Brandywine Operating Partnership 10-Q 24 Oct 16 2016 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information Document - shares	9 Months Ended
	Sep. 30, 2016	Oct. 21, 2016
Document Information [Line Items]
Entity Registrant Name	BRANDYWINE REALTY TRUST
Entity Central Index Key	790,816
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding		175,140,760
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Document Information [Line Items]
Entity Registrant Name	BRANDYWINE OPERATING PARTNERSHIP, L.P.
Entity Central Index Key	1,060,386
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q3
Amendment Flag	false

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Real estate investments:
Operating properties	$ 3,686,339	$ 3,693,000
Accumulated depreciation	(869,836)	(867,035)
Operating real estate investments, net	2,816,503	2,825,965
Construction-in-progress	249,183	268,983
Land held for development	155,297	130,479
Total real estate investments, net	3,220,983	3,225,427
Assets held for sale, net	12,604	584,365
Cash and cash equivalents	219,059	56,694
Accounts receivable, net of allowance of $2,304 and $1,736 in 2016 and 2015, respectively	9,925	17,126
Accrued rent receivable, net of allowance of $13,009 and $14,442 in 2016 and 2015, respectively	145,816	145,092
Investment in Real Estate Ventures, equity method	282,162	241,004
Deferred costs, net of accumulated amortization of $58,769 and $67,899, respectively	92,054	101,419
Intangible assets, net	81,207	111,623
Other assets	79,108	71,761
Total assets	4,142,918	4,554,511
LIABILITIES AND EQUITY
Mortgage notes payable, net	322,623	545,753
Unsecured term loans, net	248,016	247,800
Unsecured senior notes, net	1,442,922	1,591,164
Accounts payable and accrued expenses	106,546	99,856
Distributions payable	30,036	28,249
Deferred income, gains and rent	30,022	30,413
Acquired lease intangibles, net	19,731	25,655
Liabilities related to assets held for sale	49	2,151
Other liabilities	31,399	31,379
Total liabilities	2,231,344	2,602,420
Commitments and contingencies
Equity:
6.90% Series E Preferred Shares, $0.01 par value; issued and outstanding- 4,000,000 in 2016 and 2015	40	40
Common Shares of Brandywine Realty Trust's beneficial interest, $0.01 par value; shares authorized 400,000,000; 175,140,760 and 174,688,568 issued and outstanding in 2016 and 2015, respectively	1,752	1,747
Additional paid-in-capital	3,258,049	3,252,622
Deferred compensation payable in common shares	13,684	11,918
Common shares in grantor trust, 899,457 in 2016, 745,686 in 2015	(13,684)	(11,918)
Cumulative earnings	551,572	499,086
Accumulated other comprehensive loss	(15,052)	(5,192)
Cumulative distributions	(1,902,076)	(1,814,378)
Total Brandywine Realty Trust's equity	1,894,285	1,933,925
Non-controlling interests	17,289	18,166
Total beneficiaries' equity	1,911,574	1,952,091
Total liabilities and beneficiaries' equity	4,142,918	4,554,511
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Real estate investments:
Operating properties	3,686,339	3,693,000
Accumulated depreciation	(869,836)	(867,035)
Operating real estate investments, net	2,816,503	2,825,965
Construction-in-progress	249,183	268,983
Land held for development	155,297	130,479
Total real estate investments, net	3,220,983	3,225,427
Assets held for sale, net	12,604	584,365
Cash and cash equivalents	219,059	56,694
Accounts receivable, net of allowance of $2,304 and $1,736 in 2016 and 2015, respectively	9,925	17,126
Accrued rent receivable, net of allowance of $13,009 and $14,442 in 2016 and 2015, respectively	145,816	145,092
Investment in Real Estate Ventures, equity method	282,162	241,004
Deferred costs, net of accumulated amortization of $58,769 and $67,899, respectively	92,054	101,419
Intangible assets, net	81,207	111,623
Other assets	79,108	71,761
Total assets	4,142,918	4,554,511
LIABILITIES AND EQUITY
Mortgage notes payable, net	322,623	545,753
Unsecured term loans, net	248,016	247,800
Unsecured senior notes, net	1,442,922	1,591,164
Accounts payable and accrued expenses	106,546	99,856
Distributions payable	30,036	28,249
Deferred income, gains and rent	30,022	30,413
Acquired lease intangibles, net	19,731	25,655
Liabilities related to assets held for sale	49	2,151
Other liabilities	31,399	31,379
Total liabilities	2,231,344	2,602,420
Commitments and contingencies
Redeemable limited partnership units at redemption value; 1,479,799 and 1,535,102 issued and outstanding in 2016 and 2015, respectively	23,351	22,114
Equity:
6.90% Series E Preferred Shares, $0.01 par value; issued and outstanding- 4,000,000 in 2016 and 2015	96,850	96,850
General Partnership Capital 175,101,033 and 174,688,568 units issued and outstanding in 2016 and 2015, respectively	1,804,799	1,836,692
Accumulated other comprehensive loss	(15,543)	(5,597)
Non-controlling interest - consolidated real estate ventures	2,117	2,032
Total partners' equity	1,888,223	1,929,977
Total Brandywine Operating Partnership, L.P.'s equity	1,886,106	1,927,945
Total liabilities and beneficiaries' equity	$ 4,142,918	$ 4,554,511

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Accounts receivable, allowance	$ 2,304	$ 1,736
Accrued rent receivable, allowance	13,009	14,442
Deferred costs, accumulated amortization	$ 58,769	$ 67,899
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	175,140,760	174,688,568
Common Stock, Shares, Outstanding	175,140,760	174,688,568
Common Shares in Grantor Trust	899,457	745,686
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Accounts receivable, allowance	$ 2,304	$ 1,736
Accrued rent receivable, allowance	13,009	14,442
Deferred costs, accumulated amortization	$ 58,769	$ 67,899
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	1,535,102
Redeemable Limited Partnership Units Outstanding	1,479,799	1,535,102
General Partners' Capital Account, Units Issued	175,140,760	174,688,568
General Partners' Capital Account, Units Outstanding	175,140,760	174,688,568

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenue
Rents	$ 104,537	$ 124,263	$ 318,324	$ 363,800
Tenant reimbursements	17,324	21,553	53,315	64,006
Termination fees	611	1,097	1,459	2,561
Third party management fees, labor reimbursement and leasing	6,248	4,274	17,691	12,805
Other	974	1,398	2,588	5,467
Total revenue	129,694	152,585	393,377	448,639
Operating expenses
Property operating expenses	37,250	43,894	114,208	133,175
Real estate taxes	11,566	13,119	34,933	37,632
Third party management expenses	2,501	1,605	7,172	4,858
Depreciation and amortization	46,956	58,314	142,736	160,355
General and administrative expenses	5,515	6,127	20,711	21,554
Provision for impairment	0	0	13,069	2,508
Total operating expenses	103,788	123,059	332,829	360,082
Operating income	25,906	29,526	60,548	88,557
Other income (expense)
Interest income	291	126	970	1,189
Tax credit transaction income	0	11,853	0	11,853
Interest expense	(20,814)	(27,900)	(64,334)	(83,971)
Interest expense - amortization of deferred financing costs	(645)	(1,010)	(2,063)	(3,377)
Interest expense - financing obligation	(156)	(296)	(679)	(906)
Equity in loss of Real Estate Ventures	(7,254)	(1,093)	(9,323)	(1,835)
Net gain (loss) on disposition of real estate	(104)	6,083	114,625	16,673
Net gain on sale of undepreciated real estate	188	3,019	188	3,019
Net gain from remeasurement of investments in Real Estate Ventures	0	0	0	758
Net gain on Real Estate Venture transactions	10,472	0	19,529	0
Loss on early extinguishment of debt	0	0	(66,590)	0
Net income	7,884	20,308	52,871	31,960
Net loss from continuing operations attributable to non-controlling interests - consolidated real estate ventures	(58)	(161)	(425)	(221)
Net income attributable to non-controlling interests	(58)	(161)	(425)	(221)
Net income attributable to entity	7,826	20,147	52,446	31,739
Distribution to preferred shareholders	(1,725)	(1,725)	(5,175)	(5,175)
Nonforfeitable dividends allocated to unvested restricted shareholders	(79)	(76)	(263)	(253)
Net income attributable to Common Share/Unit holders of entity	$ 6,022	$ 18,346	$ 47,008	$ 26,311
Basic income per Common Share:
Continuing operations (USD per share)	$ 0.03	$ 0.10	$ 0.27	$ 0.15
Diluted income per Common Share:
Continuing operations (USD per share)	$ 0.03	$ 0.10	$ 0.27	$ 0.15
Basic weighted average shares outstanding (in shares)	175,127,110	178,188,037	174,976,998	179,198,714
Diluted weighted average shares outstanding (in shares)	176,364,615	178,776,684	176,009,822	179,988,492
Distributions declared per Common Share (USD per share)	$ 0.16	$ 0.15	$ 0.47	$ 0.45
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Revenue
Rents	$ 104,537	$ 124,263	$ 318,324	$ 363,800
Tenant reimbursements	17,324	21,553	53,315	64,006
Termination fees	611	1,097	1,459	2,561
Third party management fees, labor reimbursement and leasing	6,248	4,274	17,691	12,805
Other	974	1,398	2,588	5,467
Total revenue	129,694	152,585	393,377	448,639
Operating expenses
Property operating expenses	37,250	43,894	114,208	133,175
Real estate taxes	11,566	13,119	34,933	37,632
Third party management expenses	2,501	1,605	7,172	4,858
Depreciation and amortization	46,956	58,314	142,736	160,355
General and administrative expenses	5,515	6,127	20,711	21,554
Provision for impairment	0	0	13,069	2,508
Total operating expenses	103,788	123,059	332,829	360,082
Operating income	25,906	29,526	60,548	88,557
Other income (expense)
Interest income	291	126	970	1,189
Tax credit transaction income	0	11,853	0	11,853
Interest expense	(20,814)	(27,900)	(64,334)	(83,971)
Interest expense - amortization of deferred financing costs	(645)	(1,010)	(2,063)	(3,377)
Interest expense - financing obligation	(156)	(296)	(679)	(906)
Equity in loss of Real Estate Ventures	(7,254)	(1,093)	(9,323)	(1,835)
Net gain (loss) on disposition of real estate	(104)	6,083	114,625	16,673
Net gain on sale of undepreciated real estate	188	3,019	188	3,019
Net gain from remeasurement of investments in Real Estate Ventures	0	0	0	758
Net gain on Real Estate Venture transactions	10,472	0	19,529	0
Loss on early extinguishment of debt	0	0	(66,590)	0
Net income	7,884	20,308	52,871	31,960
Net loss from continuing operations attributable to non-controlling interests - consolidated real estate ventures	(6)	(1)	(12)	4
Net income attributable to entity	7,878	20,307	52,859	31,964
Distribution to preferred shareholders	(1,725)	(1,725)	(5,175)	(5,175)
Nonforfeitable dividends allocated to unvested restricted shareholders	(79)	(76)	(263)	(253)
Net income attributable to Common Share/Unit holders of entity	$ 6,074	$ 18,506	$ 47,421	$ 26,536
Basic income per Common Share:
Continuing operations (USD per share)	$ 0.03	$ 0.10	$ 0.27	$ 0.15
Diluted income per Common Share:
Continuing operations (USD per share)	$ 0.03	$ 0.10	$ 0.27	$ 0.15
Basic weighted average shares outstanding (in shares)	176,606,909	179,723,139	176,491,311	180,733,816
Diluted weighted average shares outstanding (in shares)	177,844,414	180,311,786	177,524,135	181,523,594
Distributions declared per Common Share (USD per share)	$ 0.16	$ 0.15	$ 0.47	$ 0.45

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Net income		$ 7,884	$ 20,308	$ 52,871	$ 31,960
Comprehensive income:
Unrealized gain (loss) on derivative financial instruments		2,454	(2,922)	(10,764)	(4,091)
Reclassification of realized losses on derivative financial instruments to operations, net	[1]	286	58	818	174
Total comprehensive income (loss)		2,740	(2,864)	(9,946)	(3,917)
Comprehensive income		10,624	17,444	42,925	28,043
Comprehensive income attributable to non-controlling interest		(81)	(136)	(339)	(187)
Comprehensive income attributable to reporting entity		10,543	17,308	42,586	27,856
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Net income		7,884	20,308	52,871	31,960
Comprehensive income:
Unrealized gain (loss) on derivative financial instruments		2,454	(2,922)	(10,764)	(4,091)
Reclassification of realized losses on derivative financial instruments to operations, net	[1]	286	58	818	174
Total comprehensive income (loss)		2,740	(2,864)	(9,946)	(3,917)
Comprehensive income		10,624	17,444	42,925	28,043
Comprehensive income attributable to non-controlling interest		(6)	0	(12)	0
Comprehensive income attributable to reporting entity		$ 10,618	$ 17,444	$ 42,913	$ 28,043
[1]	Amounts reclassified from comprehensive income to interest expense within the Consolidated Statements of Operations.

Consolidated Statements of Bene

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, 2014		4,000,000	179,293,160	384,536
Beginning Balance at Dec. 31, 2014	$ 2,159,326	$ 40	$ 1,793	$ 6,219	$ 3,314,693	$ (6,219)	$ 529,487	$ (4,607)	$ (1,700,579)	$ 18,499
Net income	31,960						31,739			221
Other comprehensive loss	$ (3,917)							(3,883)		(34)
Repurchase and retirement of Common Shares of Beneficial Interest, Shares	(4,701,302)		(4,701,302)
Repurchase and retirement of Common Shares of Beneficial Interest	$ (60,817)		$ (47)		(60,770)
Issuance of partnership interest in joint venture	1,025									1,025
Bonus share issuance, Shares			8,447
Bonus share issuance	125				125
Equity issuance costs	(100)				(100)
Share-based compensation activity, Shares			509,675	280,011
Share-based compensation activity	4,043		$ 6		4,036		1
Share Issuance from/to Deferred Compensation Plan, Shares			86,723	81,139
Share Issuance from/(to) Deferred Compensation Plan	(2)			$ 5,699	(2)	(5,699)
Adjustment to Non-controlling Interest	0				93					(93)
Distribution to preferred shareholders	(5,175)								(5,175)
Distributions declared	(81,311)								(80,620)	(691)
Ending Balance, Shares at Sep. 30, 2015		4,000,000	175,196,703	745,686
Ending Balance at Sep. 30, 2015	2,045,157	$ 40	$ 1,752	$ 11,918	3,258,075	(11,918)	561,227	(8,490)	(1,786,374)	18,927
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	52,871						52,446			425
Other comprehensive loss	$ (9,946)							(9,860)		(86)
Repurchase and retirement of Common Shares of Beneficial Interest, Shares	0
Repurchase and retirement of Common Shares of Beneficial Interest	$ (67,300)
Issuance of partnership interest in consolidated real estate venture	73									73
Conversion of LP Units to Common Shares, Shares			55,303
Conversion of LP Units to Common Shares	0		$ 1		874					(875)
Share-based compensation activity, Shares			405,200
Share-based compensation activity	4,934		$ 4		4,890		40
Share Issuance from/to Deferred Compensation Plan, Shares			(8,311)	153,771
Share Issuance from/(to) Deferred Compensation Plan	(47)			$ 1,766	(47)	(1,766)
Adjustment to Non-controlling Interest	0				(290)					290
Distribution to preferred shareholders	(5,175)								(5,175)
Distributions declared	(83,227)								(82,523)	(704)
Ending Balance, Shares at Sep. 30, 2016		4,000,000	175,140,760	899,457
Ending Balance at Sep. 30, 2016	$ 1,911,574	$ 40	$ 1,752	$ 13,684	$ 3,258,049	$ (13,684)	$ 551,572	$ (15,052)	$ (1,902,076)	$ 17,289

Consolidated Statements of Ben7

Consolidated Statements of Beneficiaries' Equity (Parenthetical) - $ / shares	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Dividends declared (USD per share)	$ 0.47	$ 0.45
Cumulative Distributions [Member]
Dividends declared (USD per share)	0.47	0.45
Noncontrolling Interest [Member]
Dividends declared (USD per share)	$ 0.47	$ 0.45

