 5, 2017, the FASB issued ASU No. 2017-01 (“ASU 2017-01”) to amend the guidance for determining whether a transaction involves the purchase or disposal of a business or an asset. The amendments clarify that when substantially all of the fair value of the gross assets acquired or disposed of is concentrated in a single identifiable asset or a group of similar assets, the set of assets and activities is not a business. ASU 2017-01 is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years and early adoption is permitted for transactions which have not been previously reported in financial statements that have been issued. The Company adopted the guidance on the issuance date effective January 2017. The Company expects that most of its real estate acquisitions will be considered asset acquisitions under the new guidance and that transaction costs will be capitalized to the investment basis which is then subject to a purchase price allocation based on relative fair value.

Real Estate Investments

3 Months Ended

Mar. 31, 2017

Real Estate [Abstract]

REAL ESTATE INVESTMENTS

3. REAL ESTATE INVESTMENTS

As of March 31, 2017 and December 31, 2016, the gross carrying value of the Properties was as follows (in thousands):

	March 31,		December 31,
	2017		2016
Land	$	462,014	$	469,522
Building and improvements		2,801,495		2,683,087
Tenant improvements		438,695		433,686
Operating properties		3,702,204		3,586,295
Assets held for sale - real estate investments (a)		5,576		73,591
Total	$	3,707,780	$	3,659,886

(a)	Real estate investments related to assets held for sale above represents gross real estate assets and does not include accumulated depreciation or other assets on the balance sheet of the property held for sale. See “Held for Sale” below in this Note 3.

Dispositions

The Company sold the following eight office properties and one mixed-use property during the three-month period ended March 31, 2017 (dollars in thousands):

Disposition Date	Property/Portfolio Name	Location	Number of Properties	Rentable Square Feet		Sales Price		Net Proceeds on Sale		Gain/(Loss) on Sale (a)
March 30, 2017	200, 210 & 220 Lake Drive East (Woodland Falls)	Cherry Hill, NJ	3		215,465	$	19,000	$	17,771	$	(249	)	(b)
March 15, 2017	Philadelphia Marine Center (Marine Piers)	Philadelphia, PA	1		181,900		21,400		11,182		6,498		(c)
March 13, 2017	11700, 11710, 11720 & 11740 Beltsville Drive (Calverton)	Beltsville, MD	3		313,810		9,000		8,354		-		(d)
February 2, 2017	1200 & 1220 Concord Avenue (Concord Airport Plaza)	Concord, CA	2		350,256		33,100		32,010		551		(e)
Total Dispositions			9		1,061,431	$	82,500	$	69,317	$	6,800

(a)	Gain/(Loss) on Sale is net of closing and other transaction related costs.

(b)	During the fourth quarter of 2016, the Company recognized a $7.3 million impairment related to these properties.

(c)

On March 15, 2017, the Company sold its sublease interest in the Piers at Penn’s Landing (the “Marine Piers”), which includes leasehold improvements containing 181,900 net rentable square feet, and a marina, located in Philadelphia, Pennsylvania for a sales price of $21.4 million, which will be paid in two installments. On the closing date, the buyer paid $12.0 million in cash. On the second purchase price installment date, the buyer will pay $9.4 million. The second purchase price installment is due on (a) January 31, 2020, in the event that the tenant at the Marine Piers does not exercise its existing option to extend the term of the sublease or (b) January 15, 2024, in the event that the tenant does exercise its current extension option to extend the term of the sublease. In accordance with ASC 360-20, Real Estate Sales, the Company determined that it is appropriate to account for the sales transaction under the cost recovery method. The Company received cash proceeds of $11.2 million, after closing costs and prorations, and the net book value of the Marine Piers was $4.7 million, resulting in a gain on sale of $6.5 million. The remaining gain on sale of $9.4 million will be recognized on the second purchase price installment date. The Marine Piers was classified as mixed-use within our property count.

(d)	During the fourth quarter of 2016, the Company recognized a $3.0 million impairment related to these properties. During the first quarter of 2017, there was a price reduction of $1.7 million under the agreement of sale and an additional impairment of $1.7 million was recognized.

(e)

This sale is designated as a like-kind exchange under Section 1031 of the Internal Revenue Code (“IRC”) and, as such, the proceeds, totaling $32.0 million after closing costs and prorations, were deposited with a Qualified Intermediary, as defined under the IRC. The proceeds received at closing were recorded as “Other assets” in the Company’s consolidated balance sheet as of March 31, 2017. During the fourth quarter of 2016, the Company recognized a $11.5 million impairment related to these properties.

In addition to the amounts in the table above, the Company recorded $0.5 million gain during the first quarter of 2017 from the receipt of additional cash from the disposition of Cira Square during 2016. For further information relating to this sale, see Note 3, “Real Estate Investments,” in the notes to the audited financial statements included in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2016.

The Company sold the following land parcels during the three-month period ended March 31, 2017 (dollars in thousands):

Disposition Date	Property/Portfolio Name	Location	Number of Parcels		Acres		Sales Price		Net Proceeds on Sale		Gain on Sale
February 15, 2017	Gateway Land C	Richmond, VA		1		4.8	$	1,100	$	1,043	$	-	(a)
January 30, 2017	Garza Ranch	Austin, TX		1		1.7		3,500		3,277		-	(b)
Total Dispositions				2		6.5	$	4,600	$	4,320	$	-

(a)	During the fourth quarter of 2016, the Company recognized a nominal impairment related to this land parcel.

(b)

The Company has a continuing involvement through a completion guaranty, which requires the Company as developer to complete certain infrastructure improvements on behalf of the buyers of the land parcels. The cash received at settlement was recorded as “Deferred income, gains and rent” on the Company’s consolidated balance sheet and the Company will recognize the sale once the infrastructure improvements are complete. See Item 2., “Management’s Discussion and Analysis of Financial Condition and Results of Operations – Contractual Obligations” for further discussion of the infrastructure improvements.

The sales of the properties and land referenced above do not represent a strategic shift that has a major effect on the Company's operations and financial results. Accordingly, the operating results of these properties remain classified within continuing operations for all periods presented.

Held for Sale

The following is a summary of one property classified as held for sale but which did not meet the criteria to be classified within discontinued operations at March 31, 2017 (in thousands):

	Held for Sale Property Included in Continuing Operations
	March 31, 2017
	Other Segment - Retail
ASSETS HELD FOR SALE
Real estate investments:
Operating properties	$	5,576
Accumulated depreciation		(79	)
Operating real estate investments, net		5,497
Land held for development		-
Total real estate investments, net		5,497
Other assets		765
Total assets held for sale, net	$	6,262

LIABILITIES HELD FOR SALE
Other liabilities	$	387
Total liabilities held for sale	$	387

As the fair value less anticipated costs to sell exceeded the carrying value for the property included in the above table, no provision for impairment was recorded. The fair value measurement is based on pricing in the purchase and sale agreement for the property. As the pricing in the purchase and sale agreement is unobservable, the Company determined that the input utilized to determine fair value for the property falls within Level 3 in accordance with the fair value hierarchy established by Accounting Standards Codification (ASC) Topic 820, “Fair Value Measurements and Disclosures”.

The sale of the held for sale property does not represent a strategic shift that has a major effect on the Company's operations and financial results. As a result, the operating results of the property remains classified within continuing operations for all periods presented.

Held for Use Impairment

As of March 31, 2017, the Company evaluated the recoverability of the carrying value of its properties that triggered assessment under the undiscounted cash flow model. Based on the Company’s evaluation, it was determined that due to the reduction in the Company’s intended hold period of four properties located in the Other segment, the Company would not recover the carrying values of these properties. Accordingly, the Company recorded impairment charges on these properties of $1.0 million at March 31, 2017, reducing the aggregate carrying values of the properties from $10.2 million to their estimated fair value of $9.2 million. The Company measured these impairments based on a discounted cash flow analysis, using a hold period of 10 years and residual capitalization rates and discount rates of 9.00% and 9.25%, respectively. The results were comparable to indicative pricing in the market. The assumptions used to determine fair value under the income approach are Level 3 inputs in accordance with the fair value hierarchy established by Accounting Standards Codification (ASC) Topic 820, “Fair Value Measurements and Disclosures.”

- Definition

The entire disclosure for certain real estate investment financial statements, real estate investment trust operating support agreements, real estate owned, retail land sales, time share transactions, as well as other real estate related disclosures.

+ References + Details

Investment in Unconsolidated Real Estate Ventures

3 Months Ended

Mar. 31, 2017

Equity Method Investments And Joint Ventures [Abstract]

INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES

4. INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES

As of March 31, 2017, the Company held ownership interests in 13 unconsolidated Real Estate Ventures for an aggregate investment balance of $264.9 million. The Company formed or acquired interests in these Real Estate Ventures with unaffiliated third parties to develop or manage office, residential, and/or mixed-use properties or to acquire land in anticipation of possible development of office, residential and/or mixed-use properties. As of March 31, 2017, seven of the real estate ventures owned properties that contain an aggregate of approximately 8.0 million net rentable square feet of office space; two real estate ventures owned 4.3 acres of undeveloped parcels of land; two real estate ventures owned 1.4 acres of land under active development and two real estate ventures owned residential towers that contain 345 and 321 apartment units, respectively.

The Company accounts for its unconsolidated interests in the Real Estate Ventures using the equity method. The Company’s unconsolidated interests range from 20% to 70%, subject to specified priority allocations of distributable cash in certain of the Real Estate Ventures.

The Company earned management fees from its Real Estate Ventures of $1.5 million in each of the three-month periods ended March 31, 2017 and 2016. The Company has outstanding accounts receivable balances from its Real Estate Ventures of $1.6 million and $1.4 million as of March 31, 2017 and December 31, 2016, respectively.

The amounts reflected in the following tables (except for the Company’s share of equity and income) are based on the financial information of the individual Real Estate Ventures. The Company does not record operating losses of a Real Estate Venture in excess of its investment balance unless the Company is liable for the obligations of the Real Estate Venture or is otherwise committed to provide financial support to the Real Estate Venture.

The following is a summary of the financial position of the Real Estate Ventures in which the Company held interests as of March 31, 2017 and December 31, 2016 (in thousands):

	March 31, 2017		December 31, 2016
Net property	$	1,405,986	$	1,483,067
Other assets		210,032		231,972
Other liabilities		107,161		129,486
Debt, net		946,891		989,738
Equity		561,966		595,815

Company’s share of equity (Company’s basis) (a)	$	264,941	$	281,331

(a)

This amount includes the effect of the basis difference between the Company's historical cost basis and the basis recorded at the Real Estate Venture level, which is typically amortized over the life of the related assets and liabilities. Basis differentials occur from the impairment of investments, purchases of third party interests in existing Real Estate Ventures and upon the transfer of assets that were previously owned by the Company into a Real Estate Venture. In addition, certain acquisition, transaction and other costs may not be reflected in the net assets at the Real Estate Venture level.

The following is a summary of results of operations of the Real Estate Ventures in which the Company held interests during the three-month periods ended March 31, 2017 and 2016 (in thousands):

	Three-month periods ended March 31,
	2017			2016
Revenue	$	54,279		$	46,525
Operating expenses		(25,166	)		(26,668	)
Interest expense, net		(10,830	)		(8,989	)
Depreciation and amortization		(20,761	)		(20,160	)
Net loss (a)	$	(2,478	)	$	(9,292	)

Equity in loss of Real Estate Ventures	$	(748	)	$	(403	)

(a)	The three-month period ended March 31, 2016 amount includes $6.4 million of acquisition deal costs related to the formation of the MAP Venture during the three-month period ended March 31, 2016.

The Parc at Plymouth Meeting Venture

On January 31, 2017, the Company sold its 50% interest in TB-BDN Plymouth Apartments, L.P., a 50/50 real estate venture with Toll Brothers, at a gross sales value of $100.5 million, of which the Company was allocated 50% for its interest. The venture developed and operates a 398-unit multi-family complex in Plymouth Meeting, Pennsylvania encumbered by a $54.0 million construction loan. The construction loan was repaid commensurate with the sale of the Company’s 50% interest. As a result, the Company is no longer subject to a $3.2 million payment guarantee on the construction loan. The cash proceeds, after the payment of the Company’s share of the debt and closing costs, were $27.2 million. The carrying amount of the Company’s investment at the time of sale was $12.6 million, resulting in a $14.6 million gain on sale of interest in the real estate venture.

Guarantees

As of March 31, 2017, the Company’s unconsolidated real estate ventures had aggregate indebtedness to third parties of $953.8 million. These loans are generally mortgage or construction loans, most of which are non-recourse to the Company. As of March 31, 2017, the loans for which there is recourse to the Company consists of the following: (i) a $55.4 million payment guaranty on the term loan for evo at Cira; (ii) a joint and several cost overrun guaranty on the $88.9 million construction loan for the development project being undertaken by 1919 Market Street LP; and (iii) a $0.4 million payment guarantee on a loan provided to PJP VII. In addition, during construction undertaken by real estate ventures, the Company has provided and expects to continue to provide cost overrun and completion guarantees, with rights of contribution among partners or members in the real estate ventures, as well as customary environmental indemnities and guarantees of customary exceptions to nonrecourse provisions in loan agreements. For additional information regarding these real estate ventures, included their indebtedness, see Note 4, "Investment in Unconsolidated Real Estate Ventures," in the notes to the audited financial statements included in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2016.

Intangible Assets and Liabilities

3 Months Ended

Mar. 31, 2017

Goodwill And Intangible Assets Disclosure [Abstract]

INTANGIBLE ASSETS AND LIABILITIES

5. INTANGIBLE ASSETS AND LIABILITIES

As of March 31, 2017 and December 31, 2016, the Company’s intangible assets/liabilities were comprised of the following (in thousands):

	March 31, 2017
	Total Cost		Accumulated Amortization			Intangible Assets, net
Intangible assets, net:
In-place lease value	$	114,196	$	(54,834	)	$	59,362
Tenant relationship value		13,036		(10,378	)		2,658
Above market leases acquired		4,703		(2,501	)		2,202
Total intangible assets, net	$	131,935	$	(67,713	)	$	64,222

Acquired lease intangibles, net:
Below market leases acquired	$	30,683	$	(14,079	)	$	16,604

	December 31, 2016
	Total Cost		Accumulated Amortization			Intangible Assets, net
Intangible assets, net:
In-place lease value	$	142,889	$	(75,696	)	$	67,193
Tenant relationship value		13,074		(10,167	)		2,907
Above market leases acquired		4,718		(2,340	)		2,378
Total intangible assets, net	$	160,681	$	(88,203	)	$	72,478

Acquired lease intangibles, net:
Below market leases acquired	$	37,579	$	(19,460	)	$	18,119

As of March 31, 2017, the Company’s annual amortization for its intangible assets/liabilities, assuming no prospective early lease terminations, are as follows (dollars in thousands):

	Assets		Liabilities
2017 (nine months remaining)	$	11,409	$	1,809
2018		11,754		2,196
2019		10,536		1,885
2020		8,457		1,337
2021		5,971		807
Thereafter		16,095		8,570
Total	$	64,222	$	16,604

Debt Obligations

3 Months Ended

Mar. 31, 2017

Debt Disclosure [Abstract]

DEBT OBLIGATIONS

6. DEBT OBLIGATIONS

The following table sets forth information regarding the Company’s consolidated debt obligations outstanding at March 31, 2017 and December 31, 2016 (in thousands):

	March 31, 2017			December 31, 2016			Effective Interest Rate				Maturity Date
MORTGAGE DEBT:

Two Logan Square	$	85,625		$	86,012			3.98	%		May 2020
One Commerce Square		126,198			127,026			3.64	%	(a)	Apr 2023
Two Commerce Square		112,000			112,000			4.51	%	(b)	Apr 2023
Principal balance outstanding		323,823			325,038
Plus: fair market value premium (discount), net		(2,652	)		(2,761	)
Less: deferred financing costs		(687	)		(728	)
Mortgage indebtedness	$	320,484		$	321,549

UNSECURED DEBT
Seven-Year Term Loan - Swapped to fixed	$	250,000		$	250,000			3.72	%		Oct 2022
$300.0M 5.70% Guaranteed Notes due 2017		300,000			300,000			5.68	%		May 2017
$325.0M 4.95% Guaranteed Notes due 2018		325,000			325,000			5.13	%		Apr 2018
$250.0M 3.95% Guaranteed Notes due 2023		250,000			250,000			4.02	%		Feb 2023
$250.0M 4.10% Guaranteed Notes due 2024		250,000			250,000			4.33	%		Oct 2024
$250.0M 4.55% Guaranteed Notes due 2029		250,000			250,000			4.60	%		Oct 2029
Indenture IA (Preferred Trust I)		27,062			27,062			2.75	%		Mar 2035
Indenture IB (Preferred Trust I)		25,774			25,774			3.30	%		Apr 2035
Indenture II (Preferred Trust II)		25,774			25,774			3.09	%		Jul 2035
Principal balance outstanding		1,703,610			1,703,610
Plus: original issue premium (discount), net		(4,424	)		(4,678	)
Less: deferred financing costs		(6,999	)		(7,369	)
Total unsecured indebtedness	$	1,692,187		$	1,691,563
Total Debt Obligations	$	2,012,671		$	2,013,112

(a)

This loan was assumed upon acquisition of the related properties on December 19, 2013. On December 29, 2015, the Company refinanced the debt increasing the principal balance to $130.0 million and extended the term of the scheduled maturity from January 6, 2016 to April 5, 2023. The effective interest rate as of December 31, 2015 was 3.64%. A default under this loan will also constitute a default under the loan outstanding on Two Commerce Square. This loan is also secured by a lien on Two Commerce Square.