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities:
Net income	$ 52,871	$ 31,960
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	142,736	160,355
Amortization of deferred financing costs	2,063	3,377
Amortization of debt discount/(premium), net	1,108	(507)
Amortization of stock compensation costs	3,612	4,312
Shares used for employee taxes upon vesting of share awards	(879)	(2,056)
Straight-line rent income	(22,049)	(17,579)
Amortization of acquired above (below) market leases, net	(5,090)	(5,473)
Straight-line ground rent expense	66	66
Provision for doubtful accounts	573	1,276
Net gain on real estate venture transactions	(19,529)	0
Net gain on sale of interests in real estate	(114,813)	(19,692)
Net gain from remeasurement of investment in real estate ventures	0	(758)
Loss on early extinguishment of debt - deferred financing costs	13,157	0
Provision for impairment	13,069	2,508
Tax credit transaction income	0	(11,853)
Real Estate Venture loss in excess of distributions	9,945	2,579
Deferred financing obligation	(681)	(906)
Changes in assets and liabilities:
Accounts receivable	4,041	(1,008)
Other assets	(10,332)	(9,511)
Accounts payable and accrued expenses	7,163	13,819
Deferred income, gains and rent	(2,000)	(3,491)
Other liabilities	318	(2,458)
Net cash provided by operating activities	75,349	144,960
Cash flows from investing activities:
Acquisition of properties	(20,406)	(141,303)
Acquisition of property - 1031 exchange funds applied	0	(62,812)
Proceeds from the sale of properties	758,931	152,243
Sale of property - 1031 exchange funds held in escrow	0	62,800
Distribution of sale proceeds from a real estate venture	20,551	0
Issuance of mortgage note receivable	(3,365)	0
Proceeds from repayment of mortgage notes receivable	0	88,000
Capital expenditures for tenant improvements	(37,991)	(56,095)
Capital expenditures for redevelopments	(10,852)	(38,925)
Capital expenditures for developments	(147,831)	(122,380)
Advances for the purchase of tenant assets, net of repayments	275	290
Investment in unconsolidated Real Estate Ventures	(27,174)	(62,868)
Deposits for real estate	(746)	(451)
Escrowed cash	6,993	1,004
Cash distribution from unconsolidated Real Estate Ventures in excess of cumulative equity income	12,565	7,401
Leasing costs paid	(12,884)	(18,295)
Net cash provided by (used in) investing activities	538,066	(191,391)
Cash flows from financing activities:
Proceeds from mortgage notes payable	86,900	0
Repayments of mortgage notes payable	(302,514)	(10,598)
Proceeds from credit facility borrowings	195,000	0
Repayments of credit facility borrowings	(195,000)	0
Repayments of unsecured notes	(149,919)	0
Debt financing costs paid	(477)	(3,229)
Proceeds from the exercise of stock options	1,286	127
Partner contributions to consolidated real estate venture	73	1,025
Repurchase and retirement of common shares	0	(60,817)
Distributions paid to shareholders	(85,702)	(86,255)
Distributions to non-controlling interest	(697)	(692)
Net cash used in financing activities	(451,050)	(160,439)
Increase in cash and cash equivalents	162,365	(206,870)
Cash and cash equivalents at beginning of year	56,694	257,502
Cash and cash equivalents at end of period	219,059	50,632
Supplemental disclosure:
Cash paid for interest, net of capitalized interest during the nine months ended September 30, 2016 and 2015 of $10,023 and $8,764, respectively	64,046	80,720
Supplemental disclosure of non-cash activity:
Change in real estate investments related to non-cash property acquisition	0	(67,261)
Change in investments in joint venture related to non-cash property acquisition	0	67,261
Dividends and distributions declared but not paid	30,036	28,318
Change in investment in real estate ventures as a result of dispositions	2,023	0
Change in investment in real estate ventures related to non-cash disposition of property	25,165	0
Change in other liabilities from contingent consideration related to a business combination	0	1,585
Change in operating real estate from contingent consideration related to a business combination	0	(1,585)
Change in other liabilities from a deferred payment related to an asset acquisition	0	2,000
Change in operating real estate from a deferred payment related to an asset acquisition	0	(2,000)
Change in operating real estate from deconsolidation of 3141 Fairview Park Drive	44,313	0
Change in investment in real estate ventures from deconsolidation of 3141 Fairview Park Drive	(12,642)	0
Change in mortgage notes payable from deconsolidation of 3141 Fairview Park Drive	(20,582)	0
Change in other liabilities from deconsolidation of 3141 Fairview Park Drive	(12,384)	0
Change in capital expenditures financed through accounts payable at period end	(5,012)	(2,472)
Change in capital expenditures financed through retention payable at period end	2,487	6,873
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Cash flows from operating activities:
Net income	52,871	31,960
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	142,736	160,355
Amortization of deferred financing costs	2,063	3,377
Amortization of debt discount/(premium), net	1,108	(507)
Amortization of stock compensation costs	3,612	4,312
Shares used for employee taxes upon vesting of share awards	(879)	(2,056)
Straight-line rent income	(22,049)	(17,579)
Amortization of acquired above (below) market leases, net	(5,090)	(5,473)
Straight-line ground rent expense	66	66
Provision for doubtful accounts	573	1,276
Net gain on real estate venture transactions	(19,529)	0
Net gain on sale of interests in real estate	(114,813)	(19,692)
Net gain from remeasurement of investment in real estate ventures	0	(758)
Loss on early extinguishment of debt - deferred financing costs	13,157	0
Provision for impairment	13,069	2,508
Tax credit transaction income	0	(11,853)
Real Estate Venture loss in excess of distributions	9,945	2,579
Deferred financing obligation	(681)	(906)
Changes in assets and liabilities:
Accounts receivable	4,041	(1,008)
Other assets	(10,332)	(9,511)
Accounts payable and accrued expenses	7,163	13,819
Deferred income, gains and rent	(2,000)	(3,491)
Other liabilities	318	(2,458)
Net cash provided by operating activities	75,349	144,960
Cash flows from investing activities:
Acquisition of properties	(20,406)	(141,303)
Acquisition of property - 1031 exchange funds applied	0	(62,812)
Proceeds from the sale of properties	758,931	152,243
Sale of property - 1031 exchange funds held in escrow	0	62,800
Distribution of sale proceeds from a real estate venture	20,551	0
Issuance of mortgage note receivable	(3,365)	0
Proceeds from repayment of mortgage notes receivable	0	88,000
Capital expenditures for tenant improvements	(37,991)	(56,095)
Capital expenditures for redevelopments	(10,852)	(38,925)
Capital expenditures for developments	(147,831)	(122,380)
Advances for the purchase of tenant assets, net of repayments	275	290
Investment in unconsolidated Real Estate Ventures	(27,174)	(62,868)
Deposits for real estate	(746)	(451)
Escrowed cash	6,993	1,004
Cash distribution from unconsolidated Real Estate Ventures in excess of cumulative equity income	12,565	7,401
Leasing costs paid	(12,884)	(18,295)
Net cash provided by (used in) investing activities	538,066	(191,391)
Cash flows from financing activities:
Proceeds from mortgage notes payable	86,900	0
Repayments of mortgage notes payable	(302,514)	(10,598)
Proceeds from credit facility borrowings	195,000	0
Repayments of credit facility borrowings	(195,000)	0
Repayments of unsecured notes	(149,919)	0
Debt financing costs paid	(477)	(3,229)
Proceeds from the exercise of stock options	1,286	127
Partner contributions to consolidated real estate venture	73	1,025
Repurchase and retirement of common shares	0	(60,817)
Distributions paid to shareholders	(86,399)	(86,947)
Net cash used in financing activities	(451,050)	(160,439)
Increase in cash and cash equivalents	162,365	(206,870)
Cash and cash equivalents at beginning of year	56,694	257,502
Cash and cash equivalents at end of period	219,059	50,632
Supplemental disclosure:
Cash paid for interest, net of capitalized interest during the nine months ended September 30, 2016 and 2015 of $10,023 and $8,764, respectively	64,046	80,720
Supplemental disclosure of non-cash activity:
Change in real estate investments related to non-cash property acquisition	0	(67,261)
Change in investments in joint venture related to non-cash property acquisition	0	67,261
Dividends and distributions declared but not paid	30,036	28,318
Change in investment in real estate ventures as a result of dispositions	2,023	0
Change in investment in real estate ventures related to non-cash disposition of property	25,165	0
Change in other liabilities from contingent consideration related to a business combination	0	1,585
Change in operating real estate from contingent consideration related to a business combination	0	(1,585)
Change in other liabilities from a deferred payment related to an asset acquisition	0	2,000
Change in operating real estate from a deferred payment related to an asset acquisition	0	(2,000)
Change in operating real estate from deconsolidation of 3141 Fairview Park Drive	44,313	0
Change in investment in real estate ventures from deconsolidation of 3141 Fairview Park Drive	(12,642)	0
Change in mortgage notes payable from deconsolidation of 3141 Fairview Park Drive	(20,582)	0
Change in other liabilities from deconsolidation of 3141 Fairview Park Drive	(12,384)	0
Change in capital expenditures financed through accounts payable at period end	(5,012)	(2,472)
Change in capital expenditures financed through retention payable at period end	$ 2,487	$ 6,873

Consolidated Statements of Cas9

Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Supplemental disclosure:
Capitalized interest	$ 10,023	$ 8,764
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Supplemental disclosure:
Capitalized interest	$ 10,023	$ 8,764

Consolidated Statements of Part

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, 2014		$ 2,134,755	$ 2,041,902	$ 96,850		$ (5,007)		$ 1,010
Beginning Balance, Shares at Dec. 31, 2014			179,293,160	4,000,000
Net income	$ 31,960	31,960	$ 31,964				$ 221	(4)
Other comprehensive loss	(3,917)	(3,917)			$ (3,883)	(3,917)	(34)
Share Issuance from/(to) Deferred Compensation Plan	(2)	(2)	$ (2)
Share Issuance from/to Deferred Compensation Plan, Shares			86,723
Issuance of partnership interest in consolidated real estate venture		1,025						1,025
Repurchase and retirement of LP Units		(60,817)	$ (60,817)
Repurchase and retirement of LP units, Shares			(4,701,302)
Bonus share issuance	125
Bonus share issuance, Shares			8,447
Equity issuance costs	(100)	(100)	$ (100)
Share-based compensation activity	4,043	4,042	$ 4,042
Share-based compensation activity, Shares			509,675
Adjustment of redeemable partnership units to liquidation value at period end		1,634	$ 1,634
Distribution to preferred shareholders	(5,175)	(5,175)	(5,175)
Distributions to general partnership unitholders		(80,620)	(80,620)
Ending Balance at Sep. 30, 2015		2,022,910	$ 1,932,953	$ 96,850		(8,924)		2,031
Ending Balance, Shares at Sep. 30, 2015			175,196,703	4,000,000
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	52,871	52,871	$ 52,859				425	12
Other comprehensive loss	(9,946)	(9,946)			$ (9,860)	(9,946)	(86)
Share Issuance from/(to) Deferred Compensation Plan	(47)	(47)	$ (47)
Share Issuance from/to Deferred Compensation Plan, Shares			(8,311)
Issuance of partnership interest in consolidated real estate venture	73	73					73	73
Conversion of LP Units to Common Shares	0	875	$ 875				$ (875)
Conversion of LP Units to Common Shares, Shares			55,303
Share-based compensation activity	4,934	4,929	$ 4,929
Share-based compensation activity, Shares			405,200
Adjustment of redeemable partnership units to liquidation value at period end		(1,935)	$ (1,935)
Redemption value of limited partnership units		(875)	(875)
Distribution to preferred shareholders	$ (5,175)	(5,175)	(5,175)
Distributions to general partnership unitholders		(82,524)	(82,524)
Ending Balance at Sep. 30, 2016		$ 1,888,223	$ 1,804,799	$ 96,850		$ (15,543)		$ 2,117
Ending Balance, Shares at Sep. 30, 2016			175,140,760	4,000,000

Consolidated Statements of Pa11

Consolidated Statements of Partners' Equity (Parenthetical) - BRANDYWINE OPERATING PARTNERSHIP, L.P. - $ / shares	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Distributions to general partnership unitholders (USD per share)	$ 0.47	$ 0.45
General Partner Capital [Member]
Distributions to general partnership unitholders (USD per share)	$ 0.47	$ 0.45

Organization of the Parent Comp

Organization of the Parent Company and The Operating Partnership	9 Months Ended
	Sep. 30, 2016
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, 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 September 30, 2016, owned a 99.1% 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 September 30, 2016, the Company owned 117 properties that contain an aggregate of approximately 17.8 million net rentable square feet and consist of 99 office properties, seven mixed-use properties, one retail property (107 properties, collectively the “Core Properties”), four development properties, two redevelopment properties and four properties classified as held for sale (collectively, the “Properties”). In addition, as of September 30, 2016, the Company owned economic interests in 14 unconsolidated real estate ventures (collectively, the “Real Estate Ventures”), of which seven own properties that contain approximately 8.0 million net rentable square feet of office space; two own 4.3 acres of undeveloped parcels of land; two own 1.4 acres of land under active development; two own residential towers that contain 345 and 321 apartment units, respectively, and one owns an apartment complex that contains 398 units. As of September 30, 2016, the Company also owned 317 acres of undeveloped land and held options to purchase parcels containing approximately 60 additional acres of undeveloped land. As of September 30, 2016, the total potential development that these land parcels could support, including the parcels under option, under current zoning and entitlements, amounted to an estimated 12.3 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; Austin, Texas and Oakland and Concord, California. In addition to managing properties that the Company owns, as of September 30, 2016, the Company was managing approximately 10.9 million net rentable square feet of office and industrial properties for third parties and Real Estate Ventures. Prior to the MAP Venture formation on February 4, 2016 (See Note 4, “ Investment in Unconsolidated Real Estate Ventures The Company conducts its third-party real estate management services business primarily through wholly-owned management company subsidiaries. As of September 30, 2016, the management company subsidiaries were managing properties containing an aggregate of approximately 28.7 million net rentable square feet, of which approximately 17.8 million net rentable square feet related to Properties owned by the Company and approximately 10.9 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

Basis of Presentation	9 Months Ended
	Sep. 30, 2016
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 September 30, 2016, the results of its operations for the three and nine-month periods ended September 30, 2016 and 2015 and its cash flows for the nine-month periods ended September 30, 2016 and 2015 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 2015 Annual Report on Form 10-K filed with the SEC on February 29, 2016. On January 1, 2016, the Company adopted accounting guidance under Accounting Standards Codification (ASC) Topic 810, "Consolidation,” modifying the analysis it must perform to determine whether it should consolidate certain types of legal entities. The guidance does not amend the existing disclosure requirements for variable interest entities (“VIEs”) or voting interest model entities. The guidance, however, modified the requirements to qualify under the voting interest model. Under the revised guidance, the Operating Partnership is a variable interest entity of the Parent Company. As the Operating Partnership is already consolidated in the balance sheets of the Parent Company, the identification of this entity as a variable interest entity has no impact on the consolidated financial statements of the Parent Company. There were no other legal entities qualifying under the scope of the revised guidance that were consolidated as a result of the adoption of this guidance. In addition, there were no other voting interest entities under prior existing guidance determined to be variable interest entities under the revised guidance. The Company's Annual Report on Form 10-K for the year ended December 31, 2015 contains a discussion of our significant accounting policies under Note 2, "Summary of Significant Accounting Policies". Recent Accounting Pronouncements In August 2016, the Financial Accounting Standards Board (FASB) issued guidance intended to reduce diversity in practice in how certain transactions are classified in the statement of cash flows. The areas addressed in the new guidance related to debt prepayment costs, settlement of zero-coupon debt instruments, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, proceeds from the settlement of corporate-owned and bank-owned life insurance policies, distributions received from equity method investments, beneficial interest in securitization transactions, and separately identifiable cash flows and application of the predominance principle. The standard is effective for financial statements issued for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted, provided that all of the amendments are adopted in the same period. The guidance requires application using a retrospective transition method. The Company is in the process of determining the impact, if any, that the adoption will have on its consolidated financial statements. In June 2016, the FASB issued guidance that changes how entities measure credit losses for most financial assets and certain other instruments that are not measured at fair value through net income. The guidance replaces the current incurred loss model with an expected loss approach, resulting in a more timely recognition of such losses. The guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted after December 2018. The Company is in the process of evaluating the impact of this new guidance and has not yet determined the impact, if any, that the adoption of this guidance will have on its consolidated financial statements. In May 2016, the FASB issued guidance amending the revenue from contracts with customers standard issued in May 2014 (and not yet effective). The amendments are intended to address implementation issues that were raised by stakeholders and discussed by the Joint Transition Resource Group, and provide additional practical expedients on collectability, noncash consideration, presentation of sales tax and contract modifications and completed contracts at transition. In accordance with the FASB election to defer the effective date of the revenue recognition standard by one year, reporting entities may choose to adopt the standard as of its original effective date or for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2017. Calendar year-end reporting entities are therefore required to apply the new revenue guidance beginning in their 2018 interim and annual financial statements. In March 2016, the FASB issued guidance intended to simplify various aspects related to how share-based payments are accounted for and presented in the financial statements. The new guidance allows for entities to make an entity-wide accounting policy election to either estimate the number of awards that are expected to vest or account for forfeitures when they occur. In addition, the guidance allows employers to withhold shares to satisfy minimum statutory tax withholding requirements up to the employees’ maximum individual tax rate without causing the award to be classified as a liability. The guidance also stipulates that cash paid by an employer to a taxing authority when directly withholding shares for tax-withholding purposes should be classified as a financing activity on the statement of cash flows. This guidance is effective for annual reporting periods beginning after December 15, 2016, and interim periods within that reporting period. Early adoption is permitted in any interim or annual period, with any adjustments reflected as of the beginning of the fiscal year of adoption. The Company is in the process of evaluating the impact of this new guidance and has not yet determined the impact, if any, that the adoption of this guidance will have on its consolidated financial statements. Also in March 2016, the FASB issued guidance clarifying that a novation of party to a derivative instrument, whereby one of the parties to a derivative instrument is replaced with another party, does not, in and of itself, require de-designation of that hedging relationship provided that all other hedge criteria continue to be met. The guidance is effective for financial statements issued for fiscal years beginning after December 15, 2016, and interim periods within those fiscal years. An entity has an option to apply the amendments either on a prospective basis or on a modified retrospective basis. The Company is in the process of evaluating the impact of this new guidance and has not yet determined the impact, if any, that the adoption of this guidance will have on its consolidated financial statements. In February 2016, the FASB issued guidance modifying the principles for the recognition, measurement, presentation and disclosure of leases for both parties to a contract (i.e. lessees and lessors). The new standard requires lessees to apply a dual approach, classifying leases as either finance or operating leases based on the principle of whether or not the lease is effectively a financed purchase by the lessee. This classification will determine whether lease expense is recognized based on an effective interest method or on a straight line basis over the term of the lease, respectively. A lessee is also required to record a right-of-use asset and a lease liability for all leases with a term of greater than 12 months regardless of their classification. Leases with a term of 12 months or less will be accounted for in the same manner as operating leases today. The new standard requires lessors to account for leases using an approach that is substantially equivalent to existing guidance for sales-type leases, direct financing leases and operating leases. The guidance supersedes previously issued guidance under ASC Topic 840 “Leases.” The guidance is effective on January 1, 2019, with early adoption permitted. The Company is in the process of evaluating the impact of this new guidance and has not yet determined the impact, if any, that the adoption of this guidance will have on its consolidated financial statements. In August 2014, the FASB issued guidance regarding an Entity’s Ability to Continue as a Going Concern, which requires management to assess a company’s ability to continue as a going concern and to provide related footnote disclosures in certain circumstances. Before this new standard, there was minimal guidance in U.S. GAAP specific to going concern. Under the new standard, disclosures are required when conditions give rise to substantial doubt about a company’s ability to continue as a going concern within one year from the financial statement issuance date. The guidance is effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period, with early adoption permitted. The Company has not yet determined the impact, if any, that the adoption of this guidance will have on its consolidated financial statements. In May 2014, the FASB issued the revenue from contracts with customers standard requiring revenue to be recognized in an amount that reflects the consideration expected to be received in exchange for goods and services. The standard requires the disclosure of sufficient quantitative and qualitative information for financial statement users to understand the nature, amount, timing and uncertainty of revenue and associated cash flows arising from contracts with customers. On July 9, 2015, the FASB elected to defer the effective date of this revenue recognition standard by one year. Reporting entities may choose to adopt the standard as of the original effective date or for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2017. Calendar year-end reporting entities are therefore required to apply the new revenue guidance beginning in their 2018 interim and annual financial statements. The Company is in the process of evaluating the impact of this new standard and has not yet determined the impact, if any, that the adoption of this standard will have on its consolidated financial statements.

Real Estate Investments

Real Estate Investments	9 Months Ended
	Sep. 30, 2016
Real Estate [Abstract]
REAL ESTATE INVESTMENTS	3. REAL ESTATE INVESTMENTS As of September 30, 2016 and December 31, 2015, the gross carrying value of the Properties were as follows (in thousands): September 30, December 31, 2016 2015 Land $ 488,580 $ 513,268 Building and improvements 2,561,976 2,719,780 Tenant improvements 635,783 459,952 Operating properties 3,686,339 3,693,000 Assets held for sale - real estate investments 16,916 794,588 Total $ 3,703,255 $ 4,487,588 Acquisitions 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 for a gross purchase price of $20.6 million. The Company accounted for this transaction as an asset acquisition and capitalized approximately $1.9 million of acquisition related costs and closing costs as part of land held for development on its consolidated balance sheet. The acquisition was funded with $20.4 million of available corporate funds, net of prorations and other adjustments. The Company is currently under agreement to sell 9.5 acres (of the 34.6 acres) to two unaffiliated third parties. As of September 30, 2016, the land under agreement of sale did not meet the criteria to be classified as held for sale due to the Company’s continuing involvement through a completion guaranty, which requires the Company, as developer, to complete infrastructure improvements on behalf of the buyers of the land parcels. Dispositions The Company sold the following office properties during the nine-month period ended September 30, 2016 (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) September 1, 2016 1120 Executive Plaza Mt. Laurel, NJ 1 95,183 $ 9,500 $ 9,241 $ (18 ) (b) August 2, 2016 50 East Clementon Road Gibbsboro, NJ 1 3,080 1,100 1,011 (85 ) May 11, 2016 196/198 Van Buren Street (Herndon Metro Plaza I&II) Herndon, VA 2 197,225 44,500 43,412 (752 ) (c) February 5, 2016 2970 Market Street (Cira Square) Philadelphia, PA 1 862,692 354,000 350,150 115,828 February 4, 2016 Och-Ziff Portfolio Various (d) 58 3,924,783 398,100 353,971 (372 ) (e) Total Dispositions 63 5,082,963 $ 807,200 $ 757,785 $ 114,601 (a) Gain/(Loss) on Sale is net of closing and other transaction related costs. (b) As of June 30, 2016, the Company determined that the sale of the property was probable and classified this property as held for sale in accordance with applicable accounting standards for long lived assets. At such date, the carrying value of the property exceeded the fair value less the anticipated costs of sale. As a result, the Company recognized a provision for impairment totaling approximately $1.8 million during the three-month period ended June 30, 2016. The fair value measurement was based on the pricing in the purchase and sale agreement. As the pricing in the purchase and sale agreement is unobservable, the Company determined that the inputs utilized to determine fair value for this property falls within Level 3 in accordance with the fair value hierarchy established by "Fair Value Measurements and Disclosures.” The loss on sale represents additional closing costs recognized at settlement (c ) During the three-month period ended March 31, 2016, the Company recognized a provision for impairment totaling approximately $7.4 million on the properties. See “Held for Use Impairment” section below. The loss on sale primarily relates to additional closing costs recognized at settlement . ( d ) Exhibit 99.2 to the Company’s Current Report on Form 8-K filed on February 10, 2016 contains a complete list of the 58 properties disposed of in the transactions with Och-Ziff Capital Management Group LLC. See Note 4, " Investment in Unconsolidated Real Estate Ventures ," for further details of the transactions. ( e ) During the three-month period ended December 31, 2015, the Company recognized a provision for impairment totaling approximately $45.4 million. The loss on sale represents additional closing costs recognized at settlement. On August 19, 2016, the Company sold two acres of undeveloped land located in Mt. Laurel, New Jersey for a sales price of $0.3 million. The Company received proceeds of $0.3 million at closing and recognized a $0.2 million gain on the sale. On January 15, 2016, the Company sold 120 acres of undeveloped land located in Berks County Pennsylvania for a sales price of $0.9 million. The land was classified as held for sale as of December 31, 2015. The carrying value of the land exceeded the fair value less the anticipated costs of sale as of December 31, 2015, therefore the Company recognized an impairment loss of $0.3 million during the three-month period ended December 31, 2015. There was no gain or loss recognized on the sale during 2016. The sales of the office properties and land referenced above do not represent a strategic shift that has a major effect on the Company's operations and financial results. The operating results of these properties remain classified within continuing operations for all periods presented. Held for Use Impairment During the three-month period ended September 30, 2016, the Company evaluated the recoverability of the carrying value of its properties that triggered assessment. Based on the analysis, no impairment charges were identified. During the three-month period ended June 30, 2016, the Company evaluated the recoverability of the carrying value of its properties that triggered assessment under the undiscounted cash flow model. Based on the analysis, it was determined that due to the reduction in management’s intended hold period of a property located in the Metropolitan D.C. segment, the Company would not recover the carrying value of that property. Accordingly, the Company recorded an impairment charge on the property of $3.9 million at June 30, 2016, reducing the aggregate carrying value of the property from $37.4 million to its estimated fair value of $33.5 million. The Company measured this impairment based on a discounted cash flow analysis, using a hold period of 10 years and residual capitalization rate and discount rate of 7.75% and 8.25%, respectively. The results were compared 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 During the three-month period ended March 31, 2016, the Company evaluated the recoverability of the carrying value of the properties that triggered assessment under the undiscounted cash flow model. Based on the analysis, it was determined that due to a reduction in management’s intended hold period, the Company would not recover the carrying value of two properties located in its Metropolitan D.C. segment. Accordingly, the Company recorded an impairment charge of Fair Value Measurements and Disclosures Held for Sale The following is a summary of properties classified as held for sale but which did not meet the criteria to be classified within discontinued operations at September 30, 2016 (in thousands): Held for Sale Properties Included in Continuing Operations September 30, 2016 620, 640 and 660 Allendale Road Oakland Lot B Total ASSETS HELD FOR SALE Real estate investments: Operating properties $ 12,550 $ 4,366 $ 16,916 Accumulated depreciation (4,520 ) (4 ) (4,524 ) Operating real estate investments, net 8,030 4,362 12,392 Construction-in-progress 212 - 212 Total real estate investments, net 8,242 4,362 12,604 Other assets - - - Total assets held for sale, net $ 8,242 $ 4,362 $ 12,604 LIABILITIES HELD FOR SALE Other liabilities $ 49 $ - $ 49 Total liabilities held for sale $ 49 $ - $ 49 As the fair value less anticipated costs to sell exceeded the carrying value for each of the properties included in the above table no impairment loss was recorded. The fair value measurements are based on pricing in the purchase and sale agreements for each of the properties. As the pricing in the purchase and sales agreements are unobservable, the Company determined that the input utilized to determine fair value for these properties 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 sales of the office properties and land referenced above as held for sale do not represent a strategic shift that has a major effect on the Company's operations and financial results. The operating results of these properties remain classified within continuing operations for all periods presented.

Investment in Unconsolidated Re

Investment in Unconsolidated Real Estate Ventures	9 Months Ended
	Sep. 30, 2016
Equity Method Investments And Joint Ventures [Abstract]
INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES	4. INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES As of September 30, 2016, the Company held ownership interests in 14 unconsolidated Real Estate Ventures for an aggregate investment balance of $282.2 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 September 30, 2016, 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; two real estate ventures owned residential towers that contain 345 and 321 apartment units, respectively, and one real estate venture owned an apartment complex that contains 398 units. 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 $6.2 million and $17.7 million for the three- and nine-month periods ended September 30, 2016 and $4.3 million and $12.8 million for the three- and nine-month periods ended September 30, 2015, respectively. The Company has outstanding accounts receivable balances from its Real Estate Ventures of $1.1 million and $1.7 million as of September 30, 2016 and December 31, 2015, 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 as of September 30, 2016 and December 31, 2015 (in thousands): September 30, 2016 December 31, 2015 Net property $ 1,463,500 $ 1,258,999 Other assets 270,892 158,672 Other liabilities 124,949 69,028 Debt, net 1,007,062 794,571 Equity 602,381 554,072 Company’s share of equity (Company’s basis) (a) (b) $ 282,162 $ 241,004 (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. (b ) Does not include the negative investment balance in one real estate venture totaling $1.1 million as of December 31, 2015, which is included in other liabilities. There is no negative investment balance as of September 30, 2016 because the Company sold its entire remaining 50% interest in the applicable real estate venture (See “ Coppell Associates ” section below) during the three month period ended March 31, 2016. The following is a summary of results of operations of the Real Estate Ventures in which the Company had interests during the three- and nine-months periods ended September 30, 2016 and 2015 (in thousands): Three-month periods ended September 30, Nine-month periods ended September 30, 2016 2015 2016 2015 Revenue $ 57,710 $ 37,076 $ 157,641 $ 126,424 Operating expenses (27,592 ) (16,917 ) (81,347 ) (54,581 ) Provision for impairment (a) (10,476 ) - (10,476 ) - Interest expense, net (12,102 ) (7,936 ) (32,019 ) (27,918 ) Depreciation and amortization (22,722 ) (15,681 ) (63,125 ) (52,218 ) Net loss (b) $ (15,182 ) $ (3,458 ) $ (29,326 ) $ (8,293 ) Equity in loss of Real Estate Ventures $ (7,254 ) $ (1,093 ) $ (9,323 ) $ (1,835 ) (a) During the period ended September 30, 2016, Brandywine-AI Venture LLC recorded a property level impairment charge of $10.4 million. See additional details in the “Station Square Impairment” disclosure below. (b) The nine-month period ended September 30, 2016 amount includes $7.1 million of acquisition deal costs related to the formation of the MAP Venture during the three-month period ended March 31, 2016. Brandywine AI Venture: 3141 Fairview Park Drive On December 20, 2011, the Company formed a real estate venture, Brandywine - AI Venture LLC, (the "Venture"), with Current Creek Investments, LLC ("Current Creek"), a wholly-owned subsidiary of Allstate Insurance Company. The Company and Current Creek each own a 50% interest in the Venture. The Venture owned three office properties, which the Company contributed to the Venture upon its formation. The contributed office properties contain an aggregate of 587,317 net rentable square feet and consist of 3130 and 3141 Fairview Park Drive, both located in Falls Church, Virginia, and 7101 Wisconsin Avenue located in Bethesda, Maryland. The Company maintained a regional management and leasing office at 3141 Fairview Park Drive. Consistent with the other four properties in the Venture, financial control was shared, however, pursuant to the accounting standard for sales-leaseback transactions, the lease maintained by the Company at 3141 Fairview Park Drive resulted in the Company having continuing involvement that required 3141 Fairview Park Drive and its related operations to be consolidated by the Company under the financing method of accounting for sales of real estate. At formation, the Company concluded under ASC 810, Consolidations On August 31, 2016, the Company terminated its lease for the regional management and leasing office at 3141 Fairview Park Drive. Accordingly, the Company no longer has any continuing involvement with 3141 Fairview Park Drive and recorded the partial sale under the full accrual method of accounting. As a result of the sale accounting, the Company deconsolidated net assets of $45.6 million, a mortgage loan of $20.6 million and a financing liability of $12.4 million related to the property from its consolidated balance sheet and recorded a $12.6 million equity method investment. Upon recognizing the sale, there was no gain or loss, as 3141 Fairview Park Drive was impaired to its fair value during the second quarter of 2016. On September 30, 2016, the Company funded a capital call totaling $10.3 million to the Venture for its share of the mortgage debt on 3141 Fairview Park Drive. Subsequently, the Venture funded $20.6 million for the repayment of its mortgage debt. The Company determined that the partial sale recognition does not have an impact on the accounting standard for VIE’s because the underlying real estate venture agreements are unchanged. The Venture is not a VIE in accordance with the accounting standard for the consolidation of VIEs. As a result, the Company continues to use the voting interest model under the accounting standard for consolidation in order to determine whether to consolidate the Venture. Based upon each member’s substantive participating rights over the activities of the Venture under its operating and related agreements, it is not consolidated by the Company, and is accounted for under the equity method of accounting. Brandywine AI Venture: Station Square Impairment On July, 10, 2012, Brandywine – AI Venture (the “Venture”), an unconsolidated real estate venture which the Company owns a 50% interest, acquired a three building office portfolio totaling 497,896 net rentable square feet in Silver Spring, Maryland (“Station Square”) valued at $120.6 million. During the period ended September 30, 2016, the Venture recorded a $10.4 million held for use impairment charge related to Station Square, which is included in the Company’s Metropolitan D.C. segment. The Company's share of this impairment charge was $5.2 million and is reflected in equity in loss of unconsolidated real estate ventures for the period ended September 30, 2016. The fair value of the Station Square properties was primarily determined based on offers received for the properties. The remaining properties in the real estate venture were evaluated for impairment, and based on an undiscounted cash flow analysis, identified no additional other than temporary impairment. All of the inputs used to determine the above-mentioned impairment charges are categorized Level 3, as previously defined. The Company evaluated for other than temporary impairment in its investment in the Venture in accordance with ASC 323, Investments - Equity Method and Joint Ventures PJP V On September 22, 2016, the real estate venture known as PJV V sold its office property, comprised of 73,997 square feet, located in Charlottesville, Virginia. Also on September 22, 2016, using proceeds from the sale, the Company liquidated its entire 25% interest in the real estate venture for $3.4 million, net of closing costs. The carrying amount of the Company’s investment was $0.2 million at the time of sale, resulting in a recognized gain of $3.2 million related to the disposition. Invesco Venture On August 19, 2016, the Company assigned its residual profits interest in an unconsolidated real estate venture known as Invesco, L.P. to the general partner of Invesco L.P., an unaffiliated third party, for $7.0 million. At the time of sale, the Company’s investment basis in Invesco, L.P. was zero and the Company held no other ownership interest. As a result, the Company recorded the entire amount of the proceeds received as a gain on sale of unconsolidated real estate ventures in its consolidated statement of operations. 1000 Chesterbrook On June 30, 2016, the real estate venture known as 1000 Chesterbrook sold its office property, comprised of 172,286 square feet, located in Berwyn, Pennsylvania for a sales price of $32.1 million. As of June 30, 2016, the Company owned a 50% interest in the 1000 Chesterbrook real estate venture. The proceeds to 1000 Chesterbrook, net of closing costs, pro-ration adjustments and $23.2 million of debt assumed by the buyer, were $9.8 million. The Company recorded $3.2 million for its proportionate share of the Venture’s gain which is reflected in “Gain on Real Estate Venture transactions” on the accompanying consolidated statement of operations. The proceeds from the sale, along with $0.2 million of working capital, were distributed to the Company during the third quarter of 2016. evo at Cira Centre South Venture On January 25, 2013, the Company formed HSRE-Campus Crest IX Real Estate Venture ("evo at Cira"), a joint venture among the Company and two unaffiliated third parties: Campus Crest Properties, LLC ("Campus Crest") and HSRE-Campus Crest IXA, LLC ("HSRE"). From formation through March 2, 2016, each of the Company and Campus Crest owned a 30% interest in evo at Cira and HSRE owned a 40% interest. At formation, the Company contributed to evo at Cira its tenancy rights under a long-term ground lease of one acre of land located in the University City submarket of Philadelphia, Pennsylvania, together with associated development rights, at an agreed-upon value of $8.5 million. During the three-month period ended September 30, 2014, evo at Cira completed construction of a 33-story, 850-bed student housing tower on the contributed one-acre ground lease. As of December 31, 2014, the Company and other members of evo at Cira had funded 100% of their respective shares of committed equity contributions and the real estate venture had fully drawn on its $97.8 million construction facility. On March 2, 2016, the Company paid $12.8 million of cash and HSRE paid $6.6 million of cash to purchase Campus Crest’s entire 30% interest in evo at Cira and, as a result, each of the Company and HSRE owns a 50% interest in evo at Cira. Subsequent to the transaction, the Company’s investment basis in evo at Cira is $28.3 million. In conjunction with the purchase, the Company and HSRE entered into an amended and restated operating agreement to govern their rights and obligations as sole members of evo at Cira. On June 10, 2016, evo at Cira refinanced its $97.8 million construction facility maturing July 25, 2016 with a $117.0 million term loan bearing interest at LIBOR + 2.25% capped at a total maximum interest of 5.25% and maturing on October 31, 2019, with options to extend the term to June 30, 2021. evo at Cira received an advance of $105.0 million at closing. The additional $12.0 million capacity under the term loan may be funded if certain criteria relating to the operating performance of the student housing tower are met. The term loan is secured by a leasehold mortgage that holds absolute assignment of leases and rents. Subsequent to refinancing and the receipt of amounts in escrow under the construction loan, evo at Cira distributed $6.3 million to the Company. The Company accounted for its investment in evo at Cira under the equity method of accounting. Based upon the reconsideration event caused by the refinancing of evo at Cira’s construction facility, the Company reassessed its consolidation conclusion. The Company determined that this Real Estate Venture is no longer a VIE in accordance with the accounting standard for the consolidation of VIEs because evo at Cira, through the refinancing of the construction facility and without further support from the Company or HSRE, demonstrated that it has sufficient equity at risk to finance its activities. As a result, the Company used the voting interest model under the accounting standard for consolidation in order to determine whether to consolidate evo at Cira. Based upon each member's substantive participating rights over the activities that significantly impact the operations and revenues of evo at Cira under the operating agreement and related agreements, evo at Cira is not consolidated by the Company, and is accounted for under the equity method of accounting. As a result of this transaction, the Company did not gain a controlling financial interest over evo at Cira; therefore, it was not required to remeasure its previously held equity interest to fair value at the date that it acquired the additional equity interest. MAP Venture On February 4, 2016, Brandywine Operating Partnership, L.P., together with subsidiaries of the Operating Partnership, entered into a series of related transactions (the “Och-Ziff Sale”) with affiliates of Och-Ziff Capital Management Group LLC (“Och-Ziff”) that resulted in the disposition by the Company of 58 office properties that contain an aggregate of 3,924,783 square feet for an aggregate purchase price of $398.1 million. The 58 properties are located in the Pennsylvania Suburbs, New Jersey/Delaware, Metropolitan Washington, D.C. and Richmond, Virginia. The related transactions involved: (i) the sale by the Company to MAP Fee Owner LLC, an affiliate of Och-Ziff (the “O-Z Land Purchaser”), of 100% of the Company’s fee interests in the land parcels (the “Land Parcels”) underlying the 58 office properties, together with rights to be the lessor under long-term ground leases (the “Ground Leases”) covering the Land Parcels; (ii) the Company’s formation of MAP Ground Lease Venture LLC (the “MAP Venture”) with MAP Ground Lease Holdings LLC, an affiliate of Och-Ziff (the “O-Z Venture Partner”), (iii) the Company’s sale to MAP Venture of the office buildings and related improvements (the “Buildings”) situated on the Land Parcels; and (iv) the retention of a 50% non-controlling equity interest in the MAP Venture. The MAP Venture leases the Land Parcels from O-Z Land Purchaser through a ground lease that extends through February 2115. Annual payments by the MAP Venture, as tenant under the Ground Leases, initially total $11.9 million and increase 2.5% annually through November 2025. At closing on February 4, 2016, the MAP Venture obtained a third party non-recourse debt financing of approximately $180.8 million secured by mortgages on the Buildings of the MAP Venture. As a result of this transaction, the Company received $354.0 million in proceeds and maintains a 50% ownership interest in the MAP Venture valued as of February 4, 2016 at $25.2 million, which holds the leasehold interest in the Buildings. The MAP Venture was formed as a limited liability company in which the Company has been designated as the Managing Member. In addition, through an affiliate, the Company provides property management services at the Buildings on behalf of the MAP Venture for a market based management fee. The Company has determined that the MAP Venture is a VIE in accordance with the accounting standard for consolidation of VIE’s. As a result, the Company used the VIE model under the accounting standard for consolidations to determine if it will consolidate the MAP Venture. Based on the provisions in the limited liability company agreement, the Company determined that it shares with O-Z Venture Partner the power to control the activities that most significantly impact the economics of the MAP Venture. Since control is shared, the Buildings were deconsolidated by the Company and accounted for under the equity method of accounting. The Company is not required to fund the operating losses of the MAP Venture. Accordingly, it can only incur losses equal to its investment basis in MAP Venture. The Company has determined that this transaction does not represent a significant shift in the Company’s operations that have a major impact on the Company’s economic performance. As a result, the properties are not classified as discontinued operations on the consolidated financial statements. Coppell Associates On January 29, 2016, the Company sold its entire 50% interest in an unconsolidated real estate venture known as Coppell Associates. The proceeds to the Company, net of closing costs and related debt payoff, were $4.6 million. The carrying amount of the Company’s investment in Coppell Associates amounted to a $1.1 million liability at the sale date, resulting in a $5.7 million gain on sale of its interest in the real estate venture. The investment was in a liability position because the Company, as a general partner, was required to fund losses of Coppell Associates. The negative investment balance represented the Company’s share of unfunded cumulative losses incurred in excess of its investment basis as of the date of sale. Guarantees As of September 30, 2016, the Company had provided guarantees on behalf of certain real estate ventures, consisting of (i) a $3.2 million payment guarantee on the $56.0 million construction loan for TB-BDN Plymouth Apartments; (ii) a joint 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 $0.5 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, see Note 4, " Investment in Unconsolidated Real Estate Ventures,