(b)

This loan was assumed upon acquisition of the related property on December 19, 2013. The interest rate reflects the market rate at the time of acquisition. A default under this loan will also constitute a default under the loan outstanding on One Commerce Square. This loan is also secured by a lien on One Commerce Square.

As of March 31, 2017 and December 31, 2016, the Company’s weighted-average effective interest rates on its mortgage notes payable were both 4.03%. As of March 31, 2017 and December 31, 2016, the net carrying value of the Company’s Properties that are encumbered by mortgage indebtedness was $323.8 million and $325.0 million, respectively.

On May 15, 2015, the Company closed on a new four-year unsecured revolving credit facility that provides for borrowings of up to $600.0 million. The Company had no borrowings under its unsecured revolving credit facility as of and during either of the three-month periods ended March 31, 2017 and March 31, 2016.

The Parent Company unconditionally guarantees the unsecured debt obligations of the Operating Partnership (or is a co-borrower with the Operating Partnership) but does not by itself incur unsecured indebtedness. The Parent Company has no material assets other than its investment in the Operating Partnership.

The Company was in compliance with all financial covenants as of March 31, 2017. Management continuously monitors the Company’s compliance with and anticipated compliance with the covenants. Certain of the covenants restrict the Company’s ability to obtain alternative sources of capital. While the Company currently believes it will remain in compliance with its covenants, in the event that the economy deteriorates in the future, the Company may not be able to remain in compliance with such covenants, in which case a default would result absent a lender waiver.

Fair Value of Financial Instruments

3 Months Ended

Mar. 31, 2017

Fair Value Disclosures [Abstract]

FAIR VALUE OF FINANCIAL INSTRUMENTS

7. FAIR VALUE OF FINANCIAL INSTRUMENTS

Financial assets and liabilities recorded on the consolidated balance sheets are categorized based on the inputs to the valuation techniques as follows:

	•	Level 1 inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities that the Company has the ability to access;
	•	Level 2 inputs are inputs, other than quoted prices included in Level 1, which are observable for the asset or liability, either directly or indirectly. Level 2 inputs may include quoted prices for similar assets and liabilities in active markets, as well as inputs that are observable for the asset or liability (other than quoted prices), such as interest rates, foreign exchange rates, and yield curves that are observable at commonly quoted intervals; and
	•	Level 3 inputs are unobservable inputs for the asset or liability, which is typically based on an entity’s own assumptions, as there is little, if any, related market activity or information.

The Company determined the fair values disclosed below using available market information and discounted cash flow analyses as of March 31, 2017 and December 31, 2016, respectively. The discount rate used in calculating fair value is the sum of the current risk free rate and the risk premium on the date of measurement of the instruments or obligations. Considerable judgment is necessary to interpret market data and to develop the related estimates of fair value. Accordingly, the estimates presented are not necessarily indicative of the amounts that the Company could realize upon disposition. The use of different estimates and valuation methodologies may have a material effect on the fair value amounts shown. The Company believes that the carrying amounts reflected in the consolidated balance sheets at March 31, 2017 and December 31, 2016 approximate the fair values for cash and cash equivalents, accounts receivable, other assets (except for the note receivable disclosed below), accounts payable and accrued expenses. The following are financial instruments for which the Company’s estimates of fair value differ from the carrying amounts (in thousands):

	March 31, 2017				December 31, 2016
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Unsecured notes payable	$	1,365,398	$	1,381,975	$	1,364,854	$	1,372,758
Variable rate debt	$	326,789	$	307,917	$	326,709	$	307,510
Mortgage notes payable	$	320,484	$	327,144	$	321,549	$	328,853
Note receivable (a)	$	3,401	$	3,918	$	3,380	$	3,717

(a)

The inputs to originate the loan are unobservable and, as a result, are categorized as Level 3. The Company determined fair value by calculating the present value of the cash payments to be received through the maturity date of the loan. See Note 2, “Summary of Significant Accounting Policies,” to the Company’s 2016 Annual Report on Form 10-K for the year ended December 31, 2016 for further information regarding the note origination.

The inputs utilized to determine the fair value of the Company’s unsecured notes payable are categorized as Level 2. This is because the Company valued these instruments using quoted market prices as of March 31, 2017 and December 31, 2016. For the fair value of the Company’s unsecured notes, the Company uses a discount rate based on the indicative new issue pricing provided by lenders.

The inputs utilized to determine the fair value of the Company’s mortgage notes payable and variable rate debt are categorized as Level 3. The fair value of the variable rate debt was estimated using a discounted cash flow analysis valuation on the borrowing rates currently available to the Company for loans with similar terms and maturities, as applicable. The fair value of the mortgage debt was determined by discounting the future contractual interest and principal payments by a blended market rate for loans with similar terms, maturities and loan-to-value. These inputs have been categorized as Level 3 because the Company considers the rates used in the valuation techniques to be unobservable inputs.

For the Company’s mortgage loans, the Company uses an estimate based discounted cash flow analyses and its knowledge of the mortgage market. The weighted average discount rate for the combined variable rate debt and mortgage loans used to calculate fair value as of March 31, 2017 and December 31, 2016 was 4.507% and 4.353%, respectively. An increase in the discount rate used in the discounted cash flow model would result in a decrease to the fair value of the Company’s long-term debt. Conversely, a decrease in the discount rate used in the discounted cash flow model would result in an increase to the fair value of the Company’s long-term debt.

Disclosure about the fair value of financial instruments is based upon pertinent information available to management as of March 31, 2017 and December 31, 2016. Although management is not aware of any factors that would significantly affect the fair value amounts, such amounts have not been comprehensively revalued for purposes of these financial statements since March 31, 2017, and current estimates of fair value may differ from the amounts presented herein.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Limited Partners' Non-Controlling Interests in the Parent Company	3 Months Ended
	Mar. 31, 2017
Noncontrolling Interest [Abstract]
LIMITED PARTNERS' NON-CONTROLLING INTERESTS IN THE PARENT COMPANY	8. LIMITED PARTNERS' NON-CONTROLLING INTERESTS IN THE PARENT COMPANY Non-controlling interests in the Parent Company’s financial statements relate to redeemable common limited partnership interests in the Operating Partnership held by parties other than the Parent Company and properties which are consolidated but not wholly owned. Operating Partnership The aggregate book value of the non-controlling interests associated with the redeemable common limited partnership interests in the accompanying consolidated balance sheet of the Parent Company was $14.9 million at each of March 31, 2017 and December 31, 2016, respectively. Under the applicable accounting guidance, the redemption value of limited partnership units are carried at, on a limited partner basis, the greater of historical cost adjusted for the allocation of income and distributions or fair value. The Parent Company believes that the aggregate settlement value of these interests based on the number of units outstanding and the closing price of the common shares on the balance sheet dates as of March 31, 2017 and December 31, 2016 was approximately $24.0 million and $24.4 million, respectively.

Fair Value of Derivative Financial Instruments

3 Months Ended

Mar. 31, 2017

Derivative Instruments And Hedging Activities Disclosure [Abstract]

FAIR VALUE OF DERIVATIVE FINANCIAL INSTRUMENTS

9. FAIR VALUE OF DERIVATIVE FINANCIAL INSTRUMENTS

The following table summarizes the terms and fair values of the Company’s derivative financial instruments as of March 31, 2017 and December 31, 2016. The notional amounts provide an indication of the extent of the Company’s involvement in these instruments at that time, but do not represent exposure to credit, interest rate or market risks (amounts presented in thousands and included in other assets and other liabilities on the Company’s consolidated balance sheets).

Hedge Product	Hedge Type	Designation		Notional Amount				Strike			Trade Date	Maturity Date	Fair value
				3/31/2017		12/31/2016							3/31/2017			12/31/2016
Assets
Swap	Interest Rate	Cash Flow	(a)	$	250,000	$	250,000		3.718	%	October 8, 2015	October 8, 2022	$	4,572		$	3,733

Liabilities
Swap	Interest Rate	Cash Flow	(a)		25,774		25,774		3.300	%	December 22, 2011	January 30, 2021		(169	)		(300	)
Swap	Interest Rate	Cash Flow	(a)		25,774		25,774		3.090	%	January 6, 2012	October 30, 2019		(93	)		(214	)
Swap	Interest Rate	Cash Flow	(a)		27,062		27,062		2.750	%	December 21, 2011	September 30, 2017		(37	)		(83	)
				$	328,610	$	328,610

(a)	Hedging unsecured variable rate debt.

The Company measures its derivative instruments at fair value and records them gross in the consolidated balance sheet in other assets or other liabilities. Additionally, the Company recorded its share of the fair value of derivative financial instruments held by its unconsolidated real estate ventures, as of March 31, 2017.

Although the Company has determined that the majority of the inputs used to value its derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by itself and its counterparties. The Company has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and has determined that the credit valuation adjustments are not significant to the overall valuation of its derivatives. As a result, the Company has determined that its derivative valuations in their entirety are classified in Level 2 of the fair value hierarchy.

- Definition

The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts.

+ References

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+ Details

Beneficiaries Equity of the Parent Company

3 Months Ended

Mar. 31, 2017

Equity [Abstract]

BENEFICIARIES' EQUITY OF THE PARENT COMPANY

10. BENEFICIARIES’ EQUITY OF THE PARENT COMPANY

Earnings per Share (EPS)

The following tables detail the number of shares and net income used to calculate basic and diluted earnings per share (in thousands, except share and per share amounts; results may not add due to rounding):

	Three-month periods ended March 31,
	2017						2016
	Basic			Diluted			Basic			Diluted
Numerator
Income from continuing operations	$	21,271		$	21,271		$	46,310		$	46,310
Net income from continuing operations attributable to non-controlling interests		(169	)		(169	)		(389	)		(389	)
Nonforfeitable dividends allocated to unvested restricted shareholders		(99	)		(99	)		(105	)		(105	)
Preferred share dividends		(1,725	)		(1,725	)		(1,725	)		(1,725	)
Net income attributable to common shareholders	$	19,278		$	19,278		$	44,091		$	44,091
Denominator
Weighted-average shares outstanding		175,176,964			175,176,964			174,788,945			174,788,945
Contingent securities/Share based compensation		-			1,024,908			-			682,468
Weighted-average shares outstanding		175,176,964			176,201,872			174,788,945			175,471,413
Earnings per Common Share:
Net income attributable to common shareholders	$	0.11		$	0.11		$	0.25		$	0.25

Redeemable common limited partnership units totaling 1,479,799 and 1,535,102 in March 31, 2017 and March 31, 2016, respectively, were excluded from the diluted earnings per share computations because they are not dilutive.

Unvested restricted shares are considered participating securities which require the use of the two-class method for the computation of basic and diluted earnings per share. For the three-month periods ended March 31, 2017 and 2016, earnings representing nonforfeitable dividends as noted in the table above were allocated to the unvested restricted shares issued to the Company’s executives and other employees under the Company's shareholder-approved long-term incentive plan.

Common and Preferred Shares

On March 1, 2017, the Parent Company declared a distribution of $0.16 per common share, totaling $28.3 million, which was paid on April 19, 2017 to shareholders of record as of April 5, 2017. In addition, the Parent Company declared distributions on its 6.90% Series E Cumulative Redeemable Preferred Shares (NYSE: BDN-PE) (the “Series E Preferred Shares”) to holders of record as of March 30, 2017. These shares are entitled to a preferential return of 6.90% per annum on the $25.00 per share liquidation preference. Distributions paid on April 17, 2017 to holders of Series E Preferred Shares totaled $1.7 million.

On March 10, 2017, the Parent Company announced its intention to redeem all of its outstanding 4,000,000 Series E Preferred Shares on April 11, 2017. The Series E Preferred Shares were redeemed in full on April 11, 2017 at a redemption price of $25.00 per share with cash from existing cash balances on hand. See Note 15, “Subsequent Events.”

Partners Equity of The Operating Partnership

3 Months Ended

Mar. 31, 2017

Equity [Abstract]

PARTNERS' EQUITY OF THE OPERATING PARTNERSHIP

11. PARTNERS’ EQUITY OF THE OPERATING PARTNERSHIP

Earnings per Common Partnership Unit

The following tables detail the number of units and net income used to calculate basic and diluted earnings per common partnership unit (in thousands, except unit and per unit amounts; results may not add due to rounding):

	Three-month periods ended March 31,
	2017						2016
	Basic			Diluted			Basic			Diluted
Numerator
Income from continuing operations	$	21,271		$	21,271		$	46,310		$	46,310
Nonforfeitable dividends allocated to unvested restricted unitholders		(99	)		(99	)		(105	)		(105	)
Preferred unit dividends		(1,725	)		(1,725	)		(1,725	)		(1,725	)
Net income attributable to non-controlling interests		(5	)		(5	)		(2	)		(2	)
Net income attributable to common unitholders	$	19,442		$	19,442		$	44,478		$	44,478
Denominator
Weighted-average units outstanding		176,656,763			176,656,763			176,324,047			176,324,047
Contingent securities/Share based compensation		-			1,024,908			-			682,468
Total weighted-average units outstanding		176,656,763			177,681,671			176,324,047			177,006,515
Earnings per Common Partnership Unit:
Net income attributable to common unitholders	$	0.11		$	0.11		$	0.25		$	0.25

Unvested restricted units are considered participating securities which require the use of the two-class method for the computation of basic and diluted earnings per share. For the three-month periods ended March 31, 2017 and 2016, earnings representing nonforfeitable dividends as noted in the table above were allocated to the unvested restricted units issued to the Parent Company in connection with awards to the Parent Company’s executives and other employees under the Parent Company's shareholder-approved long-term incentive plan.