Intangible Assets and Liabiliti

Intangible Assets and Liabilities	9 Months Ended
	Sep. 30, 2016
Goodwill And Intangible Assets Disclosure [Abstract]
INTANGIBLE ASSETS AND LIABILITIES	5. INTANGIBLE ASSETS AND LIABILITIES As of September 30, 2016 and December 31, 2015, the Company’s intangible assets/liabilities were comprised of the following (in thousands): September 30, 2016 Total Cost Accumulated Amortization Intangible Assets, net Intangible assets, net: In-place lease value $ 143,856 $ (68,400 ) $ 75,456 Tenant relationship value 14,135 (10,938 ) 3,197 Above market leases acquired 4,718 (2,164 ) 2,554 Total intangible assets, net $ 162,709 $ (81,502 ) $ 81,207 Acquired lease intangibles, net: Below market leases acquired $ 37,731 $ (18,000 ) $ 19,731 December 31, 2015 Total Cost Accumulated Amortization Intangible Assets, net Intangible assets, net: In-place lease value $ 161,276 $ (57,063 ) $ 104,213 Tenant relationship value 20,117 (15,580 ) 4,537 Above market leases acquired 5,333 (1,879 ) 3,454 186,726 (74,522 ) 112,204 Assets held for sale (2,854 ) 2,273 (581 ) Total intangible assets, net $ 183,872 $ (72,249 ) $ 111,623 Acquired lease intangibles, net: Below market leases acquired $ 50,025 $ (24,178 ) $ 25,847 Assets held for sale (1,069 ) 877 (192 ) Total acquired lease intangibles, net $ 48,956 $ (23,301 ) $ 25,655 As of September 30, 2016, the Company’s annual amortization for its intangible assets/liabilities were as follows (in thousands, and assuming no prospective early lease terminations): Assets Liabilities 2016 (three months remaining) $ 7,113 $ 1,613 2017 19,658 3,323 2018 11,753 2,196 2019 10,542 1,885 2020 8,456 1,337 Thereafter 23,685 9,377 Total $ 81,207 $ 19,731

Debt Obligations

Debt Obligations	9 Months Ended
	Sep. 30, 2016
Debt Disclosure [Abstract]
DEBT OBLIGATIONS	6. DEBT OBLIGATIONS The following table sets forth information regarding the Company’s consolidated debt obligations outstanding at September 30, 2016 and December 31, 2015 (in thousands): September 30, 2016 December 31, 2015 Effective Interest Rate Maturity Date MORTGAGE DEBT: 3141 Fairview Park Drive (a) $ - $ 20,838 4.25 % Jan 2017 Two Logan Square 86,395 86,886 3.98 % (b) May 2020 One Commerce Square 127,847 130,000 3.64 % Apr 2023 Two Commerce Square 112,000 112,000 4.51 % (c) Apr 2023 IRS Philadelphia Campus (d) - 177,425 7.00 % Sep 2030 Cira South Garage (d) - 35,546 7.12 % Sep 2030 Principal balance outstanding 326,242 562,695 Plus: fair market value premium (discount), net (2,870 ) (3,198 ) Less: deferred financing costs (749 ) (13,744 ) Mortgage indebtedness $ 322,623 $ 545,753 UNSECURED DEBT Seven-Year Term Loan - Swapped to fixed $ 250,000 $ 250,000 3.72 % Oct 2022 $250.0M 6.00% Guaranteed Notes due 2016 (e) - 149,919 5.95 % Apr 2016 $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 1,853,529 Plus: original issue premium (discount), net (4,932 ) (5,714 ) Less: deferred financing costs (7,740 ) (8,851 ) Total unsecured indebtedness $ 1,690,938 $ 1,838,964 Total Debt Obligations $ 2,013,561 $ 2,384,717 (a) On August 31, 2016, the Company deconsolidated 3141 Fairview Park Drive and began accounting for it under the equity method of accounting as part of Brandywine - AI Venture LLC, an unconsolidated real estate venture in which the Company holds a 50% interest. At December 31, 2015, this balance represented the full debt amount of the property, as it was consolidated at that time. See Note 4, “Investment in Unconsolidated Real Estate Ventures,” (b) On April 7, 2016, the Company closed on an $86.9 million first mortgage financing on Two Logan Square, a 708,844-square foot office property located in Philadelphia, Pennsylvania. Proceeds of the loan were used to repay, without penalty, the $86.6 million principal balance of the former Two Logan Square first mortgage loan, which had a 7.57% effective interest rate. (c) This loan was assumed upon acquisition of Two Commerce Square 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, and a default under the One Commerce Square loan will also constitute a default under this loan. This loan is also secured by a lien on One Commerce Square and the lien on Two Commerce Square. (d) On January 14, 2016, the Company funded $265.8 million to prepay two mortgage loans, consisting of $176.9 million of principal repayment, $44.5 million in prepayment charges and a nominal amount of accrued interest, in repayment of the mortgage indebtedness on the office property located at 2970 Market Street in Philadelphia, Pennsylvania commonly known as 30 th (e) On April 1, 2016, the entire principal balance of the 2016 6.00% Guaranteed Unsecured Notes was repaid upon maturity. Available cash balances were used to fund the repayment of the unsecured notes. As of September 30, 2016, and December 31, 2015, 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 the three-month period ended September 30, 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 September 30, 2016. 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 Instrum

Fair Value of Financial Instruments	9 Months Ended
	Sep. 30, 2016
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 September 30, 2016 and December 31, 2015, 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 September 30, 2016 and December 31, 2015 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): September 30, 2016 December 31, 2015 Carrying Amount Fair Value Carrying Amount Fair Value Unsecured notes payable $ 1,364,312 $ 1,415,520 $ 1,512,554 $ 1,529,346 Variable rate debt $ 326,626 $ 305,301 $ 326,410 $ 305,522 Mortgage notes payable $ 322,623 $ 339,471 $ 545,753 $ 597,377 Note receivable (a) $ 3,365 $ 3,365 $ - $ - (a) A note receivable is included in other assets on the Company’s consolidated balance sheet. The note was given to an unaffiliated third party to facilitate their acquisition and development of an industrial facility located in Pennsauken, New Jersey. The loan matures three years after the payment commencement date, which is 90 days after substantial completion of the development, and bears interest at 6.3% during year one, 7.0% during year two and 8.0% during year three. The Company evaluated its investment in the note receivable under ASC 310, Receivables categorized as Level 3. 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 September 30, 2016 and December 31, 2015. 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 as to calculate fair value as of September 30, 2016 and December 31, 2015 was 4.494% and 4.550%, 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 September 30, 2016 and December 31, 2015. 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 September 30, 2016, and current estimates of fair value may differ from the amounts presented herein.

Limited Partners' Non-Controlli

Limited Partners' Non-Controlling Interests in the Parent Company	9 Months Ended
	Sep. 30, 2016
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 as of September 30, 2016 and December 31, 2015 was $15.2 million and $16.1 million, 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 September 30, 2016 and December 31, 2015, respectively, was approximately $23.1 million and $21.0 million.

Fair Value of Derivative Financ

Fair Value of Derivative Financial Instruments	9 Months Ended
	Sep. 30, 2016
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 September 30, 2016 and December 31, 2015. 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 liabilities on the Company’s consolidated balance sheets). Hedge Product Hedge Type Designation Notional Amount Strike Trade Date Maturity Date Fair value 9/30/2016 12/31/2015 9/30/2016 12/31/2015 (Liabilities) / Assets Swap Interest Rate Cash Flow (a) $ 250,000 $ 250,000 3.718 % October 8, 2015 October 8, 2022 $ (8,122 ) $ 1,884 Swap Interest Rate Cash Flow (a) 25,774 25,774 3.300 % December 22, 2011 January 30, 2021 (1,058 ) (531 ) Swap Interest Rate Cash Flow (a) 25,774 25,774 3.090 % January 6, 2012 October 30, 2019 (663 ) (388 ) Swap Interest Rate Cash Flow (a) 27,062 27,062 2.750 % December 21, 2011 September 30, 2017 (156 ) (201 ) $ 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. 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.

Beneficiaries Equity of the Par

Beneficiaries Equity of the Parent Company	9 Months Ended
	Sep. 30, 2016
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 September 30, 2016 2015 Basic Diluted Basic Diluted Numerator Income from continuing operations $ 7,884 $ 7,884 $ 20,308 $ 20,308 Net income from continuing operations attributable to non-controlling interests (58 ) (58 ) (161 ) (161 ) Nonforfeitable dividends allocated to unvested restricted shareholders (79 ) (79 ) (76 ) (76 ) Preferred share dividends (1,725 ) (1,725 ) (1,725 ) (1,725 ) Net income attributable to common shareholders $ 6,022 $ 6,022 $ 18,346 $ 18,346 Denominator Weighted-average shares outstanding 175,127,110 175,127,110 178,188,037 178,188,037 Contingent securities/Share based compensation - 1,237,505 - 588,647 Weighted-average shares outstanding 175,127,110 176,364,615 178,188,037 178,776,684 Earnings per Common Share: Net income attributable to common shareholders $ 0.03 $ 0.03 $ 0.10 $ 0.10 Nine-month periods ended September 30, 2016 2015 Basic Diluted Basic Diluted Numerator Income from continuing operations $ 52,871 $ 52,871 $ 31,960 $ 31,960 Net income from continuing operations attributable to non-controlling interests (425 ) (425 ) (221 ) (221 ) Nonforfeitable dividends allocated to unvested restricted shareholders (263 ) (263 ) (253 ) (253 ) Preferred share dividends (5,175 ) (5,175 ) (5,175 ) (5,175 ) Net income attributable to common shareholders $ 47,008 $ 47,008 $ 26,311 $ 26,311 Denominator Weighted-average shares outstanding 174,976,998 174,976,998 179,198,714 179,198,714 Contingent securities/Share based compensation - 1,032,824 - 789,778 Weighted-average shares outstanding 174,976,998 176,009,822 179,198,714 179,988,492 Earnings per Common Share: Net income attributable to common shareholders $ 0.27 $ 0.27 $ 0.15 $ 0.15 Redeemable common limited partnership units totaling 1,479,799 at September 30, 2016 and 1,535,102 at September 30, 2015, 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- and nine-month periods ended September 30, 2016 and 2015, 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 September 13, 2016, the Parent Company declared a distribution of $0.16 per common share, totaling $28.3 million, which was paid on October 19, 2016 to shareholders of record as of October 5, 2016. In addition, the Parent Company declared distributions on its Series E Preferred Shares to holders of record as of September 30, 2016. These shares are entitled to a preferential return of 6.90% per annum on the $25.00 per share liquidation preference. Distributions paid on October 17, 2016 to holders of Series E Preferred Shares totaled $1.7 million. On November 5, 2013, the Parent Company commenced a continuous equity offering program (the “Offering Program”), under which it may sell, in at-the-market offerings, up to an aggregate amount of 16,000,000 common shares until November 5, 2016. From inception of the Offering Program through September 30, 2016, the Parent Company did not sell any shares under the program. Common Share Repurchases The Parent Company maintains a share repurchase program under which the Board of Trustees has authorized the Parent Company to repurchase shares of its preferred and common stock with no expiration date. On July 22, 2015, the Parent Company's Board of Trustees authorized additional share repurchases of up to $100.0 million. Prior to the authorization 539,200 common shares were available for repurchase under the preexisting share repurchase program. The Company expects to fund the share repurchases with a combination of available cash balances and availability under our line of credit. As of September 30, 2016, 5,209,437 common shares have been repurchased and retired at an average purchase price of $12.90 per share and totaling $67.3 million. The timing and amounts of any purchases will depend on a variety of factors, including market conditions, regulatory requirements, share prices, capital availability and other factors as determined by our management team. The repurchase program does not require the purchase of any minimum number of shares and may be suspended or discontinued at any time without notice. There were no shares repurchased under the program during the nine months ended September 30, 2016. There were 4,701,302 common shares repurchased and retired at an average purchase price of $12.92 per share totaling $60.8 million during the nine months ended September 30, 2015. Maryland law applicable to the Company does not contemplate treasury stock, and common shares repurchased under the program are accounted for as a reduction of common shares (at $0.01 par value per share) and a decrease to additional paid-in-capital.

Partners Equity of The Operatin

Partners Equity of The Operating Partnership	9 Months Ended
	Sep. 30, 2016
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 September 30, 2016 2015 Basic Diluted Basic Diluted Numerator Income from continuing operations $ 7,884 $ 7,884 $ 20,308 $ 20,308 Nonforfeitable dividends allocated to unvested restricted unitholders (79 ) (79 ) (76 ) (76 ) Preferred unit dividends (1,725 ) (1,725 ) (1,725 ) (1,725 ) Net income attributable to non-controlling interests (6 ) (6 ) (1 ) (1 ) Net income attributable to common unitholders $ 6,074 $ 6,074 $ 18,506 $ 18,506 Denominator Weighted-average units outstanding 176,606,909 176,606,909 179,723,139 179,723,139 Contingent securities/Share based compensation - 1,237,505 - 588,647 Total weighted-average units outstanding 176,606,909 177,844,414 179,723,139 180,311,786 Earnings per Common Partnership Unit: Net income attributable to common unitholders $ 0.03 $ 0.03 $ 0.10 $ 0.10 Nine-month periods ended September 30, 2016 2015 Basic Diluted Basic Diluted Numerator Income from continuing operations $ 52,871 $ 52,871 $ 31,960 $ 31,960 Nonforfeitable dividends allocated to unvested restricted unitholders (263 ) (263 ) (253 ) (253 ) Preferred unit dividends (5,175 ) (5,175 ) (5,175 ) (5,175 ) Net (income) loss attributable to non-controlling interests (12 ) (12 ) 4 4 Net income attributable to common unitholders $ 47,421 $ 47,421 $ 26,536 $ 26,536 Denominator Weighted-average units outstanding 176,491,311 176,491,311 180,733,816 180,733,816 Contingent securities/Share based compensation - 1,032,824 - 789,778 Total weighted-average units outstanding 176,491,311 177,524,135 180,733,816 181,523,594 Earnings per Common Partnership Unit: Net income attributable to common unitholders $ 0.27 $ 0.27 $ 0.15 $ 0.15 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 and nine- month periods ended September 30, 2016 and 2015, 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 September 13, 2016, the Operating Partnership declared a distribution of $0.16 per common partnership unit, totaling $28.3 million, which was paid on October 19, 2016 to unitholders of record as of October 5, 2016. In addition, the Operating Partnership declared distributions on its Series E-Linked Preferred Mirror Units to holders of record as of September 30, 2016. These units are entitled to a preferential return of 6.90% per annum on the $25.00 per unit liquidation preference. Distributions paid on October 17, 2016 to holders of Series E-Linked Preferred Mirror Units totaled $1.7 million.

Segment Information

Segment Information	9 Months Ended
	Sep. 30, 2016
Segment Reporting [Abstract]
SEGMENT INFORMATION	12. SEGMENT INFORMATION During the year ended December 31, 2015, the Company managed its portfolio within seven segments: (1) Pennsylvania Suburbs, (2) Philadelphia Central Business District (CBD), (3) Metropolitan Washington, D.C., (4) New Jersey/Delaware, (5) Richmond, Virginia, (6) Austin, Texas and (7) California. As a result of the Och-Ziff Sale that occurred on February 4, 2016, the Company narrowed its segments to five segments: (1) Pennsylvania Suburbs, (2) Philadelphia Central Business District (“CBD”), (3) Metropolitan Washington, D.C. and (4) Austin, Texas and (5) Other. The Och-Ziff Sale disposed of the entire Richmond, Virginia segment. Subsequent to the Och-Ziff Sale, the segments previously defined as New Jersey/Delaware and California are now being managed as a consolidated segment entitled “Other,” as these geographies no longer provide a significant revenue contribution. The Pennsylvania Suburbs segment includes properties in Chester, Delaware, and Montgomery counties in the Philadelphia suburbs. The Philadelphia CBD segment includes properties located in the City of Philadelphia in Pennsylvania. 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 in Burlington and Camden counties in New Jersey, properties in New Castle County in the state of Delaware, and properties in the City of Oakland and City of Concord in California. 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: September 30, 2016 December 31, 2015 Philadelphia CBD (a) $ 1,321,079 $ 1,157,667 Pennsylvania Suburbs 1,011,490 1,019,280 Metropolitan Washington, D.C. (b) 999,549 1,129,206 Austin, Texas (c) 146,794 164,518 Other (d), (e) 207,427 222,329 $ 3,686,339 $ 3,693,000 Assets held for sale (f), (g) 16,916 794,588 Operating Properties $ 3,703,255 $ 4,487,588 Corporate Construction-in-progress $ 249,183 $ 268,983 Land held for development $ 155,297 $ 130,479 (a) The increase primarily relates to the office component of the FMC Tower at Cira Centre South being placed into service during the second quarter of 2016. See Note 3, "Real Estate Investments," (b) The decrease primarily relates to the sale of Herndon Metro Plaza I & II. See Note 3, "Real Estate Investments," (c) The decrease primarily relates to a building from the Broadmoor Austin portfolio being placed into redevelopment during the three-month period ended June 30, 2016. (d) The decrease primarily relates to the sale of the office property at 1120 Executive Boulevard in Mount Laurel, New Jersey and the held for sale classification of Oakland Lot B in Oakland, California. See Note 3, "Real Estate Investments," (e) As a result of the Och-Ziff Sale that occurred on February 4, 2016, the Company narrowed its segments to five segments: (1) Pennsylvania Suburbs, (2) Philadelphia Central Business District (“CBD”), (3) Metropolitan Washington, D.C. and (4) Austin, Texas and (5) Other. The Och-Ziff Sale disposed of the entire Richmond, Virginia segment. Subsequent to the Och-Ziff Sale, the segments previously defined as New Jersey/Delaware and California are now being managed as a consolidated segment entitled “Other,” as these geographies no longer provide a significant revenue contribution. Accordingly, the chief operating decision maker revised the management structure, reallocated resources, and is assessing business operations of the five segments as of January 1, 2016. ( f ) As of December 31, 2015, the office property located at 2970 Market Street in Philadelphia, Pennsylvania commonly known as 30 th "Real Estate Investments," ( g ) As of December 31, 2015, the 58 properties associated with the series of related transactions with Och-Ziff Real Estate were classified as held for sale on the consolidated balance sheets. On February 4, 2016, the Company completed a series of transactions, resulting in the disposition of the properties. See Note 3, “Real Estate Investments,” Real Estate Investments 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 September 30, 2016 2015 Total revenue Operating expenses (a) Net operating income (loss) Total revenue Operating expenses (a) Net operating income Philadelphia CBD $ 50,744 $ (19,071 ) $ 31,673 $ 52,203 $ (18,750 ) $ 33,453 Pennsylvania Suburbs 35,763 (11,247 ) 24,516 39,507 (14,004 ) 25,503 Metropolitan Washington, D.C. 24,251 (9,900 ) 14,351 27,587 (10,792 ) 16,795 Austin, Texas (b) 8,726 (3,523 ) 5,203 8,533 (2,625 ) 5,908 Other (c) 8,526 (4,837 ) 3,689 24,275 (12,061 ) 12,214 Corporate (d) 1,684 (2,739 ) (1,055 ) 480 (386 ) 94 Operating Properties $ 129,694 $ (51,317 ) $ 78,377 $ 152,585 $ (58,618 ) $ 93,967 Nine-month periods ended September 30, 2016 2015 Total revenue Operating expenses (a) Net operating income Total revenue Operating expenses (a) Net operating income Philadelphia CBD $ 148,496 $ (58,102 ) $ 90,394 $ 157,595 $ (56,587 ) $ 101,008 Pennsylvania Suburbs 107,971 (36,982 ) 70,989 118,407 (41,286 ) 77,121 Metropolitan Washington, D.C. 76,881 (29,567 ) 47,314 81,947 (33,197 ) 48,750 Austin, Texas (b) 25,123 (9,689 ) 15,434 11,999 (4,993 ) 7,006 Other (c) 30,328 (17,513 ) 12,815 76,129 (38,238 ) 37,891 Corporate (d) 4,578 (4,460 ) 118 2,562 (1,364 ) 1,198 Operating Properties $ 393,377 $ (156,313 ) $ 237,064 $ 448,639 $ (175,665 ) $ 272,974 (a) Includes property operating expense, real estate taxes and third party management expense. (b) On June 22, 2015 the Company acquired the remaining 50.0% interest in Broadmoor Austin Associates. As such, the Company has seven wholly owned properties in its Austin, Texas business segment at June 30, 2016. In addition, net operating income for the three and nine months ended September 30, 2016 and 2015 includes management fees and related expenses for services provided by the Company to the Austin Venture (c) See footnote (e) to the “Real estate investments, at cost” table above for further information regarding this segment. (d) Increase in revenue and operating expenses primarily relates to the third party management operations of the Subaru Headquarters Development and third party management of the MAP Venture. Unconsolidated real estate ventures (in thousands): Investment in real estate ventures, at equity Equity in income (loss) of real estate ventures As of Three-month periods ended September 30, Nine-month periods ended September 30, September 30, 2016 December 31, 2015 2016 2015 2016 2015 Philadelphia CBD (a) $ 48,904 $ 44,089 $ (453 ) $ (186 ) $ (473 ) $ (636 ) Pennsylvania Suburbs 15,025 16,408 (170 ) (120 ) 410 (142 ) Metropolitan Washington, D.C. (b) 140,219 118,422 (5,287 ) (343 ) (6,068 ) (572 ) MAP Venture (c) 22,503 - (1,010 ) - (2,608 ) - Other (d) 1,554 1,657 227 173 715 669 Austin, Texas (e) 53,957 60,428 (561 ) (617 ) (1,299 ) (1,154 ) Total $ 282,162 $ 241,004 $ (7,254 ) $ (1,093 ) $ (9,323 ) $ (1,835 ) (a) Net increase of investment of $4.8 million primary relates to the evo at Cira real estate venture. See Note 4, “ Investment in Unconsolidated Real Estate Ventures, (b) On August 31, 2016, the Company terminated its lease for the regional management and leasing office at 3141 Fairview Park Drive, located in Falls Church, Virginia. Accordingly, the Company no longer has any continuing involvement with 3141 Fairview Park Drive and recorded the partial sale under the full accrual method of accounting. As a result, the Company deconsolidated net assets of $45.6 million, a mortgage loan of $20.6 million and a financing liability of $12.4 million related to the property from its consolidated balance sheet and recorded a $12.6 million equity method investment to the Company’s Brandywine - AI Venture LLC, in which the Company owns a 50% interest. See Note 4, “Investment in Unconsolidated Real Estate Ventures,” (c) 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. See Note 4 “ Investment in Unconsolidated Real Estate Ventures, (d) See footnote (e) to the “Real estate investments, at cost” table above for further information regarding this segment. (e) Investment in real estate ventures does not include the $1.1 million negative investment balance in one real estate venture as of December 31, 2015, which is included in other liabilities. The Company disposed of its interest in this venture during the three-month period ended March 31, 2016. See Note 4, " Investment in Unconsolidated Real Estate Ventures 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. Segment NOI includes revenue, real estate taxes and property operating expenses directly related to operation and management of the properties owned and managed within the respective geographical region. Segment NOI excludes property level depreciation and amortization, revenue and expenses directly associated with third party real estate management services, expenses associated with corporate administrative support services, and inter-company eliminations. NOI also does not reflect general and administrative expenses, interest expenses, real estate impairment losses, depreciation and amortization costs, capital expenditures and leasing costs. Trends in development and construction activities that could materially impact the Company’s results from operations are also not reflected in NOI. 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 also believes that NOI provides useful information to investors regarding its financial condition and results of operations because it reflects only those income and expenses recorded at the property level. 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 September 30, Nine-month periods ended September 30, 2016 2015 2016 2015 Consolidated net operating income $ 78,377 $ 93,967 $ 237,064 $ 272,974 Less: Interest expense (20,814 ) (27,900 ) (64,334 ) (83,971 ) Interest expense - amortization of deferred financing costs (645 ) (1,010 ) (2,063 ) (3,377 ) Interest expense - financing obligation (156 ) (296 ) (679 ) (906 ) Depreciation and amortization (46,956 ) (58,314 ) (142,736 ) (160,355 ) General and administrative expenses (5,515 ) (6,127 ) (20,711 ) (21,554 ) Equity in loss of real estate ventures (7,254 ) (1,093 ) (9,323 ) (1,835 ) Provision for impairment - - (13,069 ) (2,508 ) Loss on early extinguishment of debt - - (66,590 ) - Plus: Interest income 291 126 970 1,189 Tax credit transaction income - 11,853 - 11,853 Net gain (loss) on disposition of real estate (104 ) 6,083 114,625 16,673 Net gain on sale of undepreciated real estate 188 3,019 188 3,019 Net gain from remeasurement of investment in a real estate venture - - - 758 Net gain on Real Estate Venture transactions 10,472 - 19,529 - Net income $ 7,884 $ 20,308 $ 52,871 $ 31,960

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2016
Commitments And Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	13. 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 has funded required leasing and capital reserve accounts for the benefit of the mortgage lenders with letters-of-credit. There is an associated $10.0 million letter of credit for a mortgage lender at September 30, 2016. 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 5 to 73 years. Minimum future rental payments on non-cancelable leases at September 30, 2016 are as follows (in thousands): Year Minimum Rent 2016 (three months remaining) $ 444 2017 1,333 2018 1,333 2019 1,333 2020 1,333 Thereafter 67,411 Total $ 73,187 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, 2015 for further detail regarding commitments and contingencies. Put Option 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 September 30, 2016, the liability had accreted to $1.7 million. As there were no significant changes to the inputs, the liability remains within Level 3 for fair value reporting. Debt Guarantees As of September 30, 2016, the Company had provided guarantees on behalf of certain real estate ventures, consisting of (i) a $3.2 million payment guarantee on the $56.0 million construction loan for TB-BDN Plymouth Apartments; (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 (iii) a $0.5 million payment guarantee on a loan provided to PJP VII. See Note 4, " Investment in Unconsolidated Real Estate Ventures," 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. The Company is currently under agreement to sell 9.5 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 $5.8 million. Total estimated costs related to the improvements are included in the sale price of each land parcel. Recognition of the profit earned upon 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 $77.3 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. The Company invests in its properties and regularly incurs capital expenditures in the ordinary course 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. See Note 3, “ Real Estate Investments Capital Expenditures Amounts remaining to be incurred as of September 30, 2016 included the following: • development and redevelopment obligations of $144.3 million; and • capital expenditures of $36.4 million for tenant improvements and $5.9 million for capital improvements that we expect to be funded within one year.

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2016
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	14. SUBSEQUENT EVENTS On October 13, 2016, the Company completed the disposition of three office properties located at 620, 640 and 660 Allendale Road in King of Prussia, Pennsylvania containing 156,669 net rentable square feet, for a gross sales price of $12.8 million resulting in an estimated gain on sale of $2.4 million after closing and other related transaction costs.

Basis of Presentation (Policies

Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2016
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 September 30, 2016, the results of its operations for the three and nine-month periods ended September 30, 2016 and 2015 and its cash flows for the nine-month periods ended September 30, 2016 and 2015 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 2015 Annual Report on Form 10-K filed with the SEC on February 29, 2016. On January 1, 2016, the Company adopted accounting guidance under Accounting Standards Codification (ASC) Topic 810, "Consolidation,” modifying the analysis it must perform to determine whether it should consolidate certain types of legal entities. The guidance does not amend the existing disclosure requirements for variable interest entities (“VIEs”) or voting interest model entities. The guidance, however, modified the requirements to qualify under the voting interest model. Under the revised guidance, the Operating Partnership is a variable interest entity of the Parent Company. As the Operating Partnership is already consolidated in the balance sheets of the Parent Company, the identification of this entity as a variable interest entity has no impact on the consolidated financial statements of the Parent Company. There were no other legal entities qualifying under the scope of the revised guidance that were consolidated as a result of the adoption of this guidance. In addition, there were no other voting interest entities under prior existing guidance determined to be variable interest entities under the revised guidance. The Company's Annual Report on Form 10-K for the year ended December 31, 2015 contains a discussion of our significant accounting policies under Note 2, "Summary of Significant Accounting Policies".
Recent Accounting Pronouncements	Recent Accounting Pronouncements In August 2016, the Financial Accounting Standards Board (FASB) issued guidance intended to reduce diversity in practice in how certain transactions are classified in the statement of cash flows. The areas addressed in the new guidance related to debt prepayment costs, settlement of zero-coupon debt instruments, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, proceeds from the settlement of corporate-owned and bank-owned life insurance policies, distributions received from equity method investments, beneficial interest in securitization transactions, and separately identifiable cash flows and application of the predominance principle. The standard is effective for financial statements issued for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted, provided that all of the amendments are adopted in the same period. The guidance requires application using a retrospective transition method. The Company is in the process of determining the impact, if any, that the adoption will have on its consolidated financial statements. In June 2016, the FASB issued guidance that changes how entities measure credit losses for most financial assets and certain other instruments that are not measured at fair value through net income. The guidance replaces the current incurred loss model with an expected loss approach, resulting in a more timely recognition of such losses. The guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted after December 2018. The Company is in the process of evaluating the impact of this new guidance and has not yet determined the impact, if any, that the adoption of this guidance will have on its consolidated financial statements. In May 2016, the FASB issued guidance amending the revenue from contracts with customers standard issued in May 2014 (and not yet effective). The amendments are intended to address implementation issues that were raised by stakeholders and discussed by the Joint Transition Resource Group, and provide additional practical expedients on collectability, noncash consideration, presentation of sales tax and contract modifications and completed contracts at transition. In accordance with the FASB election to defer the effective date of the revenue recognition standard by one year, reporting entities may choose to adopt the standard as of its original effective date or for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2017. Calendar year-end reporting entities are therefore required to apply the new revenue guidance beginning in their 2018 interim and annual financial statements. In March 2016, the FASB issued guidance intended to simplify various aspects related to how share-based payments are accounted for and presented in the financial statements. The new guidance allows for entities to make an entity-wide accounting policy election to either estimate the number of awards that are expected to vest or account for forfeitures when they occur. In addition, the guidance allows employers to withhold shares to satisfy minimum statutory tax withholding requirements up to the employees’ maximum individual tax rate without causing the award to be classified as a liability. The guidance also stipulates that cash paid by an employer to a taxing authority when directly withholding shares for tax-withholding purposes should be classified as a financing activity on the statement of cash flows. This guidance is effective for annual reporting periods beginning after December 15, 2016, and interim periods within that reporting period. Early adoption is permitted in any interim or annual period, with any adjustments reflected as of the beginning of the fiscal year of adoption. The Company is in the process of evaluating the impact of this new guidance and has not yet determined the impact, if any, that the adoption of this guidance will have on its consolidated financial statements. Also in March 2016, the FASB issued guidance clarifying that a novation of party to a derivative instrument, whereby one of the parties to a derivative instrument is replaced with another party, does not, in and of itself, require de-designation of that hedging relationship provided that all other hedge criteria continue to be met. The guidance is effective for financial statements issued for fiscal years beginning after December 15, 2016, and interim periods within those fiscal years. An entity has an option to apply the amendments either on a prospective basis or on a modified retrospective basis. The Company is in the process of evaluating the impact of this new guidance and has not yet determined the impact, if any, that the adoption of this guidance will have on its consolidated financial statements. In February 2016, the FASB issued guidance modifying the principles for the recognition, measurement, presentation and disclosure of leases for both parties to a contract (i.e. lessees and lessors). The new standard requires lessees to apply a dual approach, classifying leases as either finance or operating leases based on the principle of whether or not the lease is effectively a financed purchase by the lessee. This classification will determine whether lease expense is recognized based on an effective interest method or on a straight line basis over the term of the lease, respectively. A lessee is also required to record a right-of-use asset and a lease liability for all leases with a term of greater than 12 months regardless of their classification. Leases with a term of 12 months or less will be accounted for in the same manner as operating leases today. The new standard requires lessors to account for leases using an approach that is substantially equivalent to existing guidance for sales-type leases, direct financing leases and operating leases. The guidance supersedes previously issued guidance under ASC Topic 840 “Leases.” The guidance is effective on January 1, 2019, with early adoption permitted. The Company is in the process of evaluating the impact of this new guidance and has not yet determined the impact, if any, that the adoption of this guidance will have on its consolidated financial statements. In August 2014, the FASB issued guidance regarding an Entity’s Ability to Continue as a Going Concern, which requires management to assess a company’s ability to continue as a going concern and to provide related footnote disclosures in certain circumstances. Before this new standard, there was minimal guidance in U.S. GAAP specific to going concern. Under the new standard, disclosures are required when conditions give rise to substantial doubt about a company’s ability to continue as a going concern within one year from the financial statement issuance date. The guidance is effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period, with early adoption permitted. The Company has not yet determined the impact, if any, that the adoption of this guidance will have on its consolidated financial statements. In May 2014, the FASB issued the revenue from contracts with customers standard requiring revenue to be recognized in an amount that reflects the consideration expected to be received in exchange for goods and services. The standard requires the disclosure of sufficient quantitative and qualitative information for financial statement users to understand the nature, amount, timing and uncertainty of revenue and associated cash flows arising from contracts with customers. On July 9, 2015, the FASB elected to defer the effective date of this revenue recognition standard by one year. Reporting entities may choose to adopt the standard as of the original effective date or for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2017. Calendar year-end reporting entities are therefore required to apply the new revenue guidance beginning in their 2018 interim and annual financial statements. The Company is in the process of evaluating the impact of this new standard and has not yet determined the impact, if any, that the adoption of this standard will have on its consolidated financial statements.