Common Partnership Units and Preferred Mirror Units

On March 1, 2017, the Operating Partnership declared a distribution of $0.16 per common partnership unit, totaling $28.3 million, which was paid on April 19, 2017 to unitholders of record as of April 5, 2017. In addition, the Operating Partnership declared distributions on its Series E-Linked Preferred Mirror Units to holders of record as of March 30, 2017. These units are entitled to a preferential return of 6.90% per annum on the $25.00 per unit liquidation preference. Distributions paid on April 17, 2017 to holders of Series E-Linked Preferred Mirror Units totaled $1.7 million.

On March 10, 2017, the Parent Company announced its intention to redeem all of its outstanding 4,000,000 Series E Preferred Shares on April 11, 2017. In connection with the redemption, on April 11, 2017, the Operating Partnership redeemed all of its Series E-Linked Preferred Mirror Units at a redemption price of $25.00 per unit with cash from existing cash balances on hand. See Note 15, “Subsequent Events.”

Share Based Compensation, 401(k) Plan and Deferred Compensation

3 Months Ended

Mar. 31, 2017

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

SHARE BASED COMPENSATION, 401(k) PLAN AND DEFERRED COMPENSATION

12. SHARE BASED COMPENSATION, 401(k) PLAN AND DEFERRED COMPENSATION

Restricted Share Awards

As of March 31, 2017, 618,961 restricted shares were outstanding under the Equity Incentive Plan and vest over three years from the initial grant dates. The remaining compensation expense to be recognized at March 31, 2017 was approximately $2.9 million, and is expected to be recognized over a weighted average remaining vesting period of 1.5 years. During the three-month periods ended March 31, 2017 and 2016, the Company recognized compensation expense related to outstanding restricted shares of $1.5 million and $1.2 million, respectively, of which $0.3 million and $0.3 million, respectively, were capitalized as part of the Company’s review of employee salaries eligible for capitalization.

The following table summarizes the Company’s restricted share activity during the three months ended March 31, 2017:

	Shares			Weighted Average Grant Date Fair Value		Aggregate Intrinsic Value
Non-vested at January 1, 2017		488,604		$	14.10	$	8,066,852
Granted		141,751			16.68		2,364,127
Vested		(9,394	)		14.90		153,216
Forfeited		(2,000	)		13.58
Non-vested at March 31, 2017		618,961		$	14.68	$	10,045,737

On March 1, 2017, the Compensation Committee of the Parent Company’s Board of Trustees awarded to officers of the Company an aggregate 109,629 restricted common shares, which cliff vest on April 15, 2020. In addition, on March 7, 2017, the Compensation Committee awarded non-officer employees an aggregate 32,122 restricted common shares, which vest in two equal annual installments on April 15 of 2018 and 2019. Vesting of restricted common shares is subject to acceleration upon certain events, including if the recipient of the award were to die, become disabled or, in certain cases, retire in a qualifying retirement. Qualifying retirement generally means the recipient’s voluntary termination of employment after reaching at least age 57 and accumulating at least 15 years of service with the Company. In addition, in the case of the Company’s President and Chief Executive Officer, vesting would also accelerate if the Company were to terminate him without cause, or if he were to resign for good reason under his employment agreement. In addition, if the Company were to undergo a change of control, then unvested shares would also accelerate if, in connection with the change of control or within a specified period after the change of control, the holder’s employment were to terminate in a qualifying termination or resignation. In accordance with the accounting standard for share-based compensation, the Company amortizes share-based compensation costs through the qualifying retirement dates for those executives who meet the conditions for qualifying retirement during the scheduled vesting period and whose award agreements provide for vesting upon a qualifying retirement.

Restricted Performance Share Units Plan

The Compensation Committee of the Parent Company’s Board of Trustees has granted performance share-based awards (referred to as Restricted Performance Share Units, or RPSUs) to officers of the Parent Company. The RPSUs are settled in common shares, with the number of common shares issuable in settlement determined based on the Company’s total shareholder return over specified measurement periods compared to total shareholder returns of comparative groups over the measurement periods. The table below presents certain information as to unvested RPSU awards.

	RPSU Grant
	2/23/2015		2/22/2016		3/1/2017		Total

(Amounts below in shares, unless otherwise noted)
Non-vested at January 1, 2017		147,589		231,388		-		378,977
Units Granted		-		-		174,854		174,854
Units Cancelled		-		-		-		-
Non-vested at March 31, 2017		147,589		231,388		174,854		553,831

Measurement Period Commencement Date	1/1/2015		1/1/2016		1/1/2017
Measurement Period End Date	12/31/2017		12/31/2018		12/31/2019
Units Granted		186,395		231,388		174,854
Fair Value of Units on Grant Date (in thousands)	$	3,933	$	3,558	$	3,735

The Company values each RPSU on its grant date using a Monte Carlo simulation. The fair values of each award are being amortized over the three year cliff vesting period. The vesting of RPSUs is subject to acceleration upon a change in control or if the recipient of the award were to die, become disabled or retire in a qualifying retirement prior to the vesting date. In accordance with the accounting standard for share-based compensation, the Company amortizes stock-based compensation costs through the qualifying retirement date for those executives who meet the conditions for qualifying retirement during the schedule vesting period.

For the three months ended March 31, 2017, the Company recognized total compensation expense for the 2017, 2016 and 2015 RPSU awards of $2.4 million, of which $0.5 million was capitalized consistent with the Company’s policies for capitalizing eligible portions of employee compensation. For the three months ended March 31, 2016, the Company recognized total compensation expense for the 2016, 2015 and 2014 RPSU awards of $1.7 million, of which $0.5 million was capitalized consistent with the Company’s policies for capitalizing eligible portions of employee compensation.

The remaining compensation expense to be recognized at March 31, 2017 was approximately $2.9 million, and is expected to be recognized over a weighted average remaining vesting period of 1.9 years.

The Company issued 55,299 common shares on February 1, 2017 in settlement of RPSUs that had been awarded on March 11, 2014 and 12, 2014 (with a three-year measurement period ended December 31, 2016). Holders of these RPSUs also received a cash dividend of $0.16 per share for these common shares on February 6, 2017.

- Definition

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

+ References + Details

Segment Information

3 Months Ended

Mar. 31, 2017

Segment Reporting [Abstract]

SEGMENT INFORMATION

13. SEGMENT INFORMATION

As of March 31, 2017, the Company managed its portfolio within five segments: (1) Philadelphia Central Business District (CBD), (2) Pennsylvania Suburbs, (3) Metropolitan Washington, D.C., (4) Austin, Texas and (5) Other. The Philadelphia CBD segment includes properties located in the City of Philadelphia in Pennsylvania. The Pennsylvania Suburbs segment includes properties in Chester, Delaware, and Montgomery counties in the Philadelphia suburbs. The Metropolitan Washington, D.C. segment includes properties in the District of Columbia, Northern Virginia and southern Maryland. The Austin, Texas segment includes properties in the City of Austin, Texas. The Other segment includes properties located in New Jersey/Delaware. On February 2, 2017, the Company sold its last two remaining properties located in California, which were previously included in the Other segment. See Note 3, “Real Estate Investments,” for further information. The corporate group is responsible for cash and investment management, development of certain real estate properties during the construction period, and certain other general support functions. Land held for development and construction in progress are transferred to operating properties by region upon completion of the associated construction or project.

The following tables provide selected asset information and results of operations of the Company's reportable segments (in thousands):

Real estate investments, at cost:
	March 31, 2017		December 31, 2016
Philadelphia CBD	$	1,471,258	$	1,320,974
Pennsylvania Suburbs		1,006,780		1,005,446
Metropolitan Washington, D.C.		974,838		975,987
Austin, Texas		146,858		146,794
Other		102,470		137,094
	$	3,702,204	$	3,586,295
Assets held for sale (a)		5,576		73,591
Operating Properties	$	3,707,780	$	3,659,886

Corporate
Construction-in-progress	$	166,372	$	297,462
Land held for development	$	153,268	$	150,970

(a)	As of March 31, 2017, the Company categorized a retail property located in the Other segment as held for sale in accordance with applicable accounting standards for long lived assets. See Note 3, “Real Estate Investments,” for further information.

None of the above aforementioned sales or properties classified as held for sale are considered significant dispositions under the accounting guidance for discontinued operations.

Net operating income (in thousands):

	Three-month periods ended
	March 31,
	2017							2016
	Total revenue		Operating expenses (a)			Net operating income		Total revenue		Operating expenses (a)			Net operating income
Philadelphia CBD	$	54,449	$	(20,837	)	$	33,612	$	49,670	$	(19,256	)	$	30,414
Pennsylvania Suburbs		35,655		(12,584	)		23,071		37,106		(13,155	)		23,951
Metropolitan Washington, D.C.		23,362		(9,383	)		13,979		27,339		(10,899	)		16,440
Austin, Texas		9,123		(3,573	)		5,550		8,547		(3,255	)		5,292
Other		6,362		(3,856	)		2,506		12,740		(7,602	)		5,138
Corporate		1,969		(848	)		1,121		1,100		(608	)		492
Operating Properties	$	130,920	$	(51,081	)	$	79,839	$	136,502	$	(54,775	)	$	81,727

(a)	Includes property operating expense, real estate taxes and third party management expense.

Unconsolidated real estate ventures (in thousands):
	Investment in real estate ventures, at equity				Equity in loss of real estate ventures
	As of				Three-month periods ended March 31,
	March 31, 2017		December 31, 2016		2017			2016
Philadelphia CBD	$	44,618	$	48,691	$	(67	)	$	455
Pennsylvania Suburbs		3,147		15,421		276			265
Metropolitan Washington, D.C.		143,591		141,786		467			(448	)
MAP Venture (a)		17,776		20,893		(1,117	)		(556	)
Other		1,713		1,654		58			161
Austin, Texas		54,096		52,886		(365	)		(280	)
Total	$	264,941	$	281,331	$	(748	)	$	(403	)

(a)

The MAP Venture represents a joint venture formed between the Company and MAP Ground Lease Holdings LLC, an affiliate of Och-Ziff Capital Management Group, LLC, on February 4, 2016. The MAP Venture’s business operations, including properties in Richmond, Virginia; Metropolitan Washington, D.C.; New Jersey/Delaware and Pennsylvania Suburbs, are centrally managed with the results reported to management of the Company on a consolidated basis. As a result, the investment in the MAP Venture is separately presented. All other unconsolidated real estate ventures are managed consistently with the Company’s regional segments.

Net operating income (“NOI”) is a non-GAAP financial measure defined as total revenue less property operating expenses, real estate taxes and third party management expenses. Property operating expenses that are included in determining NOI consist of costs that are necessary and allocable to our operating properties such as utilities, property-level salaries, repairs and maintenance, property insurance, management fees and bad debt expense. General and administrative expenses that are not reflected in NOI primarily consist of corporate-level salaries, amortization of share awards and professional fees that are incurred as part of corporate office management. All companies may not calculate NOI in the same manner. NOI is the measure that is used by the Company to evaluate the operating performance of its real estate assets by segment. The Company believes NOI provides useful information to investors regarding the financial condition and results of operations because it reflects only those income and expense items that are incurred at the property level. While NOI is a relevant and widely used measure of operating performance of real estate investment trusts, it does not represent cash flow from operations or net income as defined by GAAP and should not be considered as an alternative to those measures in evaluating our liquidity or operating performance. NOI does not reflect interest expenses, real estate impairment losses, depreciation and amortization costs, capital expenditures and leasing costs. The Company believes that net income, as defined by GAAP, is the most appropriate earnings measure. The following is a reconciliation of consolidated NOI to consolidated net income, as defined by GAAP (in thousands):

	Three-month periods ended March 31,
	2017			2016

Consolidated net operating income	$	79,839		$	81,727
Less:
Interest expense		(21,437	)		(23,691	)
Interest expense - amortization of deferred financing costs		(634	)		(774	)
Interest expense - financing obligation		-			(281	)
Depreciation and amortization		(45,892	)		(48,873	)
General and administrative expenses		(9,425	)		(9,120	)
Equity in loss of Real Estate Ventures		(748	)		(403	)
Provision for impairment		(2,730	)		(7,390	)
Loss on early extinguishment of debt		-			(66,590	)
Plus:
Interest income		393			320
Net gain on disposition of real estate		7,323			115,456
Net gain on Real Estate Venture transactions		14,582			5,929
Net income	$	21,271		$	46,310

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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+ Details

Commitments and Contingencies

3 Months Ended

Mar. 31, 2017

Commitments And Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

14. COMMITMENTS AND CONTINGENCIES

Legal Proceedings

The Company is involved from time to time in litigation on various matters, including disputes with tenants and disputes arising out of agreements to purchase or sell properties. Given the nature of the Company’s business activities, these lawsuits are considered routine to the conduct of its business. The result of any particular lawsuit cannot be predicted, because of the very nature of litigation, the litigation process and its adversarial nature, and the jury system. The Company will establish reserves for specific legal proceedings when it determines that the likelihood of an unfavorable outcome is probable and when the amount of loss is reasonably estimable. The Company does not expect that the liabilities, if any, that may ultimately result from such legal actions will have a material adverse effect on the consolidated financial position, results of operations or cash flows of the Company.

Letters-of-Credit

Under certain mortgages, the Company may be required to fund required leasing and capital reserve accounts for the benefit of the mortgage lenders with a letter-of-credit. As of March 31, 2017, there is an associated $10.0 million letter of credit for a mortgage lender. Certain of the tenant rents at properties that secure these mortgage loans are deposited into the loan servicer’s depository accounts, which are used to fund debt service, operating expenses, capital expenditures and the escrow and reserve accounts, as necessary. Any excess cash is included in cash and cash equivalents.

Environmental

As an owner of real estate, the Company is subject to various environmental laws of federal, state, and local governments. The Company’s compliance with existing laws has not had a material adverse effect on its financial condition and results of operations, and the Company does not believe it will have a material adverse effect in the future. However, the Company cannot predict the impact of unforeseen environmental contingencies or new or changed laws or regulations on its current Properties or on properties that the Company may acquire.

Ground Rent

Future minimum rental payments by the Company under the terms of all non-cancelable ground leases of land on which properties in the Company’s consolidated portfolio are situated are expensed on a straight-line basis regardless of when payments are due. The Company’s ground leases have remaining lease terms ranging from 4 to 72 years. Minimum future rental payments on non-cancelable leases at March 31, 2017 are as follows (in thousands):

Year	Minimum Rent
2017 (nine months remaining)	$	904
2018		1,205
2019		1,205
2020		1,205
2021		1,205
Thereafter		57,208
Total	$	62,932

The Company obtained ground tenancy rights related to three properties in Philadelphia, Pennsylvania, which provide for contingent rent participation by the lessor in certain capital transactions and net operating cash flows of the properties after certain returns are achieved by the Company. Such amounts, if any, will be reflected as contingent rent when incurred. The leases also provide for payment by the Company of certain operating costs relating to the land, primarily real estate taxes. The above schedule of future minimum rental payments does not include any contingent rent amounts or any reimbursed expenses. Reference is made in our Annual Report on Form 10-K for the year ended December 31, 2016 for further detail regarding commitments and contingencies.

Put Agreement

On May 4, 2015, the Company entered into a put agreement in the ordinary course of business that grants an unaffiliated third party the unilateral option to require the Company to purchase a property, at a predetermined price, until May 4, 2018. In addition to the $35.0 million purchase price, the Company would be responsible for transaction and closing costs. There can be no assurance that the counterparty will exercise the option.

Fair Value of Contingent Consideration

On April 2, 2015, the Company purchased 618 Market Street in Philadelphia, Pennsylvania. The allocated purchase price included contingent consideration of $2.0 million payable to the seller upon commencement of development. The liability was initially recorded at fair value of $1.6 million and will accrete through interest expense to $2.0 million over the expected period until development is commenced. The fair value of this contingent consideration was determined using a probability weighted discounted cash flow model. The significant inputs to the discounted cash flow model were the discount rate and weighted probability scenarios. As the inputs are unobservable, the Company determined the inputs used to value this liability fall within Level 3 for fair value reporting. As of March 31, 2017, the liability had accreted to $1.8 million. As there were no significant changes to the inputs, the liability remains within Level 3 for fair value reporting.