Real Estate Investments (Tables

Real Estate Investments (Tables)	9 Months Ended
	Sep. 30, 2016
Real Estate Properties [Line Items]
Gross Carrying Value Of Properties	As of September 30, 2016 and December 31, 2015, the gross carrying value of the Properties were as follows (in thousands): September 30, December 31, 2016 2015 Land $ 488,580 $ 513,268 Building and improvements 2,561,976 2,719,780 Tenant improvements 635,783 459,952 Operating properties 3,686,339 3,693,000 Assets held for sale - real estate investments 16,916 794,588 Total $ 3,703,255 $ 4,487,588
Dispositions	The Company sold the following office properties during the nine-month period ended September 30, 2016 (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) September 1, 2016 1120 Executive Plaza Mt. Laurel, NJ 1 95,183 $ 9,500 $ 9,241 $ (18 ) (b) August 2, 2016 50 East Clementon Road Gibbsboro, NJ 1 3,080 1,100 1,011 (85 ) May 11, 2016 196/198 Van Buren Street (Herndon Metro Plaza I&II) Herndon, VA 2 197,225 44,500 43,412 (752 ) (c) February 5, 2016 2970 Market Street (Cira Square) Philadelphia, PA 1 862,692 354,000 350,150 115,828 February 4, 2016 Och-Ziff Portfolio Various (d) 58 3,924,783 398,100 353,971 (372 ) (e) Total Dispositions 63 5,082,963 $ 807,200 $ 757,785 $ 114,601 (a) Gain/(Loss) on Sale is net of closing and other transaction related costs. (b) As of June 30, 2016, the Company determined that the sale of the property was probable and classified this property as held for sale in accordance with applicable accounting standards for long lived assets. At such date, the carrying value of the property exceeded the fair value less the anticipated costs of sale. As a result, the Company recognized a provision for impairment totaling approximately $1.8 million during the three-month period ended June 30, 2016. The fair value measurement was based on the pricing in the purchase and sale agreement. As the pricing in the purchase and sale agreement is unobservable, the Company determined that the inputs utilized to determine fair value for this property falls within Level 3 in accordance with the fair value hierarchy established by "Fair Value Measurements and Disclosures.” The loss on sale represents additional closing costs recognized at settlement (c ) During the three-month period ended March 31, 2016, the Company recognized a provision for impairment totaling approximately $7.4 million on the properties. See “Held for Use Impairment” section below. The loss on sale primarily relates to additional closing costs recognized at settlement . ( d ) Exhibit 99.2 to the Company’s Current Report on Form 8-K filed on February 10, 2016 contains a complete list of the 58 properties disposed of in the transactions with Och-Ziff Capital Management Group LLC. See Note 4, " Investment in Unconsolidated Real Estate Ventures ," for further details of the transactions. ( e ) During the three-month period ended December 31, 2015, the Company recognized a provision for impairment totaling approximately $45.4 million. The loss on sale represents additional closing costs recognized at settlement.
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 properties classified as held for sale but which did not meet the criteria to be classified within discontinued operations at September 30, 2016 (in thousands): Held for Sale Properties Included in Continuing Operations September 30, 2016 620, 640 and 660 Allendale Road Oakland Lot B Total ASSETS HELD FOR SALE Real estate investments: Operating properties $ 12,550 $ 4,366 $ 16,916 Accumulated depreciation (4,520 ) (4 ) (4,524 ) Operating real estate investments, net 8,030 4,362 12,392 Construction-in-progress 212 - 212 Total real estate investments, net 8,242 4,362 12,604 Other assets - - - Total assets held for sale, net $ 8,242 $ 4,362 $ 12,604 LIABILITIES HELD FOR SALE Other liabilities $ 49 $ - $ 49 Total liabilities held for sale $ 49 $ - $ 49

Investment in Unconsolidated 28

Investment in Unconsolidated Real Estate Ventures (Tables)	9 Months Ended
	Sep. 30, 2016
Equity Method Investments And Joint Ventures [Abstract]
Summary of Financial Position of Real Estate Ventures	The following is a summary of the financial position of the Real Estate Ventures as of September 30, 2016 and December 31, 2015 (in thousands): September 30, 2016 December 31, 2015 Net property $ 1,463,500 $ 1,258,999 Other assets 270,892 158,672 Other liabilities 124,949 69,028 Debt, net 1,007,062 794,571 Equity 602,381 554,072 Company’s share of equity (Company’s basis) (a) (b) $ 282,162 $ 241,004 (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. (b ) Does not include the negative investment balance in one real estate venture totaling $1.1 million as of December 31, 2015, which is included in other liabilities. There is no negative investment balance as of September 30, 2016 because the Company sold its entire remaining 50% interest in the applicable real estate venture (See “ Coppell Associates ” section below) during the three month period ended March 31, 2016.
Summary of Results of Operations of Real Estate Ventures with Interests	The following is a summary of results of operations of the Real Estate Ventures in which the Company had interests during the three- and nine-months periods ended September 30, 2016 and 2015 (in thousands): Three-month periods ended September 30, Nine-month periods ended September 30, 2016 2015 2016 2015 Revenue $ 57,710 $ 37,076 $ 157,641 $ 126,424 Operating expenses (27,592 ) (16,917 ) (81,347 ) (54,581 ) Provision for impairment (a) (10,476 ) - (10,476 ) - Interest expense, net (12,102 ) (7,936 ) (32,019 ) (27,918 ) Depreciation and amortization (22,722 ) (15,681 ) (63,125 ) (52,218 ) Net loss (b) $ (15,182 ) $ (3,458 ) $ (29,326 ) $ (8,293 ) Equity in loss of Real Estate Ventures $ (7,254 ) $ (1,093 ) $ (9,323 ) $ (1,835 ) (a) During the period ended September 30, 2016, Brandywine-AI Venture LLC recorded a property level impairment charge of $10.4 million. See additional details in the “Station Square Impairment” disclosure below. (b) The nine-month period ended September 30, 2016 amount includes $7.1 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 Liabili29

Intangible Assets and Liabilities (Tables)	9 Months Ended
	Sep. 30, 2016
Goodwill And Intangible Assets Disclosure [Abstract]
Summary of Intangible Assets and Liabilities	As of September 30, 2016 and December 31, 2015, the Company’s intangible assets/liabilities were comprised of the following (in thousands): September 30, 2016 Total Cost Accumulated Amortization Intangible Assets, net Intangible assets, net: In-place lease value $ 143,856 $ (68,400 ) $ 75,456 Tenant relationship value 14,135 (10,938 ) 3,197 Above market leases acquired 4,718 (2,164 ) 2,554 Total intangible assets, net $ 162,709 $ (81,502 ) $ 81,207 Acquired lease intangibles, net: Below market leases acquired $ 37,731 $ (18,000 ) $ 19,731 December 31, 2015 Total Cost Accumulated Amortization Intangible Assets, net Intangible assets, net: In-place lease value $ 161,276 $ (57,063 ) $ 104,213 Tenant relationship value 20,117 (15,580 ) 4,537 Above market leases acquired 5,333 (1,879 ) 3,454 186,726 (74,522 ) 112,204 Assets held for sale (2,854 ) 2,273 (581 ) Total intangible assets, net $ 183,872 $ (72,249 ) $ 111,623 Acquired lease intangibles, net: Below market leases acquired $ 50,025 $ (24,178 ) $ 25,847 Assets held for sale (1,069 ) 877 (192 ) Total acquired lease intangibles, net $ 48,956 $ (23,301 ) $ 25,655
Summary of Amortization for Intangible Assets and Liabilities	As of September 30, 2016, the Company’s annual amortization for its intangible assets/liabilities were as follows (in thousands, and assuming no prospective early lease terminations): Assets Liabilities 2016 (three months remaining) $ 7,113 $ 1,613 2017 19,658 3,323 2018 11,753 2,196 2019 10,542 1,885 2020 8,456 1,337 Thereafter 23,685 9,377 Total $ 81,207 $ 19,731

Debt Obligations (Tables)

Debt Obligations (Tables)	9 Months Ended
	Sep. 30, 2016
Debt Disclosure [Abstract]
Consolidated debt obligations	The following table sets forth information regarding the Company’s consolidated debt obligations outstanding at September 30, 2016 and December 31, 2015 (in thousands): September 30, 2016 December 31, 2015 Effective Interest Rate Maturity Date MORTGAGE DEBT: 3141 Fairview Park Drive (a) $ - $ 20,838 4.25 % Jan 2017 Two Logan Square 86,395 86,886 3.98 % (b) May 2020 One Commerce Square 127,847 130,000 3.64 % Apr 2023 Two Commerce Square 112,000 112,000 4.51 % (c) Apr 2023 IRS Philadelphia Campus (d) - 177,425 7.00 % Sep 2030 Cira South Garage (d) - 35,546 7.12 % Sep 2030 Principal balance outstanding 326,242 562,695 Plus: fair market value premium (discount), net (2,870 ) (3,198 ) Less: deferred financing costs (749 ) (13,744 ) Mortgage indebtedness $ 322,623 $ 545,753 UNSECURED DEBT Seven-Year Term Loan - Swapped to fixed $ 250,000 $ 250,000 3.72 % Oct 2022 $250.0M 6.00% Guaranteed Notes due 2016 (e) - 149,919 5.95 % Apr 2016 $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 1,853,529 Plus: original issue premium (discount), net (4,932 ) (5,714 ) Less: deferred financing costs (7,740 ) (8,851 ) Total unsecured indebtedness $ 1,690,938 $ 1,838,964 Total Debt Obligations $ 2,013,561 $ 2,384,717 (a) On August 31, 2016, the Company deconsolidated 3141 Fairview Park Drive and began accounting for it under the equity method of accounting as part of Brandywine - AI Venture LLC, an unconsolidated real estate venture in which the Company holds a 50% interest. At December 31, 2015, this balance represented the full debt amount of the property, as it was consolidated at that time. See Note 4, “Investment in Unconsolidated Real Estate Ventures,” (b) On April 7, 2016, the Company closed on an $86.9 million first mortgage financing on Two Logan Square, a 708,844-square foot office property located in Philadelphia, Pennsylvania. Proceeds of the loan were used to repay, without penalty, the $86.6 million principal balance of the former Two Logan Square first mortgage loan, which had a 7.57% effective interest rate. (c) This loan was assumed upon acquisition of Two Commerce Square 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, and a default under the One Commerce Square loan will also constitute a default under this loan. This loan is also secured by a lien on One Commerce Square and the lien on Two Commerce Square. (d) On January 14, 2016, the Company funded $265.8 million to prepay two mortgage loans, consisting of $176.9 million of principal repayment, $44.5 million in prepayment charges and a nominal amount of accrued interest, in repayment of the mortgage indebtedness on the office property located at 2970 Market Street in Philadelphia, Pennsylvania commonly known as 30 th (e) On April 1, 2016, the entire principal balance of the 2016 6.00% Guaranteed Unsecured Notes was repaid upon maturity. Available cash balances were used to fund the repayment of the unsecured notes.

Fair Value of Financial Instr31

Fair Value of Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2016
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): September 30, 2016 December 31, 2015 Carrying Amount Fair Value Carrying Amount Fair Value Unsecured notes payable $ 1,364,312 $ 1,415,520 $ 1,512,554 $ 1,529,346 Variable rate debt $ 326,626 $ 305,301 $ 326,410 $ 305,522 Mortgage notes payable $ 322,623 $ 339,471 $ 545,753 $ 597,377 Note receivable (a) $ 3,365 $ 3,365 $ - $ -

Fair Value of Derivative Fina32

Fair Value of Derivative Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2016
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value	The following table summarizes the terms and fair values of the Company’s derivative financial instruments as of September 30, 2016 and December 31, 2015. 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 liabilities on the Company’s consolidated balance sheets). Hedge Product Hedge Type Designation Notional Amount Strike Trade Date Maturity Date Fair value 9/30/2016 12/31/2015 9/30/2016 12/31/2015 (Liabilities) / Assets Swap Interest Rate Cash Flow (a) $ 250,000 $ 250,000 3.718 % October 8, 2015 October 8, 2022 $ (8,122 ) $ 1,884 Swap Interest Rate Cash Flow (a) 25,774 25,774 3.300 % December 22, 2011 January 30, 2021 (1,058 ) (531 ) Swap Interest Rate Cash Flow (a) 25,774 25,774 3.090 % January 6, 2012 October 30, 2019 (663 ) (388 ) Swap Interest Rate Cash Flow (a) 27,062 27,062 2.750 % December 21, 2011 September 30, 2017 (156 ) (201 ) $ 328,610 $ 328,610 (a) Hedging unsecured variable rate debt.

Beneficiaries Equity of the P33

Beneficiaries Equity of the Parent Company (Tables)	9 Months Ended
	Sep. 30, 2016
Equity [Abstract]
Earnings Per Share (EPS), Basic and Diluted	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 September 30, 2016 2015 Basic Diluted Basic Diluted Numerator Income from continuing operations $ 7,884 $ 7,884 $ 20,308 $ 20,308 Net income from continuing operations attributable to non-controlling interests (58 ) (58 ) (161 ) (161 ) Nonforfeitable dividends allocated to unvested restricted shareholders (79 ) (79 ) (76 ) (76 ) Preferred share dividends (1,725 ) (1,725 ) (1,725 ) (1,725 ) Net income attributable to common shareholders $ 6,022 $ 6,022 $ 18,346 $ 18,346 Denominator Weighted-average shares outstanding 175,127,110 175,127,110 178,188,037 178,188,037 Contingent securities/Share based compensation - 1,237,505 - 588,647 Weighted-average shares outstanding 175,127,110 176,364,615 178,188,037 178,776,684 Earnings per Common Share: Net income attributable to common shareholders $ 0.03 $ 0.03 $ 0.10 $ 0.10 Nine-month periods ended September 30, 2016 2015 Basic Diluted Basic Diluted Numerator Income from continuing operations $ 52,871 $ 52,871 $ 31,960 $ 31,960 Net income from continuing operations attributable to non-controlling interests (425 ) (425 ) (221 ) (221 ) Nonforfeitable dividends allocated to unvested restricted shareholders (263 ) (263 ) (253 ) (253 ) Preferred share dividends (5,175 ) (5,175 ) (5,175 ) (5,175 ) Net income attributable to common shareholders $ 47,008 $ 47,008 $ 26,311 $ 26,311 Denominator Weighted-average shares outstanding 174,976,998 174,976,998 179,198,714 179,198,714 Contingent securities/Share based compensation - 1,032,824 - 789,778 Weighted-average shares outstanding 174,976,998 176,009,822 179,198,714 179,988,492 Earnings per Common Share: Net income attributable to common shareholders $ 0.27 $ 0.27 $ 0.15 $ 0.15

Partners Equity of the Operat34

Partners Equity of the Operating Partnership (Tables)	9 Months Ended
	Sep. 30, 2016
Earnings Per Share (EPS), Basic and Diluted	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 September 30, 2016 2015 Basic Diluted Basic Diluted Numerator Income from continuing operations $ 7,884 $ 7,884 $ 20,308 $ 20,308 Net income from continuing operations attributable to non-controlling interests (58 ) (58 ) (161 ) (161 ) Nonforfeitable dividends allocated to unvested restricted shareholders (79 ) (79 ) (76 ) (76 ) Preferred share dividends (1,725 ) (1,725 ) (1,725 ) (1,725 ) Net income attributable to common shareholders $ 6,022 $ 6,022 $ 18,346 $ 18,346 Denominator Weighted-average shares outstanding 175,127,110 175,127,110 178,188,037 178,188,037 Contingent securities/Share based compensation - 1,237,505 - 588,647 Weighted-average shares outstanding 175,127,110 176,364,615 178,188,037 178,776,684 Earnings per Common Share: Net income attributable to common shareholders $ 0.03 $ 0.03 $ 0.10 $ 0.10 Nine-month periods ended September 30, 2016 2015 Basic Diluted Basic Diluted Numerator Income from continuing operations $ 52,871 $ 52,871 $ 31,960 $ 31,960 Net income from continuing operations attributable to non-controlling interests (425 ) (425 ) (221 ) (221 ) Nonforfeitable dividends allocated to unvested restricted shareholders (263 ) (263 ) (253 ) (253 ) Preferred share dividends (5,175 ) (5,175 ) (5,175 ) (5,175 ) Net income attributable to common shareholders $ 47,008 $ 47,008 $ 26,311 $ 26,311 Denominator Weighted-average shares outstanding 174,976,998 174,976,998 179,198,714 179,198,714 Contingent securities/Share based compensation - 1,032,824 - 789,778 Weighted-average shares outstanding 174,976,998 176,009,822 179,198,714 179,988,492 Earnings per Common Share: Net income attributable to common shareholders $ 0.27 $ 0.27 $ 0.15 $ 0.15
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Earnings Per Share (EPS), Basic and Diluted	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 September 30, 2016 2015 Basic Diluted Basic Diluted Numerator Income from continuing operations $ 7,884 $ 7,884 $ 20,308 $ 20,308 Nonforfeitable dividends allocated to unvested restricted unitholders (79 ) (79 ) (76 ) (76 ) Preferred unit dividends (1,725 ) (1,725 ) (1,725 ) (1,725 ) Net income attributable to non-controlling interests (6 ) (6 ) (1 ) (1 ) Net income attributable to common unitholders $ 6,074 $ 6,074 $ 18,506 $ 18,506 Denominator Weighted-average units outstanding 176,606,909 176,606,909 179,723,139 179,723,139 Contingent securities/Share based compensation - 1,237,505 - 588,647 Total weighted-average units outstanding 176,606,909 177,844,414 179,723,139 180,311,786 Earnings per Common Partnership Unit: Net income attributable to common unitholders $ 0.03 $ 0.03 $ 0.10 $ 0.10 Nine-month periods ended September 30, 2016 2015 Basic Diluted Basic Diluted Numerator Income from continuing operations $ 52,871 $ 52,871 $ 31,960 $ 31,960 Nonforfeitable dividends allocated to unvested restricted unitholders (263 ) (263 ) (253 ) (253 ) Preferred unit dividends (5,175 ) (5,175 ) (5,175 ) (5,175 ) Net (income) loss attributable to non-controlling interests (12 ) (12 ) 4 4 Net income attributable to common unitholders $ 47,421 $ 47,421 $ 26,536 $ 26,536 Denominator Weighted-average units outstanding 176,491,311 176,491,311 180,733,816 180,733,816 Contingent securities/Share based compensation - 1,032,824 - 789,778 Total weighted-average units outstanding 176,491,311 177,524,135 180,733,816 181,523,594 Earnings per Common Partnership Unit: Net income attributable to common unitholders $ 0.27 $ 0.27 $ 0.15 $ 0.15

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2016
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: September 30, 2016 December 31, 2015 Philadelphia CBD (a) $ 1,321,079 $ 1,157,667 Pennsylvania Suburbs 1,011,490 1,019,280 Metropolitan Washington, D.C. (b) 999,549 1,129,206 Austin, Texas (c) 146,794 164,518 Other (d), (e) 207,427 222,329 $ 3,686,339 $ 3,693,000 Assets held for sale (f), (g) 16,916 794,588 Operating Properties $ 3,703,255 $ 4,487,588 Corporate Construction-in-progress $ 249,183 $ 268,983 Land held for development $ 155,297 $ 130,479 (a) The increase primarily relates to the office component of the FMC Tower at Cira Centre South being placed into service during the second quarter of 2016. See Note 3, "Real Estate Investments," (b) The decrease primarily relates to the sale of Herndon Metro Plaza I & II. See Note 3, "Real Estate Investments," (c) The decrease primarily relates to a building from the Broadmoor Austin portfolio being placed into redevelopment during the three-month period ended June 30, 2016. (d) The decrease primarily relates to the sale of the office property at 1120 Executive Boulevard in Mount Laurel, New Jersey and the held for sale classification of Oakland Lot B in Oakland, California. See Note 3, "Real Estate Investments," (e) As a result of the Och-Ziff Sale that occurred on February 4, 2016, the Company narrowed its segments to five segments: (1) Pennsylvania Suburbs, (2) Philadelphia Central Business District (“CBD”), (3) Metropolitan Washington, D.C. and (4) Austin, Texas and (5) Other. The Och-Ziff Sale disposed of the entire Richmond, Virginia segment. Subsequent to the Och-Ziff Sale, the segments previously defined as New Jersey/Delaware and California are now being managed as a consolidated segment entitled “Other,” as these geographies no longer provide a significant revenue contribution. Accordingly, the chief operating decision maker revised the management structure, reallocated resources, and is assessing business operations of the five segments as of January 1, 2016. ( f ) As of December 31, 2015, the office property located at 2970 Market Street in Philadelphia, Pennsylvania commonly known as 30 th "Real Estate Investments," ( g ) As of December 31, 2015, the 58 properties associated with the series of related transactions with Och-Ziff Real Estate were classified as held for sale on the consolidated balance sheets. On February 4, 2016, the Company completed a series of transactions, resulting in the disposition of the properties. See Note 3, “Real Estate Investments,” Real Estate Investments 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 September 30, 2016 2015 Total revenue Operating expenses (a) Net operating income (loss) Total revenue Operating expenses (a) Net operating income Philadelphia CBD $ 50,744 $ (19,071 ) $ 31,673 $ 52,203 $ (18,750 ) $ 33,453 Pennsylvania Suburbs 35,763 (11,247 ) 24,516 39,507 (14,004 ) 25,503 Metropolitan Washington, D.C. 24,251 (9,900 ) 14,351 27,587 (10,792 ) 16,795 Austin, Texas (b) 8,726 (3,523 ) 5,203 8,533 (2,625 ) 5,908 Other (c) 8,526 (4,837 ) 3,689 24,275 (12,061 ) 12,214 Corporate (d) 1,684 (2,739 ) (1,055 ) 480 (386 ) 94 Operating Properties $ 129,694 $ (51,317 ) $ 78,377 $ 152,585 $ (58,618 ) $ 93,967 Nine-month periods ended September 30, 2016 2015 Total revenue Operating expenses (a) Net operating income Total revenue Operating expenses (a) Net operating income Philadelphia CBD $ 148,496 $ (58,102 ) $ 90,394 $ 157,595 $ (56,587 ) $ 101,008 Pennsylvania Suburbs 107,971 (36,982 ) 70,989 118,407 (41,286 ) 77,121 Metropolitan Washington, D.C. 76,881 (29,567 ) 47,314 81,947 (33,197 ) 48,750 Austin, Texas (b) 25,123 (9,689 ) 15,434 11,999 (4,993 ) 7,006 Other (c) 30,328 (17,513 ) 12,815 76,129 (38,238 ) 37,891 Corporate (d) 4,578 (4,460 ) 118 2,562 (1,364 ) 1,198 Operating Properties $ 393,377 $ (156,313 ) $ 237,064 $ 448,639 $ (175,665 ) $ 272,974 (a) Includes property operating expense, real estate taxes and third party management expense. (b) On June 22, 2015 the Company acquired the remaining 50.0% interest in Broadmoor Austin Associates. As such, the Company has seven wholly owned properties in its Austin, Texas business segment at June 30, 2016. In addition, net operating income for the three and nine months ended September 30, 2016 and 2015 includes management fees and related expenses for services provided by the Company to the Austin Venture (c) See footnote (e) to the “Real estate investments, at cost” table above for further information regarding this segment. (d) Increase in revenue and operating expenses primarily relates to the third party management operations of the Subaru Headquarters Development and third party management of the MAP Venture. Unconsolidated real estate ventures (in thousands): Investment in real estate ventures, at equity Equity in income (loss) of real estate ventures As of Three-month periods ended September 30, Nine-month periods ended September 30, September 30, 2016 December 31, 2015 2016 2015 2016 2015 Philadelphia CBD (a) $ 48,904 $ 44,089 $ (453 ) $ (186 ) $ (473 ) $ (636 ) Pennsylvania Suburbs 15,025 16,408 (170 ) (120 ) 410 (142 ) Metropolitan Washington, D.C. (b) 140,219 118,422 (5,287 ) (343 ) (6,068 ) (572 ) MAP Venture (c) 22,503 - (1,010 ) - (2,608 ) - Other (d) 1,554 1,657 227 173 715 669 Austin, Texas (e) 53,957 60,428 (561 ) (617 ) (1,299 ) (1,154 ) Total $ 282,162 $ 241,004 $ (7,254 ) $ (1,093 ) $ (9,323 ) $ (1,835 ) (a) Net increase of investment of $4.8 million primary relates to the evo at Cira real estate venture. See Note 4, “ Investment in Unconsolidated Real Estate Ventures, (b) On August 31, 2016, the Company terminated its lease for the regional management and leasing office at 3141 Fairview Park Drive, located in Falls Church, Virginia. Accordingly, the Company no longer has any continuing involvement with 3141 Fairview Park Drive and recorded the partial sale under the full accrual method of accounting. As a result, the Company deconsolidated net assets of $45.6 million, a mortgage loan of $20.6 million and a financing liability of $12.4 million related to the property from its consolidated balance sheet and recorded a $12.6 million equity method investment to the Company’s Brandywine - AI Venture LLC, in which the Company owns a 50% interest. See Note 4, “Investment in Unconsolidated Real Estate Ventures,” (c) 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. See Note 4 “ Investment in Unconsolidated Real Estate Ventures, (d) See footnote (e) to the “Real estate investments, at cost” table above for further information regarding this segment. (e) Investment in real estate ventures does not include the $1.1 million negative investment balance in one real estate venture as of December 31, 2015, which is included in other liabilities. The Company disposed of its interest in this venture during the three-month period ended March 31, 2016. See Note 4, " Investment in Unconsolidated Real Estate Ventures
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 September 30, Nine-month periods ended September 30, 2016 2015 2016 2015 Consolidated net operating income $ 78,377 $ 93,967 $ 237,064 $ 272,974 Less: Interest expense (20,814 ) (27,900 ) (64,334 ) (83,971 ) Interest expense - amortization of deferred financing costs (645 ) (1,010 ) (2,063 ) (3,377 ) Interest expense - financing obligation (156 ) (296 ) (679 ) (906 ) Depreciation and amortization (46,956 ) (58,314 ) (142,736 ) (160,355 ) General and administrative expenses (5,515 ) (6,127 ) (20,711 ) (21,554 ) Equity in loss of real estate ventures (7,254 ) (1,093 ) (9,323 ) (1,835 ) Provision for impairment - - (13,069 ) (2,508 ) Loss on early extinguishment of debt - - (66,590 ) - Plus: Interest income 291 126 970 1,189 Tax credit transaction income - 11,853 - 11,853 Net gain (loss) on disposition of real estate (104 ) 6,083 114,625 16,673 Net gain on sale of undepreciated real estate 188 3,019 188 3,019 Net gain from remeasurement of investment in a real estate venture - - - 758 Net gain on Real Estate Venture transactions 10,472 - 19,529 - Net income $ 7,884 $ 20,308 $ 52,871 $ 31,960

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2016
Commitments And Contingencies Disclosure [Abstract]
Minimum Future Rental Payments on Non-cancelable Leases	Minimum future rental payments on non-cancelable leases at September 30, 2016 are as follows (in thousands): Year Minimum Rent 2016 (three months remaining) $ 444 2017 1,333 2018 1,333 2019 1,333 2020 1,333 Thereafter 67,411 Total $ 73,187

Organization of The Parent Co37

Organization of The Parent Company and The Operating Partnership (Textual) (Details)	Sep. 30, 2016	Sep. 30, 2016property	Sep. 30, 2016ft²	Sep. 30, 2016Real_Estate_Investment	Sep. 30, 2016a	Sep. 30, 2016Apartment_unit	Feb. 04, 2016property
Organization of The Parent Company and The Operating Partnership [Line Items]
Number of Properties		117
Office Properties [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Number of Properties		99
Rentable Square Feet | ft²			5,082,963
Mixed Use Properties [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Number of Properties		7
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		107
Development Property [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Number of Properties		4
Redevelopment Properties [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Number of Properties		2
Assets Held-for-sale [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Number of Properties		4
Assets Held-for-sale [Member] | Office Properties [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Number of Properties		3
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				14
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			8,000,000
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
Number of Unconsolidated Investments in Real Estate Ventures		1
Unconsolidated Real Estate Ventures [Member] | One Real Estate Venture [Member] | Apartment Complex [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		398				398
MAP Venture [Member] | Industrial Properties [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Number of Properties		4					20
Parent Company [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Ownership in the Operating Partnership	99.10%
Net Rentable Square Feet | ft²			17,800,000
Area Owned by Company of Undeveloped Parcels of Land | a					317
Area of Additional Undeveloped Parcels of Land With Option to Purchase | a					60
Total Potential Development Capacity | ft²			12,300,000
Wholly-owned Management Company Subsidiaries [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Net Rentable Square Feet | ft²			28,700,000
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			10,900,000
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			17,800,000
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			10,900,000

Real Estate Investments - Gross

Real Estate Investments - Gross Carrying Value of Properties (Details) - USD ($) $ in Thousands		Sep. 30, 2016	Dec. 31, 2015
Property, Plant and Equipment, Gross [Abstract]
Land		$ 488,580	$ 513,268
Tenant improvements		635,783	459,952
Operating properties		3,686,339	3,693,000
Assets held for sale - real estate investments	[1],[2]	16,916	794,588
Total		3,703,255	4,487,588
Building and Improvements [Member]
Property, Plant and Equipment, Gross [Abstract]
Operating properties		$ 2,561,976	$ 2,719,780
[1]	As of December 31, 2015, the 58 properties associated with the series of related transactions with Och-Ziff Real Estate were classified as held for sale on the consolidated balance sheets. On February 4, 2016, the Company completed a series of transactions, resulting in the disposition of the properties. See Note 3, “Real Estate Investments,” for further information regarding the disposition. Additionally, as of September 30, 2016, the Company categorized three office properties located on Allendale Road in King of Prussia, Pennsylvania and one property located in Oakland, California known as Oakland Lot B as held for sale in accordance with applicable accounting standards for long lived assets. See Note 3, “Real Estate Investments,” for further information.
[2]	As of December 31, 2015, the office property located at 2970 Market Street in Philadelphia, Pennsylvania commonly known as 30th Street Main Post Office (“Cira Square”) was classified as held for sale on the consolidated balance sheets. The Company disposed of its interests in the property on February 5, 2016. See Note 3, "Real Estate Investments," for further information.

Real Estate Investments - Acqui

Real Estate Investments - Acquisitions (Textual) (Details) $ in Thousands	Jul. 02, 2016USD ($)a	Sep. 30, 2016USD ($)	Sep. 30, 2015USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Amount funded by corporate funds		$ 20,406	$ 141,303
Garza Land Acquisition [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Acreage of land | a	34.6
Gross purchase value of assets	$ 20,600
Acquisition costs	1,900
Amount funded by corporate funds	$ 20,406
Area of land under agreement to sell | a	9.5

Real Estate Investments - Summa

Real Estate Investments - Summary of Office Properties Sold (Details) $ in Thousands		Feb. 04, 2016property	Sep. 30, 2016USD ($)ft²	Sep. 30, 2015USD ($)	Sep. 30, 2016USD ($)ft²property		Sep. 30, 2015USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net Proceeds on Sale					$ 758,931		$ 152,243
Gain (Loss) on Sale			$ (104)	$ 6,083	$ 114,625		$ 16,673
Office Building [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Number of Properties Sold | property					63
Rentable Square Feet | ft²			5,082,963		5,082,963
Sales Price			$ 807,200		$ 807,200
Net Proceeds on Sale					757,785
Gain (Loss) on Sale	[1]				$ 114,601
Office Building [Member] | 1120 Executive Plaza [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Number of Properties Sold | property					1
Rentable Square Feet | ft²			95,183		95,183
Sales Price			$ 9,500		$ 9,500
Net Proceeds on Sale					9,241
Gain (Loss) on Sale	[1],[2]				$ (18)
Office Building [Member] | 50 East Clementon Road [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Number of Properties Sold | property					1
Rentable Square Feet | ft²			3,080		3,080
Sales Price			$ 1,100		$ 1,100
Net Proceeds on Sale					1,011
Gain (Loss) on Sale	[1]				$ (85)
Office Building [Member] | 196/198 Van Buren Street (Herndon Metro Plaza I&II) [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Number of Properties Sold | property					2
Rentable Square Feet | ft²			197,225		197,225
Sales Price			$ 44,500		$ 44,500
Net Proceeds on Sale					43,412
Gain (Loss) on Sale	[1],[3]				$ (752)
Office Building [Member] | 2970 Market Street (Cira Square) [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Number of Properties Sold | property					1
Rentable Square Feet | ft²			862,692		862,692
Sales Price			$ 354,000		$ 354,000
Net Proceeds on Sale					350,150
Gain (Loss) on Sale	[1]				$ 115,828
Office Building [Member] | Och Ziff Portfolio [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Number of Properties Sold | property		58			58	[4]
Rentable Square Feet | ft²	[4]		3,924,783		3,924,783
Sales Price	[4]		$ 398,100		$ 398,100
Net Proceeds on Sale	[4]				353,971
Gain (Loss) on Sale	[1],[4],[5]				$ (372)
[1]	Gain/(Loss) on Sale is net of closing and other transaction related costs.
[2]	As of June 30, 2016, the Company determined that the sale of the property was probable and classified this property as held for sale in accordance with applicable accounting standards for long lived assets. At such date, the carrying value of the property exceeded the fair value less the anticipated costs of sale. As a result, the Company recognized a provision for impairment totaling approximately $1.8 million during the three-month period ended June 30, 2016. The fair value measurement was based on the pricing in the purchase and sale agreement. As the pricing in the purchase and sale agreement is unobservable, the Company determined that the inputs utilized to determine fair value for this 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 loss on sale represents additional closing costs recognized at settlement.
[3]	During the three-month period ended March 31, 2016, the Company recognized a provision for impairment totaling approximately $7.4 million on the properties. See “Held for Use Impairment” section below. The loss on sale primarily relates to additional closing costs recognized at settlement.
[4]	Exhibit 99.2 to the Company’s Current Report on Form 8-K filed on February 10, 2016 contains a complete list of the 58 properties disposed of in the transactions with Och-Ziff Capital Management Group LLC. See Note 4, "Investment in Unconsolidated Real Estate Ventures," for further details of the transactions.
[5]	During the three-month period ended December 31, 2015, the Company recognized a provision for impairment totaling approximately $45.4 million. The loss on sale represents additional closing costs recognized at settlement.

Real Estate Investments - Sum41

Real Estate Investments - Summary of Office Properties Sold (Parenthetical) (Details) $ in Thousands	Feb. 04, 2016property	Sep. 30, 2016USD ($)	Jun. 30, 2016USD ($)	Mar. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Sep. 30, 2015USD ($)	Sep. 30, 2016USD ($)property		Sep. 30, 2015USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Provision for impairment | $		$ 0	$ 1,800			$ 0	$ 13,069		$ 2,508
Office Properties [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Number of Properties Sold | property							63
Office Properties [Member] | 196/198 Van Buren Street (Herndon Metro Plaza I&II) [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Impairment of properties held for use | $				$ 7,400
Number of Properties Sold | property							2
Office Properties [Member] | Och Ziff Portfolio [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Number of Properties Sold | property	58						58	[1]
Provision for impairment on assets held for sale | $					$ 45,400
[1]	Exhibit 99.2 to the Company’s Current Report on Form 8-K filed on February 10, 2016 contains a complete list of the 58 properties disposed of in the transactions with Och-Ziff Capital Management Group LLC. See Note 4, "Investment in Unconsolidated Real Estate Ventures," for further details of the transactions.