Debt Guarantees

As of March 31, 2017, the Company’s unconsolidated real estate ventures had aggregate indebtedness to third parties of $953.8 million. These loans are generally mortgage or construction loans, most of which are non-recourse to the Company. In addition, in certain instances, the Company provides non-recourse carve-out guarantees on these non-recourse loans. As of March 31, 2017, the loans for which there is recourse to the Company consists of the following: (i) a $55.4 million payment guaranty on the term loan for evo at Cira; (ii) a several cost overrun guaranty on the $88.9 million construction loan for the development project being undertaken by 1919 Market Street LP; and (ii) a $0.4 million payment guarantee on a loan provided to PJP VII. See Note 4, "Investment in Unconsolidated Real Estate Ventures," in the notes to the consolidated financial statements above for more information.

Other Commitments or Contingencies

On July 1, 2016, the Company closed on the acquisition of 34.6 acres of land located in Austin, Texas known as the Garza Ranch. As of March 31, 2017, Company is under agreement to sell 8.4 acres and has sold 1.7 acres (of the 34.6 acres) to two unaffiliated third parties. In connection with the agreements of sale, the Company entered into a development agreement and related completion guarantee to construct certain infrastructure improvements to the land on behalf of each buyer, estimated to cost $13.6 million. Total estimated costs related to the improvements are included in the sale price of each land parcel. Recognition of the sale of the land parcels is deferred until the improvements are completed.

On December 3, 2015, the Company entered into an agreement as development manager to construct Subaru of America’s (“Subaru”) corporate headquarters in Camden, New Jersey. The agreement provides the Company with the ability to earn additional profit if total project costs are less than the not-to-exceed (“NTE”) amount. The NTE amount, currently at $78.1 million, may be adjusted by change orders agreed upon by both Subaru and the Company. If construction costs are in excess of the NTE amount, the Company is obligated to pay such cost overruns. The terms of the guarantee do not provide a limitation on the costs the Company may be responsible for. As of March 31, 2017, the Company does not expect to incur costs in excess of the NTE amount.

Also on December 3, 2015, the Company entered into an agreement to construct an 83,000 square foot build-to-suit service center (the “Subaru NSTC Development”) on land parcels owned by the Company for Subaru as the single tenant. On such date, Subaru entered into an 18-year lease for the service center. The lease contains a purchase option, which allows Subaru to purchase the property at commencement of the lease, or five years subsequent to inception, at depreciated cost. The Company currently expects to deliver the building during the second quarter of 2018. At March 31, 2017, $10.8 million of the project costs, totaling $44.3 million, had been funded.

The Company invests in its properties and regularly incurs capital expenditures in the ordinary course of business to maintain the properties. The Company believes that such expenditures enhance its competitiveness. The Company also enters into construction, utility and service contracts in the ordinary course of business which may extend beyond one year. These contracts typically provide for cancellation with insignificant or no cancellation penalties.

Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2017
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	15. SUBSEQUENT EVENTS Preferred Share Redemption On April 11, 2017 (the “Redemption Date”), the Parent Company completed the previously announced redemption of all of its outstanding 4,000,000 Series E Preferred Shares at a redemption price of $25.00 per share (the “Redemption Price”). On April 17, 2017 (the “Distribution Payment Date”), the Parent Company paid each holder of record of Series E Preferred Shares on March 30, 2017 all accrued and unpaid distributions on the Series E Preferred Shares up to, but not including the Distribution Payment Date, which represents an amount equal to $0.50792 per share (the “Distribution”). From and after the Distribution Payment Date, distributions ceased to accrue, and on and after the Distribution Payment Date, the only remaining right of holders of the Series E Preferred Shares is the right to receive payment of the Redemption Price and Distribution. Following the redemption, the Series E Preferred Shares were delisted from the New York Stock Exchange. The Redemption Price together with the Distribution amounting to $102.0 million was paid by the Parent Company to the Depository Trust Company on April 11, 2017 from available cash balances on hand. On the Redemption Date, the Company recognized a preferred share redemption charge of $3.2 million related to the original issuance costs. In connection with this redemption, the Operating Partnership redeemed all of its 4,000,000 outstanding Series E-Linked Preferred Mirror Units.

Basis of Presentation (Policies)	3 Months Ended
Basis of Presentation (Policies)	Mar. 31, 2017
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The consolidated financial statements have been prepared by the Company pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (“SEC”) for interim financial statements. Certain information and footnote disclosures normally included in the annual financial statements prepared in accordance with accounting principles generally accepted in the United States of America ("U.S. GAAP") have been condensed or omitted pursuant to such rules and regulations. In the opinion of management, all adjustments (consisting solely of normal recurring matters) for a fair statement of the financial position of the Company as of March 31, 2017, the results of its operations for the three-month periods ended March 31, 2017 and 2016 and its cash flows for the three-month periods ended March 31, 2017 and 2016 have been included. The results of operations for such interim periods are not necessarily indicative of the results for a full year. These consolidated financial statements should be read in conjunction with the Parent Company’s and the Operating Partnership’s consolidated financial statements and footnotes included in their combined 2016 Annual Report on Form 10-K filed with the SEC on March 1, 2017. The Company's Annual Report on Form 10-K for the year ended December 31, 2016 contains a discussion of our significant accounting policies under Note 2, "Summary of Significant Accounting Policies". There have been no significant changes in our significant accounting policies since December 31, 2016. Management discusses our significant accounting policies and management’s judgments and estimates with the Company's Audit Committee.
Reclassifications	Reclassifications During the first quarter of 2017, the Company adopted ASU 2016-09, Improvements to Employee Share-Based Payment Accounting (“ASU 2016-09”), which requires the Company to reclassify employer tax payments on account of employee tax withholdings on share-based awards from operating activities to financing activities. Prior to the issuance of ASU 2016-09, there was no guidance on the classification of cash paid by an employer to the taxing authorities when directly withholding shares for tax withholding purposes. As a result of the adoption, a $0.3 million cash outflow has been reclassified in the March 31, 2016 consolidated statements of cash flows from operating activities to financing activities. There was no other impact from the adoption of this guidance. During the quarter ended December 31, 2016, the Company early adopted ASU 2016-15, “Classification of Certain Cash Receipts and Cash Payments” (“ASU 2016-15”), which clarifies that debt prepayment costs should be presented as financing activities in the statement of cash flows. As a result of the adoption, $53.4 million was reclassified in the consolidated statements of cash flows from the operating activities section to the financing activities section of the consolidated statements of cash flows, within the “Repayment of mortgage notes payable” caption, for the three-months period ended March 31, 2016. There was no other impact from the adoption of this guidance.
Recent Accounting Pronouncements	Recent Accounting Pronouncements On February 22, 2017, the FASB issued ASU No. 2017-05 (“ASU 2017-05) to provide guidance for recognizing gains and losses from the transfer of nonfinancial assets and in-substance non-financial assets in contracts with non-customers, unless other specific guidance applies. The standard requires a company to derecognize nonfinancial assets once it transfers control of a distinct nonfinancial asset or distinct in substance nonfinancial asset. Additionally, when a company transfers its controlling interest in a nonfinancial asset, but retains a noncontrolling ownership interest, the company is required to measure any non-controlling interest it receives or retains at fair value. The guidance requires companies to recognize a full gain or loss on the transaction. As a result of the new guidance, the guidance specific to real estate sales in ASC 360-20 will be eliminated. As such, sales and partial sales of real estate assets will now be subject to the same derecognition model as all other nonfinancial assets. The guidance is effective for annual periods beginning after December 15, 2017, including interim periods within that reporting period. The effective date of this guidance coincides with revenue recognition guidance. The Company is in the process of evaluating the impact of this new guidance and on its consolidated financial statements. The Company expects to utilize the modified retrospective approach. On January 5, 2017, the FASB issued ASU No. 2017-01 (“ASU 2017-01”) to amend the guidance for determining whether a transaction involves the purchase or disposal of a business or an asset. The amendments clarify that when substantially all of the fair value of the gross assets acquired or disposed of is concentrated in a single identifiable asset or a group of similar assets, the set of assets and activities is not a business. ASU 2017-01 is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years and early adoption is permitted for transactions which have not been previously reported in financial statements that have been issued. The Company adopted the guidance on the issuance date effective January 2017. The Company expects that most of its real estate acquisitions will be considered asset acquisitions under the new guidance and that transaction costs will be capitalized to the investment basis which is then subject to a purchase price allocation based on relative fair value.

Real Estate Investments (Tables)

3 Months Ended

Mar. 31, 2017

Real Estate Properties [Line Items]

Gross Carrying Value Of Company's Properties

As of March 31, 2017 and December 31, 2016, the gross carrying value of the Properties was as follows (in thousands):

	March 31,		December 31,
	2017		2016
Land	$	462,014	$	469,522
Building and improvements		2,801,495		2,683,087
Tenant improvements		438,695		433,686
Operating properties		3,702,204		3,586,295
Assets held for sale - real estate investments (a)		5,576		73,591
Total	$	3,707,780	$	3,659,886

(a)	Real estate investments related to assets held for sale above represents gross real estate assets and does not include accumulated depreciation or other assets on the balance sheet of the property held for sale. See “Held for Sale” below in this Note 3.

Dispositions

The Company sold the following eight office properties and one mixed-use property during the three-month period ended March 31, 2017 (dollars in thousands):

Disposition Date	Property/Portfolio Name	Location	Number of Properties	Rentable Square Feet		Sales Price		Net Proceeds on Sale		Gain/(Loss) on Sale (a)
March 30, 2017	200, 210 & 220 Lake Drive East (Woodland Falls)	Cherry Hill, NJ	3		215,465	$	19,000	$	17,771	$	(249	)	(b)
March 15, 2017	Philadelphia Marine Center (Marine Piers)	Philadelphia, PA	1		181,900		21,400		11,182		6,498		(c)
March 13, 2017	11700, 11710, 11720 & 11740 Beltsville Drive (Calverton)	Beltsville, MD	3		313,810		9,000		8,354		-		(d)
February 2, 2017	1200 & 1220 Concord Avenue (Concord Airport Plaza)	Concord, CA	2		350,256		33,100		32,010		551		(e)
Total Dispositions			9		1,061,431	$	82,500	$	69,317	$	6,800

(a)	Gain/(Loss) on Sale is net of closing and other transaction related costs.

(b)	During the fourth quarter of 2016, the Company recognized a $7.3 million impairment related to these properties.

(c)

(d)	During the fourth quarter of 2016, the Company recognized a $3.0 million impairment related to these properties. During the first quarter of 2017, there was a price reduction of $1.7 million under the agreement of sale and an additional impairment of $1.7 million was recognized.

(e)

The Company sold the following land parcels during the three-month period ended March 31, 2017 (dollars in thousands):

Disposition Date	Property/Portfolio Name	Location	Number of Parcels		Acres		Sales Price		Net Proceeds on Sale		Gain on Sale
February 15, 2017	Gateway Land C	Richmond, VA		1		4.8	$	1,100	$	1,043	$	-	(a)
January 30, 2017	Garza Ranch	Austin, TX		1		1.7		3,500		3,277		-	(b)
Total Dispositions				2		6.5	$	4,600	$	4,320	$	-

(a)	During the fourth quarter of 2016, the Company recognized a nominal impairment related to this land parcel.

(b)

Held for Sale Properties Included in Continuing Operations [Member]

Real Estate Properties [Line Items]

Summary of Properties Classified as Held for Sale but Which did not Meet the Criteria to be Classified within Discontinued Operations

The following is a summary of one property classified as held for sale but which did not meet the criteria to be classified within discontinued operations at March 31, 2017 (in thousands):

	Held for Sale Property Included in Continuing Operations
	March 31, 2017
	Other Segment - Retail
ASSETS HELD FOR SALE
Real estate investments:
Operating properties	$	5,576
Accumulated depreciation		(79	)
Operating real estate investments, net		5,497
Land held for development		-
Total real estate investments, net		5,497
Other assets		765
Total assets held for sale, net	$	6,262

LIABILITIES HELD FOR SALE
Other liabilities	$	387
Total liabilities held for sale	$	387

- Definition

Tabular disclosure of information related to a disposal group. Includes, but is not limited to, a discontinued operation, disposal classified as held-for-sale or disposed of by means other than sale or disposal of an individually significant component.

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-Section 50
-Paragraph 5D
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721677-107760

+ Details

Investment in Unconsolidated Real Estate Ventures (Tables)

3 Months Ended

Mar. 31, 2017

Equity Method Investments And Joint Ventures [Abstract]

Investment in Real Estate Ventures and Share of Real Estate Ventures' Income (Loss)

The following is a summary of the financial position of the Real Estate Ventures in which the Company held interests as of March 31, 2017 and December 31, 2016 (in thousands):

	March 31, 2017		December 31, 2016
Net property	$	1,405,986	$	1,483,067
Other assets		210,032		231,972
Other liabilities		107,161		129,486
Debt, net		946,891		989,738
Equity		561,966		595,815

Company’s share of equity (Company’s basis) (a)	$	264,941	$	281,331

(a)

The following is a summary of results of operations of the Real Estate Ventures in which the Company held interests during the three-month periods ended March 31, 2017 and 2016 (in thousands):

	Three-month periods ended March 31,
	2017			2016
Revenue	$	54,279		$	46,525
Operating expenses		(25,166	)		(26,668	)
Interest expense, net		(10,830	)		(8,989	)
Depreciation and amortization		(20,761	)		(20,160	)
Net loss (a)	$	(2,478	)	$	(9,292	)

Equity in loss of Real Estate Ventures	$	(748	)	$	(403	)

(a)	The three-month period ended March 31, 2016 amount includes $6.4 million of acquisition deal costs related to the formation of the MAP Venture during the three-month period ended March 31, 2016.

Intangible Assets and Liabilities (Tables)

3 Months Ended

Mar. 31, 2017

Goodwill And Intangible Assets Disclosure [Abstract]

Summary of Intangible Assets and Liabilities

As of March 31, 2017 and December 31, 2016, the Company’s intangible assets/liabilities were comprised of the following (in thousands):

	March 31, 2017
	Total Cost		Accumulated Amortization			Intangible Assets, net
Intangible assets, net:
In-place lease value	$	114,196	$	(54,834	)	$	59,362
Tenant relationship value		13,036		(10,378	)		2,658
Above market leases acquired		4,703		(2,501	)		2,202
Total intangible assets, net	$	131,935	$	(67,713	)	$	64,222

Acquired lease intangibles, net:
Below market leases acquired	$	30,683	$	(14,079	)	$	16,604

	December 31, 2016
	Total Cost		Accumulated Amortization			Intangible Assets, net
Intangible assets, net:
In-place lease value	$	142,889	$	(75,696	)	$	67,193
Tenant relationship value		13,074		(10,167	)		2,907
Above market leases acquired		4,718		(2,340	)		2,378
Total intangible assets, net	$	160,681	$	(88,203	)	$	72,478

Acquired lease intangibles, net:
Below market leases acquired	$	37,579	$	(19,460	)	$	18,119

Summary of Amortization for Intangible Assets and Liabilities

As of March 31, 2017, the Company’s annual amortization for its intangible assets/liabilities, assuming no prospective early lease terminations, are as follows (dollars in thousands):

	Assets		Liabilities
2017 (nine months remaining)	$	11,409	$	1,809
2018		11,754		2,196
2019		10,536		1,885
2020		8,457		1,337
2021		5,971		807
Thereafter		16,095		8,570
Total	$	64,222	$	16,604

Debt Obligations (Tables)

3 Months Ended

Mar. 31, 2017

Debt Disclosure [Abstract]

Consolidated debt obligations

The following table sets forth information regarding the Company’s consolidated debt obligations outstanding at March 31, 2017 and December 31, 2016 (in thousands):

	March 31, 2017			December 31, 2016			Effective Interest Rate				Maturity Date
MORTGAGE DEBT:

Two Logan Square	$	85,625		$	86,012			3.98	%		May 2020
One Commerce Square		126,198			127,026			3.64	%	(a)	Apr 2023
Two Commerce Square		112,000			112,000			4.51	%	(b)	Apr 2023
Principal balance outstanding		323,823			325,038
Plus: fair market value premium (discount), net		(2,652	)		(2,761	)
Less: deferred financing costs		(687	)		(728	)
Mortgage indebtedness	$	320,484		$	321,549

UNSECURED DEBT
Seven-Year Term Loan - Swapped to fixed	$	250,000		$	250,000			3.72	%		Oct 2022
$300.0M 5.70% Guaranteed Notes due 2017		300,000			300,000			5.68	%		May 2017
$325.0M 4.95% Guaranteed Notes due 2018		325,000			325,000			5.13	%		Apr 2018
$250.0M 3.95% Guaranteed Notes due 2023		250,000			250,000			4.02	%		Feb 2023
$250.0M 4.10% Guaranteed Notes due 2024		250,000			250,000			4.33	%		Oct 2024
$250.0M 4.55% Guaranteed Notes due 2029		250,000			250,000			4.60	%		Oct 2029
Indenture IA (Preferred Trust I)		27,062			27,062			2.75	%		Mar 2035
Indenture IB (Preferred Trust I)		25,774			25,774			3.30	%		Apr 2035
Indenture II (Preferred Trust II)		25,774			25,774			3.09	%		Jul 2035
Principal balance outstanding		1,703,610			1,703,610
Plus: original issue premium (discount), net		(4,424	)		(4,678	)
Less: deferred financing costs		(6,999	)		(7,369	)
Total unsecured indebtedness	$	1,692,187		$	1,691,563
Total Debt Obligations	$	2,012,671		$	2,013,112

(a)

(b)

Fair Value of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2017

Fair Value Disclosures [Abstract]

Schedule of Financial Instruments With Fair Values Different From Their Carrying Amount

The following are financial instruments for which the Company’s estimates of fair value differ from the carrying amounts (in thousands):

	March 31, 2017				December 31, 2016
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Unsecured notes payable	$	1,365,398	$	1,381,975	$	1,364,854	$	1,372,758
Variable rate debt	$	326,789	$	307,917	$	326,709	$	307,510
Mortgage notes payable	$	320,484	$	327,144	$	321,549	$	328,853
Note receivable (a)	$	3,401	$	3,918	$	3,380	$	3,717

Fair Value of Derivative Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2017

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value

Hedge Product	Hedge Type	Designation		Notional Amount				Strike			Trade Date	Maturity Date	Fair value
				3/31/2017		12/31/2016							3/31/2017			12/31/2016
Assets
Swap	Interest Rate	Cash Flow	(a)	$	250,000	$	250,000		3.718	%	October 8, 2015	October 8, 2022	$	4,572		$	3,733

Liabilities
Swap	Interest Rate	Cash Flow	(a)		25,774		25,774		3.300	%	December 22, 2011	January 30, 2021		(169	)		(300	)
Swap	Interest Rate	Cash Flow	(a)		25,774		25,774		3.090	%	January 6, 2012	October 30, 2019		(93	)		(214	)
Swap	Interest Rate	Cash Flow	(a)		27,062		27,062		2.750	%	December 21, 2011	September 30, 2017		(37	)		(83	)
				$	328,610	$	328,610

(a)	Hedging unsecured variable rate debt.

Beneficiaries Equity of the Parent Company (Tables)

3 Months Ended

Mar. 31, 2017

Equity [Abstract]

Earnings Per Share (EPS), Basic and Diluted

	Three-month periods ended March 31,
	2017						2016
	Basic			Diluted			Basic			Diluted
Numerator
Income from continuing operations	$	21,271		$	21,271		$	46,310		$	46,310
Net income from continuing operations attributable to non-controlling interests		(169	)		(169	)		(389	)		(389	)
Nonforfeitable dividends allocated to unvested restricted shareholders		(99	)		(99	)		(105	)		(105	)
Preferred share dividends		(1,725	)		(1,725	)		(1,725	)		(1,725	)
Net income attributable to common shareholders	$	19,278		$	19,278		$	44,091		$	44,091
Denominator
Weighted-average shares outstanding		175,176,964			175,176,964			174,788,945			174,788,945
Contingent securities/Share based compensation		-			1,024,908			-			682,468
Weighted-average shares outstanding		175,176,964			176,201,872			174,788,945			175,471,413
Earnings per Common Share:
Net income attributable to common shareholders	$	0.11		$	0.11		$	0.25		$	0.25

Partners Equity of the Operating Partnership (Tables)

3 Months Ended

Mar. 31, 2017

Earnings Per Share (EPS), Basic and Diluted

	Three-month periods ended March 31,
	2017						2016
	Basic			Diluted			Basic			Diluted
Numerator
Income from continuing operations	$	21,271		$	21,271		$	46,310		$	46,310
Net income from continuing operations attributable to non-controlling interests		(169	)		(169	)		(389	)		(389	)
Nonforfeitable dividends allocated to unvested restricted shareholders		(99	)		(99	)		(105	)		(105	)
Preferred share dividends		(1,725	)		(1,725	)		(1,725	)		(1,725	)
Net income attributable to common shareholders	$	19,278		$	19,278		$	44,091		$	44,091
Denominator
Weighted-average shares outstanding		175,176,964			175,176,964			174,788,945			174,788,945
Contingent securities/Share based compensation		-			1,024,908			-			682,468
Weighted-average shares outstanding		175,176,964			176,201,872			174,788,945			175,471,413
Earnings per Common Share:
Net income attributable to common shareholders	$	0.11		$	0.11		$	0.25		$	0.25

BRANDYWINE OPERATING PARTNERSHIP, L.P.

Earnings Per Share (EPS), Basic and Diluted

	Three-month periods ended March 31,
	2017						2016
	Basic			Diluted			Basic			Diluted
Numerator
Income from continuing operations	$	21,271		$	21,271		$	46,310		$	46,310
Nonforfeitable dividends allocated to unvested restricted unitholders		(99	)		(99	)		(105	)		(105	)
Preferred unit dividends		(1,725	)		(1,725	)		(1,725	)		(1,725	)
Net income attributable to non-controlling interests		(5	)		(5	)		(2	)		(2	)
Net income attributable to common unitholders	$	19,442		$	19,442		$	44,478		$	44,478
Denominator
Weighted-average units outstanding		176,656,763			176,656,763			176,324,047			176,324,047
Contingent securities/Share based compensation		-			1,024,908			-			682,468
Total weighted-average units outstanding		176,656,763			177,681,671			176,324,047			177,006,515
Earnings per Common Partnership Unit:
Net income attributable to common unitholders	$	0.11		$	0.11		$	0.25		$	0.25

Share Based Compensation, 401(k) Plan and Deferred Compensation (Tables)

3 Months Ended

Mar. 31, 2017

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Company's Restricted Share Activity

The following table summarizes the Company’s restricted share activity during the three months ended March 31, 2017:

	Shares			Weighted Average Grant Date Fair Value		Aggregate Intrinsic Value
Non-vested at January 1, 2017		488,604		$	14.10	$	8,066,852
Granted		141,751			16.68		2,364,127
Vested		(9,394	)		14.90		153,216
Forfeited		(2,000	)		13.58
Non-vested at March 31, 2017		618,961		$	14.68	$	10,045,737

Schedule of Restricted Performance Share Units Plan

The table below presents certain information as to unvested RPSU awards.

	RPSU Grant
	2/23/2015		2/22/2016		3/1/2017		Total

(Amounts below in shares, unless otherwise noted)
Non-vested at January 1, 2017		147,589		231,388		-		378,977
Units Granted		-		-		174,854		174,854
Units Cancelled		-		-		-		-
Non-vested at March 31, 2017		147,589		231,388		174,854		553,831

Measurement Period Commencement Date	1/1/2015		1/1/2016		1/1/2017
Measurement Period End Date	12/31/2017		12/31/2018		12/31/2019
Units Granted		186,395		231,388		174,854
Fair Value of Units on Grant Date (in thousands)	$	3,933	$	3,558	$	3,735

Segment Information (Tables)

3 Months Ended

Mar. 31, 2017

Segment Reporting [Abstract]

Real Estate Investments, Net Operating Income and Unconsolidated Real Estate Ventures of Reportable Segments

The following tables provide selected asset information and results of operations of the Company's reportable segments (in thousands):

Real estate investments, at cost:
	March 31, 2017		December 31, 2016
Philadelphia CBD	$	1,471,258	$	1,320,974
Pennsylvania Suburbs		1,006,780		1,005,446
Metropolitan Washington, D.C.		974,838		975,987
Austin, Texas		146,858		146,794
Other		102,470		137,094
	$	3,702,204	$	3,586,295
Assets held for sale (a)		5,576		73,591
Operating Properties	$	3,707,780	$	3,659,886

Corporate
Construction-in-progress	$	166,372	$	297,462
Land held for development	$	153,268	$	150,970

(a)	As of March 31, 2017, the Company categorized a retail property located in the Other segment as held for sale in accordance with applicable accounting standards for long lived assets. See Note 3, “Real Estate Investments,” for further information.

None of the above aforementioned sales or properties classified as held for sale are considered significant dispositions under the accounting guidance for discontinued operations.

Net operating income (in thousands):

	Three-month periods ended
	March 31,
	2017							2016
	Total revenue		Operating expenses (a)			Net operating income		Total revenue		Operating expenses (a)			Net operating income
Philadelphia CBD	$	54,449	$	(20,837	)	$	33,612	$	49,670	$	(19,256	)	$	30,414
Pennsylvania Suburbs		35,655		(12,584	)		23,071		37,106		(13,155	)		23,951
Metropolitan Washington, D.C.		23,362		(9,383	)		13,979		27,339		(10,899	)		16,440
Austin, Texas		9,123		(3,573	)		5,550		8,547		(3,255	)		5,292
Other		6,362		(3,856	)		2,506		12,740		(7,602	)		5,138
Corporate		1,969		(848	)		1,121		1,100		(608	)		492
Operating Properties	$	130,920	$	(51,081	)	$	79,839	$	136,502	$	(54,775	)	$	81,727

(a)	Includes property operating expense, real estate taxes and third party management expense.

Unconsolidated real estate ventures (in thousands):
	Investment in real estate ventures, at equity				Equity in loss of real estate ventures
	As of				Three-month periods ended March 31,
	March 31, 2017		December 31, 2016		2017			2016
Philadelphia CBD	$	44,618	$	48,691	$	(67	)	$	455
Pennsylvania Suburbs		3,147		15,421		276			265
Metropolitan Washington, D.C.		143,591		141,786		467			(448	)
MAP Venture (a)		17,776		20,893		(1,117	)		(556	)
Other		1,713		1,654		58			161
Austin, Texas		54,096		52,886		(365	)		(280	)
Total	$	264,941	$	281,331	$	(748	)	$	(403	)

(a)

Reconciliation of Consolidated NOI to Consolidated Net Income (Loss)

The following is a reconciliation of consolidated NOI to consolidated net income, as defined by GAAP (in thousands):

	Three-month periods ended March 31,
	2017			2016

Consolidated net operating income	$	79,839		$	81,727
Less:
Interest expense		(21,437	)		(23,691	)
Interest expense - amortization of deferred financing costs		(634	)		(774	)
Interest expense - financing obligation		-			(281	)
Depreciation and amortization		(45,892	)		(48,873	)
General and administrative expenses		(9,425	)		(9,120	)
Equity in loss of Real Estate Ventures		(748	)		(403	)
Provision for impairment		(2,730	)		(7,390	)
Loss on early extinguishment of debt		-			(66,590	)
Plus:
Interest income		393			320
Net gain on disposition of real estate		7,323			115,456
Net gain on Real Estate Venture transactions		14,582			5,929
Net income	$	21,271		$	46,310

Commitments and Contingencies (Tables)

3 Months Ended

Mar. 31, 2017

Commitments And Contingencies Disclosure [Abstract]

Minimum Future Rental Payments on Non-cancelable Leases

Minimum future rental payments on non-cancelable leases at March 31, 2017 are as follows (in thousands):

Year	Minimum Rent
2017 (nine months remaining)	$	904
2018		1,205
2019		1,205
2020		1,205
2021		1,205
Thereafter		57,208
Total	$	62,932

Organization of The Parent Company and The Operating Partnership (Textual) (Details) - Mar. 31, 2017 ft² in Millions	Total	property	ft²	Real_Estate_Investment	a	Apartment_unit
Organization of The Parent Company and The Operating Partnership [Line Items]
Number of Properties		104
Office Properties [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Number of Properties		90
Mixed Use Properties [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Number of Properties		6
Retail Properties [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Number of Properties		1
Core Properties [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Number of Properties		97
Development Property [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Number of Properties		3
Redevelopment Properties [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Number of Properties		3
Assets Held-for-sale [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Number of Properties		1
Unconsolidated Real Estate Ventures [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Number of Unconsolidated Investments in Real Estate Ventures \| Real_Estate_Investment				13
Unconsolidated Real Estate Ventures [Member] \| Seven Real Estate Ventures [Member] \| Office Properties [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Number of Unconsolidated Investments in Real Estate Ventures \| Real_Estate_Investment				7
Rentable Square Feet \| ft²			8.0
Unconsolidated Real Estate Ventures [Member] \| Two Real Estate Ventures [Member] \| Undeveloped Land [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Number of Unconsolidated Investments in Real Estate Ventures \| Real_Estate_Investment				2
Acreage of land \| a					4.3
Unconsolidated Real Estate Ventures [Member] \| Two Other Real Estate Ventures [Member] \| Under Active Development Land [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Number of Unconsolidated Investments in Real Estate Ventures \| Real_Estate_Investment				2
Acreage of land \| a					1.4
Unconsolidated Real Estate Ventures [Member] \| Two Other Real Estate Ventures [Member] \| Residential Tower One [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Number of Unconsolidated Investments in Real Estate Ventures \| Real_Estate_Investment				1
Number of Property units		345				345
Unconsolidated Real Estate Ventures [Member] \| Two Other Real Estate Ventures [Member] \| Residential Tower Two [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Number of Unconsolidated Investments in Real Estate Ventures \| Real_Estate_Investment				1
Number of Property units		321				321
Parent Company [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Ownership in the Operating Partnership	99.20%
Net Rentable Square Feet \| ft²			16.5
Area Owned by Company of Undeveloped Parcels of Land \| a					312
Area of Additional Undeveloped Parcels of Land With Option to Purchase \| a					60
Total Potential Development Capacity \| ft²			12.2
Wholly-owned Management Company Subsidiaries [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Net Rentable Square Feet \| ft²			26.7
Wholly-owned Management Company Subsidiaries [Member] \| Partially Owned Properties [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Net Rentable Square Feet \| ft²			10.2
Wholly-owned Management Company Subsidiaries [Member] \| Wholly Owned Properties [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Net Rentable Square Feet \| ft²			16.5
Wholly-owned Management Company Subsidiaries [Member] \| Office and Industrial Properties [Member] \| Partially Owned Properties [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Net Rentable Square Feet \| ft²			10.2

Basis of Presentation (Textual) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Basis Of Presentation [Line Items]
Shares used for employee taxes upon vesting of share awards	$ 129	$ 289
ASU 2016-09 [Member] \| Reclassified from Operating Activities to Financing Activities [Member]
Basis Of Presentation [Line Items]
Shares used for employee taxes upon vesting of share awards		300
ASU 2016-15 [Member] \| Reclassified from Operating Activities to Financing Activities [Member]
Basis Of Presentation [Line Items]
Debt prepayment costs		$ 53,400

Real Estate Investments - Gross Carrying Value of Properties (Details) - USD ($)
$ in Thousands

Mar. 31, 2017

Dec. 31, 2016

Property, Plant and Equipment, Gross [Abstract]

Land

$ 462,014

$ 469,522

Tenant improvements

438,695

433,686

Operating properties

3,702,204

3,586,295

Assets held for sale - real estate investments

^[1],[2]

5,576

73,591

Total

3,707,780

3,659,886

Building and Improvements [Member]

Property, Plant and Equipment, Gross [Abstract]

Operating properties

$ 2,801,495

$ 2,683,087

[1]	As of March 31, 2017, the Company categorized a retail property located in the Other segment as held for sale in accordance with applicable accounting standards for long lived assets. See Note 3, “Real Estate Investments,” for further information.
[2]	Real estate investments related to assets held for sale above represents gross real estate assets and does not include accumulated depreciation or other assets on the balance sheet of the property held for sale. See “Held for Sale” below in this Note 3.

Real Estate Investments - Dispositions (Textual) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) property segment	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net gain on disposition of real estate	$ 7,323	$ 115,456
Number of Properties \| property	104
Aggregate carrying values of properties	$ 3,702,204		$ 3,586,295
Other Segment [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Number of Properties \| segment	4
Impairment of properties held for use	$ 1,000
Carrying value of real estate prior to impairment	$ 10,200
Impairment Hold Period	10 years
Residual Capitalization Rates	9.00%
Discount Rates	9.25%
Impairment on Held for Use Properties [Member] \| Other Segment [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Aggregate carrying values of properties	$ 9,200
2970 Market Street (Cira Square) [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net gain on disposition of real estate	$ 500
Office Properties [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Number of Properties Sold \| property	8
Number of Properties \| property	90
Mixed-use Property [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Number of Properties Sold \| property	1

Real Estate Investments - Summary of Office Properties Sold (Details)
$ in Thousands

3 Months Ended

Mar. 31, 2017

USD ($)

ft²

property

Mar. 31, 2016

USD ($)

Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]

Net Proceeds on Sale

$ 74,159

$ 704,911

Gain (Loss) on Sale

$ 7,323

$ 115,456

Philadelphia Marine Center (Marine Piers) [Member]

Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]

Rentable Square Feet | ft²

181,900

Sales Price

$ 21,400

Net Proceeds on Sale

11,200

Gain (Loss) on Sale

$ 6,500

Office Building and Mixed-use Property [Member]

Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]

Number of Properties Sold | property

Rentable Square Feet | ft²

1,061,431

Sales Price

$ 82,500

Net Proceeds on Sale

69,317

Gain (Loss) on Sale

^[1]

$ 6,800

Office Building and Mixed-use Property [Member] | 200, 210 & 220 Lake Drive East (Woodland Falls) [Member]

Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]

Number of Properties Sold | property

Rentable Square Feet | ft²

215,465

Sales Price

$ 19,000

Net Proceeds on Sale

17,771

Gain (Loss) on Sale

^[1],[2]

$ (249)

Office Building and Mixed-use Property [Member] | Philadelphia Marine Center (Marine Piers) [Member]

Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]

Number of Properties Sold | property

Rentable Square Feet | ft²

181,900

Sales Price

$ 21,400

Net Proceeds on Sale

11,182

Gain (Loss) on Sale

^[1],[3]

$ 6,498

Office Building and Mixed-use Property [Member] | 11700, 11710, 11720 & 11740 Beltsville Drive (Calverton) [Member]

Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]

Number of Properties Sold | property

Rentable Square Feet | ft²

313,810

Sales Price

$ 9,000

Net Proceeds on Sale

8,354

Gain (Loss) on Sale

^[1],[4]

$ 0

Office Building and Mixed-use Property [Member] | 1200 & 1220 Concord Avenue (Concord Airport Plaza) [Member]

Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]

Number of Properties Sold | property

Rentable Square Feet | ft²

350,256

Sales Price

$ 33,100

Net Proceeds on Sale

32,010

Gain (Loss) on Sale

^[1],[5]

$ 551

[1]	Gain/(Loss) on Sale is net of closing and other transaction related costs.
[2]	During the fourth quarter of 2016, the Company recognized a $7.3 million impairment related to these properties.
[3]	On March 15, 2017, the Company sold its sublease interest in the Piers at Penn’s Landing (the “Marine Piers”), which includes leasehold improvements containing 181,900 net rentable square feet, and a marina, located in Philadelphia, Pennsylvania for a sales price of $21.4 million, which will be paid in two installments. On the closing date, the buyer paid $12.0 million in cash. On the second purchase price installment date, the buyer will pay $9.4 million. The second purchase price installment is due on (a) January 31, 2020, in the event that the tenant at the Marine Piers does not exercise its existing option to extend the term of the sublease or (b) January 15, 2024, in the event that the tenant does exercise its current extension option to extend the term of the sublease. In accordance with ASC 360-20, Real Estate Sales, the Company determined that it is appropriate to account for the sales transaction under the cost recovery method. The Company received cash proceeds of $11.2 million, after closing costs and prorations, and the net book value of the Marine Piers was $4.7 million, resulting in a gain on sale of $6.5 million. The remaining gain on sale of $9.4 million will be recognized on the second purchase price installment date.
[4]	During the fourth quarter of 2016, the Company recognized a $3.0 million impairment related to these properties. During the first quarter of 2017, there was a price reduction of $1.7 million under the agreement of sale and an additional impairment of $1.7 million was recognized.
[5]	This sale is designated as a like-kind exchange under Section 1031 of the Internal Revenue Code (“IRC”) and, as such, the proceeds, totaling $32.0 million after closing costs and prorations, were deposited with a Qualified Intermediary, as defined under the IRC. The proceeds received at closing were recorded as “Other assets” in the Company’s consolidated balance sheet as of March 31, 2017. During the fourth quarter of 2016, the Company recognized a $11.5 million impairment related to these properties.

Real Estate Investments - Summary of Office Properties Sold (Parenthetical) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) ft² Installment	Dec. 31, 2016 USD ($)	Mar. 31, 2016 USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Proceeds from the sale of properties	$ 74,159		$ 704,911
Assets held for sale, net	6,262	$ 41,718
Net gain on disposition of real estate	$ 7,323		$ 115,456
200, 210 & 220 Lake Drive East (Woodland Falls) [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Provision for impairment on assets held for sale		7,300
Philadelphia Marine Center (Marine Piers) [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Rentable Square Feet \| ft²	181,900
Sales Price	$ 21,400
Number of installments \| Installment	2
First installment payment	$ 12,000
Second installment payment	$ 9,400
Date of second installment payment	Jan. 31, 2020
Proceeds from the sale of properties	$ 11,200
Assets held for sale, net	4,700
Net gain on disposition of real estate	6,500
Deferred gain on sale	9,400
11700, 11710, 11720 & 11740 Beltsville Drive (Calverton) [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Provision for impairment on assets held for sale	1,700	3,000
Purchase price reduction	1,700
1200 & 1220 Concord Avenue (Concord Airport Plaza) [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Provision for impairment on assets held for sale		$ 11,500
Proceeds after closing costs and prorations	$ 32,000

Real Estate Investments - Summary of Land Parcels Sold (Details)
$ in Thousands

3 Months Ended

Mar. 31, 2017

USD ($)

Parcel

Mar. 31, 2016

USD ($)

Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]

Proceeds from the sale of properties

$ 74,159

$ 704,911

Gain on Sale

$ 7,323

$ 115,456

Land [Member]

Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]

Number of Parcels | Parcel

Acreage of land | a

6.5

Sales Price

$ 4,600

Proceeds from the sale of properties

4,320

Gain on Sale

$ 0

Gateway L and C [Member] | Land [Member]

Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]

Number of Parcels | Parcel

Acreage of land | a

4.8

Sales Price

$ 1,100

Proceeds from the sale of properties

1,043

Gain on Sale

^[1]

$ 0

Garza Ranch [Member] | Land [Member]

Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]

Number of Parcels | Parcel

Acreage of land | a

1.7

Sales Price

$ 3,500

Proceeds from the sale of properties

3,277

Gain on Sale

^[2]

$ 0

[1]

During the fourth quarter of 2016, the Company recognized a nominal impairment related to this land parcel.

[2]

Real Estate Investments - Summary of Properties Classified as Held for Sale Included in Continuing Operations (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
ASSETS HELD FOR SALE
Total assets held for sale, net	$ 6,262	$ 41,718
LIABILITIES HELD FOR SALE
Total liabilities held for sale	387	$ 81
Held for Sale Properties Included in Continuing Operations [Member] \| Other Segment - Retail [Member]
ASSETS HELD FOR SALE
Operating properties	5,576
Accumulated depreciation	(79)
Operating real estate investments, net	5,497
Land held for development	0
Total real estate investments, net	5,497
Other assets	765
Total assets held for sale, net	6,262
LIABILITIES HELD FOR SALE
Other liabilities	387
Total liabilities held for sale	$ 387

Investment in Unconsolidated Real Estate Ventures (Textual) (Details) ft² in Millions		3 Months Ended
	Jan. 31, 2017 USD ($) property	Mar. 31, 2017 USD ($) property	Mar. 31, 2016 USD ($)	Mar. 31, 2017	Mar. 31, 2017 property	Mar. 31, 2017 ft²	Mar. 31, 2017 Real_Estate_Investment	Mar. 31, 2017 a	Mar. 31, 2017 Apartment_unit	Dec. 31, 2016 USD ($)
Schedule Of Equity Method Investments [Line Items]
Management fees		$ 6,485,000	$ 5,235,000
Accounts receivable		12,099,000								$ 12,446,000
Cash proceeds after the payment of share of the debt and closing costs		27,230,000	4,812,000
Net gain on Real Estate Venture transactions		14,582,000	5,929,000
1919 Venture [Member]
Schedule Of Equity Method Investments [Line Items]
Guarantees, maximum exposure amount		$ 88,900,000
TB-BDN Plymouth Apartments [Member]
Schedule Of Equity Method Investments [Line Items]
Sale of ownership interest percentage	50.00%
Gross sales price	$ 100,500,000
Allocated gross sales value of ownership interest, percentage	50.00%
Guarantee obligations cancelled	$ 3,200,000
Cash proceeds after the payment of share of the debt and closing costs	27,200,000
Net gain on Real Estate Venture transactions	14,600,000
TB-BDN Plymouth Apartments [Member] \| Pennsylvania [Member]
Schedule Of Equity Method Investments [Line Items]
Construction Loan	$ 54,000,000
Office Properties [Member]
Schedule Of Equity Method Investments [Line Items]
Number of Properties Sold \| property		8
Multi-Family Complex [Member] \| TB-BDN Plymouth Apartments [Member]
Schedule Of Equity Method Investments [Line Items]
Number of Properties Sold \| property	398
Real Estate Venture [Member]
Schedule Of Equity Method Investments [Line Items]
Management fees		$ 1,500,000	$ 1,500,000
Accounts receivable		1,600,000								$ 1,400,000
Unconsolidated Real Estate Ventures [Member]
Schedule Of Equity Method Investments [Line Items]
Number of Unconsolidated Investments in Real Estate Ventures \| Real_Estate_Investment							13
Equity Method Investments including net liabilities		264,900,000
Real estate ventures aggregate indebtedness to third parties		953,800,000
Unconsolidated Real Estate Ventures [Member] \| TB-BDN Plymouth Apartments [Member]
Schedule Of Equity Method Investments [Line Items]
Equity in income (loss) of Real Estate Ventures	$ 12,600,000
Unconsolidated Real Estate Ventures [Member] \| Minimum [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investment percentage				20.00%
Unconsolidated Real Estate Ventures [Member] \| Maximum [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investment percentage				70.00%
Unconsolidated Real Estate Ventures [Member] \| Seven Real Estate Ventures [Member] \| Office Properties [Member]
Schedule Of Equity Method Investments [Line Items]
Number of Unconsolidated Investments in Real Estate Ventures \| Real_Estate_Investment							7
Rentable Square Feet \| ft²						8.0
Unconsolidated Real Estate Ventures [Member] \| Two Real Estate Ventures [Member] \| Undeveloped Land [Member]
Schedule Of Equity Method Investments [Line Items]
Number of Unconsolidated Investments in Real Estate Ventures \| Real_Estate_Investment							2
Acreage of land \| a								4.3
Unconsolidated Real Estate Ventures [Member] \| Two Other Real Estate Ventures [Member] \| Under Active Development Land [Member]
Schedule Of Equity Method Investments [Line Items]
Number of Unconsolidated Investments in Real Estate Ventures \| Real_Estate_Investment							2
Acreage of land \| a								1.4
Unconsolidated Real Estate Ventures [Member] \| Two Other Real Estate Ventures [Member] \| Residential Tower One [Member]
Schedule Of Equity Method Investments [Line Items]
Number of Unconsolidated Investments in Real Estate Ventures \| Real_Estate_Investment							1
Number of Property units					345				345
Unconsolidated Real Estate Ventures [Member] \| Two Other Real Estate Ventures [Member] \| Residential Tower Two [Member]
Schedule Of Equity Method Investments [Line Items]
Number of Unconsolidated Investments in Real Estate Ventures \| Real_Estate_Investment							1
Number of Property units					321				321
evo at Cira Centre South Venture [Member]
Schedule Of Equity Method Investments [Line Items]
Guarantees, maximum exposure amount		55,400,000
PJP VII [Member]
Schedule Of Equity Method Investments [Line Items]
Guarantees, maximum exposure amount		$ 400,000

Investment in Unconsolidated Real Estate Ventures - Summary of Financial Position of Real Estate Ventures (Details) - USD ($)
$ in Thousands

Mar. 31, 2017

Dec. 31, 2016

Schedule Of Equity Method Investments [Line Items]

Company’s share of equity (Company’s basis)

$ 264,941

$ 281,331

Unconsolidated Real Estate Ventures [Member]

Schedule Of Equity Method Investments [Line Items]

Net property

1,405,986

1,483,067

Other assets

210,032

231,972

Other liabilities

107,161

129,486

Debt, net

946,891

989,738

Equity

561,966

595,815

Company’s share of equity (Company’s basis)

^[1]

$ 264,941

$ 281,331

[1]

Investment in Unconsolidated Real Estate Ventures - Summary of Results of Operations of Real Estate Ventures with Interests (Details) - USD ($)
$ in Thousands

3 Months Ended

Mar. 31, 2017

Mar. 31, 2016

Schedule Of Equity Method Investments [Line Items]

Equity in loss of Real Estate Ventures

$ (748)

$ (403)

Unconsolidated Real Estate Ventures [Member]

Schedule Of Equity Method Investments [Line Items]

Revenue

54,279

46,525

Operating expenses

(25,166)

(26,668)

Interest expense, net

(10,830)

(8,989)

Depreciation and amortization

(20,761)

(20,160)

Net loss

^[1]

(2,478)

(9,292)

Equity in loss of Real Estate Ventures

$ (748)

$ (403)

[1]	The three-month period ended March 31, 2016 amount includes $6.4 million of acquisition deal costs related to the formation of the MAP Venture during the three-month period ended March 31, 2016.

Investment in Unconsolidated Real Estate Ventures - Summary of Results of Operations of Real Estate Ventures with Interests (Parenthetical) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($)
MAP Venture [Member]
Schedule Of Equity Method Investments [Line Items]
Acquisition deal costs	$ 6.4

Intangible Assets and Liabilities - Intangible Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Intangible Assets [Line Items]
Intangible Assets, Total Cost	$ 131,935	$ 160,681
Intangible Assets, Accumulated Amortization	(67,713)	(88,203)
Intangible Assets, net	64,222	72,478
Acquired Lease Intangibles, Net	16,604	18,119
Below market leases [Member]
Intangible Assets [Line Items]
Acquired Lease Intangibles, Gross	30,683	37,579
Acquired Lease Intangibles, Accumulated Amortization	(14,079)	(19,460)
Acquired Lease Intangibles, Net	16,604	18,119
In-place lease value [Member]
Intangible Assets [Line Items]
Intangible Assets, Total Cost	114,196	142,889
Intangible Assets, Accumulated Amortization	(54,834)	(75,696)
Intangible Assets, net	59,362	67,193
Tenant relationship value [Member]
Intangible Assets [Line Items]
Intangible Assets, Total Cost	13,036	13,074
Intangible Assets, Accumulated Amortization	(10,378)	(10,167)
Intangible Assets, net	2,658	2,907
Above market leases acquired [Member]
Intangible Assets [Line Items]
Intangible Assets, Total Cost	4,703	4,718
Intangible Assets, Accumulated Amortization	(2,501)	(2,340)
Intangible Assets, net	$ 2,202	$ 2,378

Intangible Assets and Liabilities - Annual Amortization of Intangible Assets, Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Assets
2017 (nine months remaining)	$ 11,409
2018	11,754
2019	10,536
2020	8,457
2021	5,971
Thereafter	16,095
Intangible Assets, net	64,222	$ 72,478
Liabilities
2017 (nine months remaining)	1,809
2018	2,196
2019	1,885
2020	1,337
2021	807
Thereafter	8,570
Acquired Lease Intangibles, Net	$ 16,604	$ 18,119

Debt Obligations - Consolidated Debt Obligations Outstanding (Details) - USD ($)
$ in Thousands

3 Months Ended

Mar. 31, 2017

Dec. 31, 2016

Dec. 31, 2015

Consolidated debt obligations

Total Debt Obligations

$ 2,012,671

$ 2,013,112

Secured Debt [Member]

Consolidated debt obligations

Long-term Debt, Gross

323,823

325,038

Plus: premiums/(discounts), net

(2,652)

(2,761)

Less: deferred financing costs

(687)

(728)

Total mortgage indebtedness

320,484

321,549

Unsecured Debt [Member]

Consolidated debt obligations

Long-term Debt, Gross

1,703,610

Plus: premiums/(discounts), net

(4,424)

(4,678)

Less: deferred financing costs

(6,999)

(7,369)

Total unsecured indebtedness

1,692,187

1,691,563

Two Logan Square [Member] | Secured Debt [Member]

Consolidated debt obligations

Long-term Debt, Gross

$ 85,625

86,012

Effective interest rate

3.98%

Debt instrument maturity date

May 01, 2020

One Commerce Square [Member] | Secured Debt [Member]

Consolidated debt obligations

Long-term Debt, Gross

$ 126,198

127,026

Effective interest rate

3.64%

^[1]

3.64%

Debt instrument maturity date

Apr. 05, 2023

Two Commerce Square [Member] | Secured Debt [Member]

Consolidated debt obligations

Long-term Debt, Gross

$ 112,000

112,000

Effective interest rate

^[2]

4.51%

Debt instrument maturity date

Apr. 05, 2023

Seven Year Term Loan - Swapped to fixed [Member] | Unsecured Debt [Member]

Consolidated debt obligations

Long-term Debt, Gross

$ 250,000

250,000

Effective interest rate

3.72%

Debt instrument maturity date

Oct. 01, 2022

$300.0M 5.70% Guaranteed Notes due 2017 [Member] | Unsecured Debt [Member]

Consolidated debt obligations

Long-term Debt, Gross

$ 300,000

300,000

Effective interest rate

5.68%

Debt instrument maturity date

May 01, 2017

$325.0M 4.95% Guaranteed Notes due 2018 [Member] | Unsecured Debt [Member]

Consolidated debt obligations

Long-term Debt, Gross

$ 325,000

325,000

Effective interest rate

5.13%

Debt instrument maturity date

Apr. 15, 2018

$250M 3.95% Guaranteed Notes due 2023 [Member] | Unsecured Debt [Member]

Consolidated debt obligations

Long-term Debt, Gross

$ 250,000

250,000

Effective interest rate

4.02%

Debt instrument maturity date

Feb. 15, 2023

250.0M 4.10% Guaranteed Notes due 2024 [Member] | Unsecured Debt [Member]

Consolidated debt obligations

Long-term Debt, Gross

$ 250,000

250,000

Effective interest rate

4.33%

Debt instrument maturity date

Oct. 01, 2024

$250M 4.55% Guaranteed Notes due 2029 [Member] | Unsecured Debt [Member]

Consolidated debt obligations

Long-term Debt, Gross

$ 250,000

250,000

Effective interest rate

4.60%

Debt instrument maturity date

Oct. 01, 2029

Indenture IA (Preferred Trust I) [Member] | Unsecured Debt [Member]

Consolidated debt obligations

Long-term Debt, Gross

$ 27,062

27,062

Effective interest rate

2.75%

Debt instrument maturity date

Mar. 30, 2035

Indenture IB (Preferred Trust I) [Member] | Unsecured Debt [Member]

Consolidated debt obligations

Long-term Debt, Gross

$ 25,774

25,774

Effective interest rate

3.30%

Debt instrument maturity date

Apr. 30, 2035

Indenture II (Preferred Trust II) [Member] | Unsecured Debt [Member]

Consolidated debt obligations

Long-term Debt, Gross

$ 25,774

Effective interest rate

3.09%

Debt instrument maturity date

Jul. 30, 2035

[1]

[2]

Debt Obligations - Consolidated Debt Obligations Outstanding (Parenthetical) (Details) - One Commerce Square [Member] - Secured Debt [Member] - USD ($)
$ in Millions

3 Months Ended

Dec. 29, 2015

Mar. 31, 2017

Dec. 31, 2015

Debt Instrument [Line Items]

Debt instrument increase in principal

$ 130.0

Debt instrument maturity date

Apr. 05, 2023

Effective interest rate

3.64%

^[1]

3.64%

[1]

Debt Obligations (Textual) (Details) - USD ($)	May 15, 2015	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
Revolving Credit Facility [Member] \| New Credit Facility [Member]
Debt Instrument [Line Items]
Debt term	4 years
Maximum borrowing capacity	$ 600,000,000
Line of credit		$ 0		$ 0
Secured Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate		4.03%	4.03%
Long-term Debt, Gross		$ 323,823,000	$ 325,038,000

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References + Details

Fair Value of Financial Instruments - Financial Instruments for which Estimates of Fair Value Differ from Carrying Amounts (Details) - USD ($)
$ in Thousands

Mar. 31, 2017

Dec. 31, 2016

Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]

Mortgage notes payable, net

$ 320,484

$ 321,549

Carrying Amount [Member]

Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]

Note receivable

^[1]

3,401

3,380

Carrying Amount [Member] | Unsecured Notes Payable [Member]

Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]

Unsecured notes payable

1,365,398

1,364,854

Carrying Amount [Member] | Variable Rate Debt [Member]

Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]

Variable rate debt

326,789

326,709

Carrying Amount [Member] | Mortgages Notes Payable [Member]

Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]

Mortgage notes payable, net

320,484

321,549

Fair Value [Member]

Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]

Note receivable, fair value

^[1]

3,918

3,717

Fair Value [Member] | Unsecured Notes Payable [Member]

Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]

Debt instrument, fair value

1,381,975

1,372,758

Fair Value [Member] | Variable Rate Debt [Member]

Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]

Debt instrument, fair value

307,917

307,510

Fair Value [Member] | Mortgages Notes Payable [Member]

Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]

Debt instrument, fair value

$ 327,144

$ 328,853

[1]

Fair Value of Financial Instruments (Textual) (Details)	3 Months Ended	12 Months Ended
Fair Value of Financial Instruments (Textual) (Details)	Mar. 31, 2017	Dec. 31, 2016
Variable rate and mortgage debt [Member]
Fair Value Inputs Liabilities Quantitative Information [Line Items]
Discount Rates	4.507%	4.353%

Limited Partners' Non-Controlling Interests in the Parent Company (Textual) (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Noncontrolling Interest [Abstract]
Aggregate amount related to non-controlling interests classified within equity	$ 14.9	$ 14.9
Settlement value of non controlling interest in operating partnership	$ 24.0	$ 24.4

Fair Value of Derivative Financial Instruments - Terms and Fair Values of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Derivatives Fair Value [Line Items]
Notional Amount	$ 328,610	$ 328,610
3.718% Interest Rate Swap Maturing October 8, 2022 [Member] \| Cash Flow Hedging [Member]
Derivatives Fair Value [Line Items]
Derivative, Fixed Interest Rate	3.718%
Derivative Asset, Notional Amount	$ 250,000	250,000
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	4,572	3,733
3.300% Interest Rate Swap Maturing January 30, 2021 [Member] \| Cash Flow Hedging [Member]
Derivatives Fair Value [Line Items]
Derivative Liability, Notional Amount	$ 25,774	25,774
Derivative, Fixed Interest Rate	3.30%
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	$ (169)	(300)
3.090% Interest Rate Swap Maturing October 30, 2019 [Member] \| Cash Flow Hedging [Member]
Derivatives Fair Value [Line Items]
Derivative Liability, Notional Amount	$ 25,774	25,774
Derivative, Fixed Interest Rate	3.09%
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	$ (93)	(214)
2.750% Interest Rate Swap Maturing September 30, 2017 [Member] \| Cash Flow Hedging [Member]
Derivatives Fair Value [Line Items]
Derivative Liability, Notional Amount	$ 27,062	27,062
Derivative, Fixed Interest Rate	2.75%
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	$ (37)	$ (83)

Beneficiaries Equity of the Parent Company - Number of Shares and Net Income Used to Calculate Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Numerator
Income from continuing operations, Basic	$ 21,271	$ 46,310
Net income from continuing operations attributable to non-controlling interests, Basic	(169)	(389)
Nonforfeitable dividends allocated to unvested restricted shareholders, Basic	(99)	(105)
Distribution to preferred shareholders	(1,725)	(1,725)
Net income attributable to Common Shareholders of Brandywine Realty Trust	19,278	44,091
Net income from continuing operations attributable to non-controlling interests, Diluted	(169)	(389)
Nonforfeitable dividends allocated to unvested restricted shareholders, Diluted	(99)	(105)
Net income attributable to common shareholders, Diluted	$ 19,278	$ 44,091
Denominator
Basic weighted average shares outstanding (in shares)	175,176,964	174,788,945
Contingent securities/Share based compensation (in shares)	1,024,908	682,468
Diluted weighted average shares outstanding (in shares)	176,201,872	175,471,413
Earnings per Common Share:
Net income attributable to common shareholders, Basic (USD per share)	$ 0.11	$ 0.25
Net income attributable to common shareholders, Diluted (USD per share)	$ 0.11	$ 0.25

Beneficiaries Equity of the Parent Company (Textual) (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended		12 Months Ended
	Mar. 10, 2017	Mar. 01, 2017	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Class of Stock [Line Items]
Dividends, Common Stock		$ 28,300
Preferred Stock, Dividend Rate, Percentage			6.90%		6.90%
Dividends, Preferred Stock			$ 1,725	$ 1,725
Redemption outstanding shares			4,000,000		4,000,000
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Class of Stock [Line Items]
Preferred Stock, Dividend Rate, Percentage			6.90%		6.90%
Dividends, Preferred Stock			$ 1,725	$ 1,725
Redemption outstanding shares			4,000,000		4,000,000
Series E Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Dividend Rate, Percentage			6.90%
Preferred Stock, Liquidation Preference Per Share			$ 25.00
Dividends, Preferred Stock		$ 1,700
Redemption outstanding shares	4,000,000
Redemption price per share	$ 25.00
Series E Preferred Stock [Member] \| BRANDYWINE OPERATING PARTNERSHIP, L.P.
Class of Stock [Line Items]
Redemption outstanding shares	4,000,000
Redemption price per share	$ 25.00
Redemption date	Apr. 11, 2017
Dividend Declared [Member]
Class of Stock [Line Items]
Dividends Payable, Amount Per Share		$ 0.16
Dividend Declared [Member] \| BRANDYWINE OPERATING PARTNERSHIP, L.P.
Class of Stock [Line Items]
Dividends Payable, Amount Per Share		$ 0.16
Redeemable Common Limited Partnership Units [Member]
Class of Stock [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share			1,479,799	1,535,102

Partners Equity of the Operating Partnership - Number of Units and Net Income Used to Calculate Basic and Diluted Earnings Per Common Partnership Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Numerator
Income from continuing operations, Basic	$ 21,271	$ 46,310
Nonforfeitable dividends allocated to unvested restricted shareholders, Basic	(99)	(105)
Distribution to preferred shareholders	(1,725)	(1,725)
Nonforfeitable dividends allocated to unvested restricted shareholders, Diluted	$ (99)	$ (105)
Denominator
Basic weighted average shares outstanding (in shares)	175,176,964	174,788,945
Contingent securities/Share based compensation (in shares)	1,024,908	682,468
Diluted weighted average shares outstanding (in shares)	176,201,872	175,471,413
Earnings per Common Partnership Unit
Net income attributable to common unitholders, Basic (USD per share)	$ 0.11	$ 0.25
Net income attributable to common unitholders, Diluted (USD per share)	$ 0.11	$ 0.25
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Numerator
Income from continuing operations, Basic	$ 21,271	$ 46,310
Nonforfeitable dividends allocated to unvested restricted shareholders, Basic	(99)	(105)
Distribution to preferred shareholders	(1,725)	(1,725)
Net income attributable to non-controlling interests	(5)	(2)
Net income attributable to common unitholders, Basic	19,442	44,478
Nonforfeitable dividends allocated to unvested restricted shareholders, Diluted	(99)	(105)
Net income attributable to common unitholders, Diluted	$ 19,442	$ 44,478
Denominator
Basic weighted average shares outstanding (in shares)	176,656,763	176,324,047
Contingent securities/Share based compensation (in shares)	1,024,908	682,468
Diluted weighted average shares outstanding (in shares)	177,681,671	177,006,515
Earnings per Common Partnership Unit
Net income attributable to common unitholders, Basic (USD per share)	$ 0.11	$ 0.25
Net income attributable to common unitholders, Diluted (USD per share)	$ 0.11	$ 0.25

Partners Equity of the Operating Partnership (Textual) (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended	12 Months Ended
	Mar. 01, 2017	Mar. 31, 2017	Dec. 31, 2016	Mar. 10, 2017	Mar. 31, 2016
Earnings Per Common Partnership Unit [Line Items]
Distributions payable		$ 30,047	$ 30,032		$ 28,278
Preferred Stock, Dividend Rate, Percentage		6.90%	6.90%
Preferred Stock, Shares Outstanding		4,000,000	4,000,000
Series E Preferred Stock [Member]
Earnings Per Common Partnership Unit [Line Items]
Preferred Stock, Dividend Rate, Percentage		6.90%
Preferred Stock, Liquidation Preference Per Share		$ 25.00
Preferred Stock, Shares Outstanding				4,000,000
Redemption price per share				$ 25.00
Dividend Declared [Member]
Earnings Per Common Partnership Unit [Line Items]
Dividends Payable, Amount Per Share	$ 0.16
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Earnings Per Common Partnership Unit [Line Items]
Distributions payable		$ 30,047	$ 30,032		$ 28,278
Preferred Stock, Dividend Rate, Percentage		6.90%	6.90%
Preferred Stock, Shares Outstanding		4,000,000	4,000,000
BRANDYWINE OPERATING PARTNERSHIP, L.P. \| 6.90% Series E-linked Preferred Units [Member]
Earnings Per Common Partnership Unit [Line Items]
Preferred Stock, Dividend Rate, Percentage		6.90%
Preferred Stock, Liquidation Preference Per Share		$ 25.00
BRANDYWINE OPERATING PARTNERSHIP, L.P. \| Series E Preferred Stock [Member]
Earnings Per Common Partnership Unit [Line Items]
Preferred Stock, Shares Outstanding				4,000,000
Redemption price per share				$ 25.00
BRANDYWINE OPERATING PARTNERSHIP, L.P. \| Dividend Declared [Member]
Earnings Per Common Partnership Unit [Line Items]
Dividends Payable, Amount Per Share	$ 0.16
BRANDYWINE OPERATING PARTNERSHIP, L.P. \| Dividend Paid [Member]
Earnings Per Common Partnership Unit [Line Items]
Distributions payable		$ 28,300
BRANDYWINE OPERATING PARTNERSHIP, L.P. \| Dividend Paid [Member] \| 6.90% Series E-linked Preferred Units [Member]
Earnings Per Common Partnership Unit [Line Items]
Dividends, Preferred Stock, Cash	$ 1,700

Share Based Compensation, 401(k) Plan and Deferred Compensation (Textual) (Details) $ / shares in Units, $ in Millions				3 Months Ended
	Mar. 07, 2017 Installment shares	Mar. 01, 2017 shares	Feb. 01, 2017 shares	Mar. 31, 2017 USD ($) shares	Mar. 31, 2016 USD ($)	Feb. 06, 2017 $ / shares
Restricted Share Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number \| shares				618,961
Vesting period				3 years
Unrecognized compensation expenses \| $				$ 2.9
Weighted average period over which options will be recognized				1 year 6 months
Share-based compensation expense \| $				$ 1.5	$ 1.2
Share-based compensation expense, capitalized \| $				$ 0.3	0.3
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period				three years from the initial grant dates
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period \| shares				141,751
Voluntary Termination Of Employment Terms				after reaching at least age 57 and accumulating at least 15 years of service with the Company
Accumulated Service Period For Voluntary Termination				15 years
Restricted Share Awards [Member] \| Executive Officer [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Voluntary Termination of Employment Age Limit				57 years
Restricted Share Awards [Member] \| Non-Officer Employees [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period \| shares	32,122
Number of Vesting Installments \| Installment	2
Restricted Share Awards [Member] \| Cliff Vest [Member] \| Executive Officer [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period \| shares		109,629
Share Based Compensation Arrangement By Share Based Payment Award, Vesting Date		Apr. 15, 2020
Restricted Share Awards [Member] \| Installment One [Member] \| Non-Officer Employees [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award, Vesting Date	Apr. 15, 2018
Restricted Share Awards [Member] \| Installment Two [Member] \| Non-Officer Employees [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award, Vesting Date	Apr. 15, 2019
Restricted Performance Share Units Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation expenses \| $				$ 2.9
Weighted average period over which options will be recognized				1 year 10 months 24 days
Share-based compensation expense \| $				$ 2.4	1.7
Share-based compensation expense, capitalized \| $				$ 0.5	$ 0.5
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period				3 year
Common shares issued for share based compensation \| shares			55,299
Dividends Payable, Amount Per Share \| $ / shares						$ 0.16
Restricted Performance Share Units Plan [Member] \| Executive Officer [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period \| shares				174,854
Restricted Performance Share Units Plan [Member] \| Cliff Vest [Member] \| Executive Officer [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights				three year cliff vesting period

Share Based Compensation, 401(k) Plan and Deferred Compensation - Restricted Share Activity (Details) - Restricted Share Awards [Member]	3 Months Ended
	Mar. 31, 2017 USD ($) $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Non-vested at January 1, 2017, Shares \| shares	488,604
Granted, shares \| shares	141,751
Vested, shares \| shares	(9,394)
Forfeited, shares \| shares	(2,000)
Non-vested at March 31, 2017, Shares \| shares	618,961
Non-vested at January 1, 2016, Weighted Average Grant Date Fair Value \| $ / shares	$ 14.10
Granted, Weighted Average Grant Date Fair Value \| $ / shares	16.68
Vested, Weighted Average Grant Date Fair Value \| $ / shares	14.90
Forfeited, Weighted Average Grant Date Fair Value \| $ / shares	13.58
Non-vested at December 31, 2016, Weighted Average Grant Date Fair Value \| $ / shares	$ 14.68
Non-vested at January 1, 2016, Aggregate Intrinsic Value \| $	$ 8,066,852
Granted, Aggregate Intrinsic Value \| $	2,364,127
Vested, Aggregate Intrinsic Value \| $	153,216
Non-vested at December 31, 2016, Aggregate Intrinsic Value \| $	$ 10,045,737

Share Based Compensation, 401(k) Plan and Deferred Compensation - Restricted Performance Share Units (Details) - Restricted Performance Share Units Plan [Member] - Executive Officer [Member] - USD ($) $ in Thousands				3 Months Ended
	Mar. 01, 2017	Feb. 22, 2016	Feb. 23, 2015	Mar. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Non-vested at January 1, 2017, Shares				378,977
Granted, shares				174,854
Units Cancelled				0
Non-vested at March 31, 2017, Shares				553,831
Units Granted	174,854	231,388	186,395
Fair Value of Units on Grant Date (in thousands)	$ 3,735	$ 3,558	$ 3,933
February 23, 2015 RSPU Grant [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Non-vested at January 1, 2017, Shares				147,589
Granted, shares				0
Units Cancelled				0
Non-vested at March 31, 2017, Shares				147,589
Measurement Period Commencement Date				Jan. 01, 2015
Measurement Period End Date				Dec. 31, 2017
February 22, 2016 RSPU Grant [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Non-vested at January 1, 2017, Shares				231,388
Granted, shares				0
Units Cancelled				0
Non-vested at March 31, 2017, Shares				231,388
Measurement Period Commencement Date				Jan. 01, 2016
Measurement Period End Date				Dec. 31, 2018
March 01, 2017 RSPU Grant [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Non-vested at January 1, 2017, Shares				0
Granted, shares				174,854
Units Cancelled				0
Non-vested at March 31, 2017, Shares				174,854
Measurement Period Commencement Date				Jan. 01, 2017
Measurement Period End Date				Dec. 31, 2019

Segment Information (Textual) (Details)		3 Months Ended
Segment Information (Textual) (Details)	Feb. 02, 2017 property	Mar. 31, 2017 property segment
Segment Reporting Information [Line Items]
Number of Reportable Segments \| segment		5
Office Properties [Member]
Segment Reporting Information [Line Items]
Number of Properties Sold		8
Office Properties [Member] \| 1200 & 1220 Concord Avenue (Concord Airport Plaza) [Member]
Segment Reporting Information [Line Items]
Number of Properties Sold	2

Segment Information - Real Estate Investments, at Cost of Company's Reportable Segments (Details) - USD ($)
$ in Thousands

Mar. 31, 2017

Dec. 31, 2016

Segment Reporting Information [Line Items]

Operating properties

$ 3,702,204

$ 3,586,295

Assets held for sale

^[1],[2]

5,576

73,591

Operating Properties

3,707,780

3,659,886

Construction-in-progress

166,372

297,462

Land held for development

153,268

150,970

Philadelphia CBD [Member]

Segment Reporting Information [Line Items]

Operating properties

1,471,258

1,320,974

Pennsylvania Suburbs [Member]

Segment Reporting Information [Line Items]

Operating properties

1,006,780

1,005,446

Metropolitan DC [Member]

Segment Reporting Information [Line Items]

Operating properties

974,838

975,987

Austin, Texas [Member]

Segment Reporting Information [Line Items]

Operating properties

146,858

146,794

Other [Member]

Segment Reporting Information [Line Items]

Operating properties

$ 102,470

$ 137,094

[1]	As of March 31, 2017, the Company categorized a retail property located in the Other segment as held for sale in accordance with applicable accounting standards for long lived assets. See Note 3, “Real Estate Investments,” for further information.
[2]	Real estate investments related to assets held for sale above represents gross real estate assets and does not include accumulated depreciation or other assets on the balance sheet of the property held for sale. See “Held for Sale” below in this Note 3.

Segment Information - Net Operating Income of Company's Reportable Segments (Details) - USD ($)
$ in Thousands

3 Months Ended

Mar. 31, 2017

Mar. 31, 2016

Segment Reporting Information [Line Items]

Total revenue

$ 130,920

$ 136,502

Operating expenses

^[1]

(51,081)

(54,775)

Net operating income

79,839

81,727

Operating Segments [Member] | Philadelphia CBD [Member]

Segment Reporting Information [Line Items]

Total revenue

54,449

49,670

Operating expenses

^[1]

(20,837)

(19,256)

Net operating income

33,612

30,414

Operating Segments [Member] | Pennsylvania Suburbs [Member]

Segment Reporting Information [Line Items]

Total revenue

35,655

37,106

Operating expenses

^[1]

(12,584)

(13,155)

Net operating income

23,071

23,951

Operating Segments [Member] | Metropolitan DC [Member]

Segment Reporting Information [Line Items]

Total revenue

23,362

27,339

Operating expenses

^[1]

(9,383)

(10,899)

Net operating income

13,979

16,440

Operating Segments [Member] | Austin, Texas [Member]

Segment Reporting Information [Line Items]

Total revenue

9,123

8,547

Operating expenses

^[1]

(3,573)

(3,255)

Net operating income

5,550

5,292

Operating Segments [Member] | Other [Member]

Segment Reporting Information [Line Items]

Total revenue

6,362

12,740

Operating expenses

^[1]

(3,856)

(7,602)

Net operating income

2,506

5,138

Corporate [Member]

Segment Reporting Information [Line Items]

Total revenue

1,969

1,100

Operating expenses

^[1]

(848)

(608)

Net operating income

$ 1,121

$ 492

[1]	Includes property operating expense, real estate taxes and third party management expense.

Segment Information - Unconsolidated Real Estate Ventures of Company's Reportable Segments (Details) - USD ($)
$ in Thousands

3 Months Ended

Mar. 31, 2017

Mar. 31, 2016

Dec. 31, 2016

Segment Reporting Information [Line Items]

Investment in Real Estate Ventures, at equity

$ 264,941

$ 281,331

Equity in loss of Real Estate Ventures

(748)

$ (403)

Philadelphia CBD [Member]

Segment Reporting Information [Line Items]

Investment in Real Estate Ventures, at equity

44,618

48,691

Equity in loss of Real Estate Ventures

(67)

455

Pennsylvania Suburbs [Member]

Segment Reporting Information [Line Items]

Investment in Real Estate Ventures, at equity

3,147

15,421

Equity in loss of Real Estate Ventures

276

265

Metropolitan DC [Member]

Segment Reporting Information [Line Items]

Investment in Real Estate Ventures, at equity

143,591

141,786

Equity in loss of Real Estate Ventures

467

(448)

MAP Venture [Member]

Segment Reporting Information [Line Items]

Investment in Real Estate Ventures, at equity

^[1]

17,776

20,893

Equity in loss of Real Estate Ventures

^[1]

(1,117)

(556)

Other [Member]

Segment Reporting Information [Line Items]

Investment in Real Estate Ventures, at equity

1,713

1,654

Equity in loss of Real Estate Ventures

161

Austin, Texas [Member]

Segment Reporting Information [Line Items]

Investment in Real Estate Ventures, at equity

54,096

$ 52,886

Equity in loss of Real Estate Ventures

$ (365)

$ (280)

[1]

Segment Information - Reconciliation of Consolidated NOI to Consolidated Net Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting [Abstract]
Consolidated net operating income	$ 79,839	$ 81,727
Less:
Interest expense	(21,437)	(23,691)
Interest expense - amortization of deferred financing costs	(634)	(774)
Interest expense - financing obligation	0	(281)
Depreciation and amortization	(45,892)	(48,873)
General and administrative expenses	(9,425)	(9,120)
Equity in loss of Real Estate Ventures	(748)	(403)
Provision for impairment	(2,730)	(7,390)
Loss on early extinguishment of debt	0	(66,590)
Plus:
Interest income	393	320
Net gain on disposition of real estate	7,323	115,456
Net gain on Real Estate Venture transactions	14,582	5,929
Net income	$ 21,271	$ 46,310

Commitments and Contingencies (Textual) (Details)			3 Months Ended
Commitments and Contingencies (Textual) (Details)	Dec. 03, 2015 ft²	Apr. 02, 2015 USD ($)	Mar. 31, 2017 USD ($) a	Jul. 01, 2016 USD ($) a
Subaru Corporate Headquarters Project [Member]
Property Subject to or Available for Operating Lease [Line Items]
NTE Amount			$ 78,100,000
Subaru Build-to-Service Center Project [Member]
Property Subject to or Available for Operating Lease [Line Items]
Lease terms	18 years
Rentable Square Feet \| ft²	83,000
Purchase option of lease from inception period	5 years
Project costs funded			10,800,000
Project costs			44,300,000
1919 Venture [Member]
Property Subject to or Available for Operating Lease [Line Items]
Guarantees, maximum exposure amount			88,900,000
Unconsolidated Real Estate Ventures [Member]
Property Subject to or Available for Operating Lease [Line Items]
Real estate ventures aggregate indebtedness to third parties			953,800,000
evo at Cira Centre South Venture [Member]
Property Subject to or Available for Operating Lease [Line Items]
Guarantees, maximum exposure amount			55,400,000
PJP VII [Member]
Property Subject to or Available for Operating Lease [Line Items]
Guarantees, maximum exposure amount			400,000
618 Market Street [Member]
Property Subject to or Available for Operating Lease [Line Items]
Contingent consideration, liability		$ 2,000,000	$ 1,800,000
Fair value of contingent consideration		1,600,000
Interest expense		$ 2,000,000
Garza Land Acquisition [Member]
Property Subject to or Available for Operating Lease [Line Items]
Acreage of land \| a				34.6
Area of land under agreement to sell \| a			8.4
Area of land sold \| a			1.7
Infrastructure improvements to land, estimated cost				$ 13,600,000
Put Agreement [Member]
Property Subject to or Available for Operating Lease [Line Items]
Purchase price			$ 35,000,000
Minimum [Member]
Property Subject to or Available for Operating Lease [Line Items]
Lease terms			4 years
Maximum [Member]
Property Subject to or Available for Operating Lease [Line Items]
Lease terms			72 years
Mortgage Lenders [Member]
Property Subject to or Available for Operating Lease [Line Items]
Associated letter of credit			$ 10,000,000

Commitments and Contingencies - Minimum Future Rental Payments on Non-cancelable Leases (Details) $ in Thousands	Mar. 31, 2017 USD ($)
Commitments And Contingencies Disclosure [Abstract]
2017 (nine months remaining)	$ 904
2018	1,205
2019	1,205
2020	1,205
2021	1,205
Thereafter	57,208
Total	$ 62,932

Subsequent Events (Textual) (Details) - Series E Preferred Stock [Member] - USD ($) $ / shares in Units, $ in Millions	Apr. 11, 2017	Mar. 10, 2017
Subsequent Event [Line Items]
Redemption price per share		$ 25.00
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Subsequent Event [Line Items]
Redemption date		Apr. 11, 2017
Redemption price per share		$ 25.00
Subsequent Event [Member]
Subsequent Event [Line Items]
Redemption date	Apr. 11, 2017
Redemption of outstanding preferred shares	4,000,000
Redemption price per share	$ 25.00
Distribution payment date	Apr. 17, 2017
Distribution date of record	Mar. 30, 2017
Distribution amount per share	$ 0.50792
Distribution amount paid	$ 102.0
Preferred share redemption charge	$ 3.2
Subsequent Event [Member] \| BRANDYWINE OPERATING PARTNERSHIP, L.P.
Subsequent Event [Line Items]
Redemption of outstanding preferred shares	4,000,000