Real Estate Investments - Dispo

Real Estate Investments - Dispositions (Textual) (Details)	Aug. 19, 2016USD ($)Parcel	Sep. 30, 2016USD ($)property	Jun. 30, 2016USD ($)	Mar. 31, 2016USD ($)property	Dec. 31, 2015USD ($)	Sep. 30, 2015USD ($)	Sep. 30, 2016USD ($)property	Sep. 30, 2015USD ($)	Jan. 15, 2016USD ($)Parcel
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Gain (Loss) on Sale		$ (104,000)				$ 6,083,000	$ 114,625,000	$ 16,673,000
Number of Properties | property		117					117
Held for Sale Properties Included in Continuing Operations [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Provision for impairment on assets held for sale							$ 0
Number of Properties | property		4					4
Mt.Laurel, New Jersey [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Number of Parcels | Parcel	2
Sales Price	$ 300,000
Proceeds from sale of land	300,000
Gain (Loss) on Sale	$ 200,000
Pennsylvania Suburbs [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Number of Parcels | Parcel									120
Sales Price									$ 900,000
Gain (Loss) on Sale							$ 0
Provision for impairment on assets held for sale					$ 300,000
Metropolitan DC [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Impairment of properties held for use		$ 0	$ 3,900,000	$ 7,400,000
Carrying value of real estate prior to impairment			37,400,000	51,900,000
Aggregate carrying value			$ 33,500,000	$ 44,500,000
Impairment Hold Period			10 years	10 years
Residual Capitalization Rates			7.75%	7.00%
Discount Rates			8.25%	7.00%
Number of Properties | property				2

Real Estate Investments - Sum43

Real Estate Investments - Summary of Properties Classified as Held for Sale Included in Continuing Operations (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
ASSETS HELD FOR SALE
Operating properties	$ 16,916
Accumulated depreciation	(4,524)
Operating real estate investments, net	12,392
Construction-in-progress	212
Total real estate investments, net	12,604
Other assets	0
Total assets held for sale, net	12,604	$ 584,365
LIABILITIES HELD FOR SALE
Other liabilities	49
Total liabilities held for sale	49	$ 2,151
Held for Sale Properties Included in Continuing Operations [Member] | 620, 640 and 660 Allendale Road [Member]
ASSETS HELD FOR SALE
Operating properties	12,550
Accumulated depreciation	(4,520)
Operating real estate investments, net	8,030
Construction-in-progress	212
Total real estate investments, net	8,242
Other assets	0
Total assets held for sale, net	8,242
LIABILITIES HELD FOR SALE
Other liabilities	49
Total liabilities held for sale	49
Held for Sale Properties Included in Continuing Operations [Member] | Oakland Lot B [Member]
ASSETS HELD FOR SALE
Operating properties	4,366
Accumulated depreciation	(4)
Operating real estate investments, net	4,362
Construction-in-progress	0
Total real estate investments, net	4,362
Other assets	0
Total assets held for sale, net	4,362
LIABILITIES HELD FOR SALE
Other liabilities	0
Total liabilities held for sale	$ 0

Investment in Unconsolidated 44

Investment in Unconsolidated Real Estate Ventures (Textual) (Details)		Oct. 24, 2016USD ($)	Sep. 22, 2016USD ($)	Aug. 31, 2016USD ($)	Aug. 19, 2016USD ($)	Jun. 30, 2016USD ($)ft²	Jun. 10, 2016USD ($)	Mar. 02, 2016USD ($)	Feb. 04, 2016USD ($)ft²property	Jan. 29, 2016USD ($)	Sep. 30, 2016USD ($)	Jun. 30, 2016USD ($)ft²	Sep. 30, 2015USD ($)	Sep. 30, 2016USD ($)property	Sep. 30, 2015USD ($)	Sep. 30, 2016	Sep. 30, 2016property	Sep. 30, 2016ft²	Sep. 30, 2016Real_Estate_Investment	Sep. 30, 2016a	Sep. 30, 2016Apartment_unit	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)aStoreyBed	Sep. 30, 2014aStoreyBed	Jan. 25, 2013USD ($)a	Jul. 10, 2012USD ($)ft²property	Dec. 20, 2011property
Schedule Of Equity Method Investments [Line Items]
Management fees											$ 6,248,000		$ 4,274,000	$ 17,691,000	$ 12,805,000
Accounts receivable											9,925,000			9,925,000								$ 17,126,000
Deconsolidated mortgage loan														20,582,000	0
Deconsolidated financing liability														12,384,000	0
Investment in Real Estate Ventures, equity method											282,162,000			282,162,000								241,004,000
Capital funded to venture for mortgage debt														27,174,000	62,868,000
Repayment of mortgage debt														302,514,000	10,598,000
Number of Properties | property																	117
Proceeds from sale of real estate venture														20,551,000	0
Net gain on Real Estate Venture transactions											10,472,000		0	19,529,000	0
Advance received for refinancing														195,000,000	0
Cash distribution from unconsolidated real estate ventures														12,565,000	7,401,000
Proceeds from the sale of properties														758,931,000	152,243,000
Gain (Loss) on Sale											(104,000)		6,083,000	114,625,000	16,673,000
TB-BDN Plymouth Apartments [Member]
Schedule Of Equity Method Investments [Line Items]
Construction Loan											56,000,000			56,000,000
Guarantor obligations, current carrying value											3,200,000			3,200,000
1919 Venture [Member]
Schedule Of Equity Method Investments [Line Items]
Guarantor obligations, current carrying value											88,900,000			88,900,000
Office Properties [Member]
Schedule Of Equity Method Investments [Line Items]
Rentable Square Feet | ft²																		5,082,963
Number of Properties | property																	99
Sales Price											807,200,000			$ 807,200,000
Number of Properties Sold | property														63
Proceeds from the sale of properties														$ 757,785,000
Gain (Loss) on Sale	[1]													114,601,000
Office Properties [Member] | 3141 Fairview Park Drive [Member]
Schedule Of Equity Method Investments [Line Items]
Rentable Square Feet | ft²																		587,317
Real Estate Venture [Member]
Schedule Of Equity Method Investments [Line Items]
Management fees											6,200,000		$ 4,300,000	17,700,000	$ 12,800,000
Accounts receivable											1,100,000			1,100,000								1,700,000
Unconsolidated Real Estate Ventures [Member]
Schedule Of Equity Method Investments [Line Items]
Number of Unconsolidated Investments in Real Estate Ventures | Real_Estate_Investment																			14
Equity Method Investments including net liabilities											282,200,000			282,200,000
Investment in Real Estate Ventures, equity method	[2],[3]										282,162,000			282,162,000								241,004,000
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																		8,000,000
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
Unconsolidated Real Estate Ventures [Member] | One Real Estate Venture [Member] | Apartment Complex [Member]
Schedule Of Equity Method Investments [Line Items]
Number of Unconsolidated Investments in Real Estate Ventures | Real_Estate_Investment																			1
Number of Property units																	398				398
Brandywine - AI Venture LLC [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investment percentage																											50.00%
Provision for impairment of investment in real estate ventures														10,400,000
Brandywine - AI Venture LLC [Member] | Current Creek Investments, LLC [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investment percentage																											50.00%
Brandywine - AI Venture LLC [Member] | 3141 Fairview Park Drive [Member]
Schedule Of Equity Method Investments [Line Items]
Deconsolidated net assets				$ 45,600,000
Deconsolidated mortgage loan				20,582,000
Deconsolidated financing liability				12,384,000
Investment in Real Estate Ventures, equity method				$ 12,600,000
Recognizing gain or loss on sale												$ 0
Capital funded to venture for mortgage debt														10,300,000
Brandywine - AI Venture LLC [Member] | 3141 Fairview Park Drive [Member] | Subsequent Event [Member]
Schedule Of Equity Method Investments [Line Items]
Repayment of mortgage debt		$ 20,600,000
Brandywine - AI Venture LLC [Member] | Station Square [Member]
Schedule Of Equity Method Investments [Line Items]
Rentable Square Feet | ft²																										497,896
Equity method investment percentage																										50.00%
Provision for impairment of investment in real estate ventures														10,400,000
Number of Properties | property																										3
Cost of equity method investment																										$ 120,600,000
Equity method investment other than temporary impairment charge														5,200,000
Brandywine - AI Venture LLC [Member] | Remaining Properties in Real Estate Venture [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investment other than temporary impairment charge														0
Brandywine - AI Venture LLC [Member] | Office Properties [Member] | 3141 Fairview Park Drive [Member]
Schedule Of Equity Method Investments [Line Items]
Number of office properties owned | property																											3
PJP V [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investment percentage			25.00%
Proceeds from sale of real estate venture			$ 3,400,000
Equity in income (loss) of Real Estate Ventures			200,000
Net gain on Real Estate Venture transactions			$ 3,200,000
PJP V [Member] | Office Properties [Member]
Schedule Of Equity Method Investments [Line Items]
Rentable Square Feet | ft²																		73,997
Invesco Venture [Member]
Schedule Of Equity Method Investments [Line Items]
Equity in income (loss) of Real Estate Ventures					$ 0
Net gain on Real Estate Venture transactions					7,000,000
Amount of proceeds, net of closing costs					$ 7,000,000
1000 Chesterbrook [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investment percentage						50.00%						50.00%
Proceeds from sale of real estate venture						$ 9,800,000
Net gain on Real Estate Venture transactions						3,200,000
Sales Price						32,100,000						$ 32,100,000
Debt assumed by buyer						$ 23,200,000
Working capital contribution											200,000			$ 200,000
1000 Chesterbrook [Member] | One Real Estate Venture [Member] | Office Properties [Member]
Schedule Of Equity Method Investments [Line Items]
Net Rentable Square Feet | ft²						172,286						172,286
evo at Cira Centre South Venture [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investment percentage								50.00%																	30.00%
Investment in Real Estate Ventures, equity method								$ 28,300,000
Equity Method Investment, Underlying Equity in Net Assets																							$ 0		$ 8,500,000
Area of developed parcels of land (in acres) owned by a Real Estate Venture | a																							0	1	1
Number of floors of a building | Storey																							0	33
Student housing bed capacity | Bed																							0	850
Percent of share of contribution made on real estate venture																							100.00%		0.00%
Construction Loan							$ 97,800,000																$ 97,800,000		$ 0
Cash paid to acquire real estate ventures								$ 12,800,000
Equity method investment percentage of interests acquired by the Company and HSRE								30.00%
Debt instrument maturity date							Jul. 25, 2016
Cash distribution from unconsolidated real estate ventures							$ 6,300,000
evo at Cira Centre South Venture [Member] | Secured Debt [Member]
Schedule Of Equity Method Investments [Line Items]
Debt instrument maturity date							Oct. 31, 2019
Term loans							$ 117,000,000
Debt instrument, description of variable rate basis														LIBOR + 2.25
Debt instrument optional extended maturity date							Jun. 30, 2021
Advance received for refinancing							$ 105,000,000
Additional capacity under the term loan may be funded if certain criterion relating to the operating performance of the student housing tower are met							$ 12,000,000
evo at Cira Centre South Venture [Member] | Secured Debt [Member] | LIBOR [Member]
Schedule Of Equity Method Investments [Line Items]
Debt instrument, basis spread on variable rate							2.25%
evo at Cira Centre South Venture [Member] | Campus Crest Properties, LLC [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investment percentage																									30.00%
evo at Cira Centre South Venture [Member] | HSRE, LLC [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investment percentage								50.00%																	40.00%
Cash paid to acquire real estate ventures								$ 6,600,000
evo at Cira Centre South Venture [Member] | Maximum [Member] | Secured Debt [Member]
Schedule Of Equity Method Investments [Line Items]
Effective interest rate							5.25%
MAP Venture [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Schedule Of Equity Method Investments [Line Items]
Rentable Square Feet | ft²									3,924,783
Equity method investment percentage									50.00%
Sales Price									$ 398,100,000
Number of Properties Sold | property									58
Percentage of fee interests in land sold									100.00%
Ground lease annual payments														$ 11,900,000
Ground lease annual rent expense increase percentage																2.50%
Reassessment period for change in ground lease annual payments														10 years
Ground Lease Terms														Annual payments by the MAP Venture, as tenant under the Ground Leases, initially total $11.9 million and increase 2.5% annually through November 2025.
Non-Recourse Debt									$ 180,800,000
Proceeds from the sale of properties									354,000,000
Ownership percentage value									$ 25,200,000
Coppell Associates [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investment percentage										50.00%
Proceeds from sale of real estate venture										$ 4,600,000
Gain (Loss) on Sale										5,700,000
Coppell Associates [Member] | Other Liabilities [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investment percentage																50.00%
Investment in Real Estate Ventures, equity method										$ 1,100,000	0			$ 0								$ 1,100,000
PJP VII [Member]
Schedule Of Equity Method Investments [Line Items]
Guarantor obligations, current carrying value											$ 500,000			$ 500,000
[1]	Gain/(Loss) on Sale is net of closing and other transaction related costs.
[2]	Does not include the negative investment balance in one real estate venture totaling $1.1 million as of December 31, 2015, which is included in other liabilities. There is no negative investment balance as of September 30, 2016 because the Company sold its entire remaining 50% interest in the applicable real estate venture (See “Coppell Associates” section below) during the three month period ended March 31, 2016.
[3]	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.

Investment in Unconsolidated 45

Investment in Unconsolidated Real Estate Ventures - Summary of Financial Position of Real Estate Ventures (Details) - USD ($) $ in Thousands		Sep. 30, 2016	Dec. 31, 2015
Schedule Of Equity Method Investments [Line Items]
Company's share of equity (Company's basis)		$ 282,162	$ 241,004
Unconsolidated Real Estate Ventures [Member]
Schedule Of Equity Method Investments [Line Items]
Net property		1,463,500	1,258,999
Other assets		270,892	158,672
Other liabilities		124,949	69,028
Debt, net		1,007,062	794,571
Equity		602,381	554,072
Company's share of equity (Company's basis)	[1],[2]	$ 282,162	$ 241,004
[1]	Does not include the negative investment balance in one real estate venture totaling $1.1 million as of December 31, 2015, which is included in other liabilities. There is no negative investment balance as of September 30, 2016 because the Company sold its entire remaining 50% interest in the applicable real estate venture (See “Coppell Associates” section below) during the three month period ended March 31, 2016.
[2]	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.

Investment in Unconsolidated 46

Investment in Unconsolidated Real Estate Ventures - Summary of Financial Position of Real Estate Ventures (Parenthetical) (Details) - Coppell Associates [Member] - USD ($) $ in Millions	Sep. 30, 2016	Jan. 29, 2016	Dec. 31, 2015
Schedule Of Equity Method Investments [Line Items]
Equity method investment percentage		50.00%
Other Liabilities [Member]
Schedule Of Equity Method Investments [Line Items]
Investment in Real Estate Ventures, equity method	$ 0	$ 1.1	$ 1.1
Equity method investment percentage	50.00%

Investment in Unconsolidated 47

Investment in Unconsolidated Real Estate Ventures - Summary of Results of Operations of Real Estate Ventures with Interests (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Schedule Of Equity Method Investments [Line Items]
Equity in loss of Real Estate Ventures		$ (7,254)	$ (1,093)	$ (9,323)	$ (1,835)
Unconsolidated Real Estate Ventures [Member]
Schedule Of Equity Method Investments [Line Items]
Revenue		57,710	37,076	157,641	126,424
Operating expenses		(27,592)	(16,917)	(81,347)	(54,581)
Provision for impairment	[1]	(10,476)	0	(10,476)	0
Interest expense, net		(12,102)	(7,936)	(32,019)	(27,918)
Depreciation and amortization		(22,722)	(15,681)	(63,125)	(52,218)
Net loss	[2]	(15,182)	(3,458)	(29,326)	(8,293)
Equity in loss of Real Estate Ventures		$ (7,254)	$ (1,093)	$ (9,323)	$ (1,835)
[1]	During the period ended September 30, 2016, Brandywine-AI Venture LLC recorded a property level impairment charge of $10.4 million. See additional details in the “Station Square Impairment” disclosure below.
[2]	The nine-month period ended September 30, 2016 amount includes $7.1 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 48

Investment in Unconsolidated Real Estate Ventures - Summary of Results of Operations of Real Estate Ventures with Interests (Parenthetical) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Mar. 31, 2016	Sep. 30, 2016
Brandywine - AI Venture LLC [Member]
Schedule Of Equity Method Investments [Line Items]
Provision for impairment of investment in real estate ventures		$ 10.4
MAP Venture [Member]
Schedule Of Equity Method Investments [Line Items]
Acquisition deal costs	$ 7.1

Intangible Assets and Liabili49

Intangible Assets and Liabilities - Intangible Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Intangible Assets [Line Items]
Intangible Assets, Total Cost	$ 162,709	$ 183,872
Intangible Assets, Accumulated Amortization	(81,502)	(72,249)
Intangible Assets, net	81,207	111,623
Acquired Lease Intangibles, Gross	37,731	48,956
Acquired Lease Intangibles, Accumulated Amortization	(18,000)	(23,301)
Acquired Lease Intangibles, Net	19,731	25,655
Below market leases [Member]
Intangible Assets [Line Items]
Acquired Lease Intangibles, Gross		50,025
Acquired Lease Intangibles, Accumulated Amortization		(24,178)
Acquired Lease Intangibles, Net		25,847
Liabilities of assets held for sale [Member]
Intangible Assets [Line Items]
Acquired Lease Intangibles, Gross		1,069
Acquired Lease Intangibles, Accumulated Amortization		(877)
Acquired Lease Intangibles, Net		192
In-place lease value [Member]
Intangible Assets [Line Items]
Intangible Assets, Total Cost	143,856	161,276
Intangible Assets, Accumulated Amortization	(68,400)	(57,063)
Intangible Assets, net	75,456	104,213
Tenant relationship value [Member]
Intangible Assets [Line Items]
Intangible Assets, Total Cost	14,135	20,117
Intangible Assets, Accumulated Amortization	(10,938)	(15,580)
Intangible Assets, net	3,197	4,537
Above market leases acquired [Member]
Intangible Assets [Line Items]
Intangible Assets, Total Cost	4,718	5,333
Intangible Assets, Accumulated Amortization	(2,164)	(1,879)
Intangible Assets, net	$ 2,554	3,454
Intangible assets including assets held for sale [Member]
Intangible Assets [Line Items]
Intangible Assets, Total Cost		186,726
Intangible Assets, Accumulated Amortization		(74,522)
Intangible Assets, net		112,204
Assets held for sale [Member]
Intangible Assets [Line Items]
Intangible Assets, Total Cost		2,854
Intangible Assets, Accumulated Amortization		(2,273)
Intangible Assets, net		$ 581

Intangible Assets and Liabili50

Intangible Assets and Liabilities - Annual Amortization of Intangible Assets, Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Assets
2016 (three months remaining)	$ 7,113
2,017	19,658
2,018	11,753
2,019	10,542
2,020	8,456
Thereafter	23,685
Intangible Assets, net	81,207	$ 111,623
Liabilities
2016 (three months remaining)	1,613
2,017	3,323
2,018	2,196
2,019	1,885
2,020	1,337
Thereafter	9,377
Acquired Lease Intangibles, Net	$ 19,731	$ 25,655

Debt Obligations - Consolidated

Debt Obligations - Consolidated Debt Obligations Outstanding (Details) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2016	Apr. 02, 2016	Dec. 31, 2015
Consolidated debt obligations
Total Debt Obligations		$ 2,013,561		$ 2,384,717
Secured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross		326,242		562,695
Plus: premiums/(discounts), net		(2,870)		(3,198)
Less: deferred financing costs		(749)		(13,744)
Total mortgage indebtedness		322,623		545,753
Unsecured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross		1,703,610		1,853,529
Plus: premiums/(discounts), net		(4,932)		(5,714)
Less: deferred financing costs		$ (7,740)		(8,851)
Effective interest rate			6.00%
3141 Fairview Eleven Tower [Member] | Secured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	[1]			20,838
Effective interest rate	[1]	4.25%
Debt instrument maturity date	[1]	Jan. 1, 2017
Two Logan Square [Member] | Secured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross		$ 86,395		86,886
Effective interest rate	[2]	3.98%
Debt instrument maturity date		May 1, 2020
One Commerce Square [Member] | Secured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross		$ 127,847		130,000
Effective interest rate		3.64%
Debt instrument maturity date		Apr. 5, 2023
Two Commerce Square [Member] | Secured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross		$ 112,000		112,000
Effective interest rate	[3]	4.51%
Debt instrument maturity date		Apr. 5, 2023
IRS Philadelphia Campus [Member] | Secured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	[4]	$ 0		177,425
Effective interest rate	[4]	7.00%
Debt instrument maturity date	[4]	Sep. 10, 2030
Cira South Garage [Member] | Secured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	[4]	$ 0		35,546
Effective interest rate	[4]	7.12%
Debt instrument maturity date	[4]	Sep. 10, 2030
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. 1, 2022
$250.0M 6.00% Guaranteed Notes due 2016 [Member] | Unsecured Debt [Member]
Consolidated debt obligations
Long-term Debt, Gross	[5]			149,919
Effective interest rate	[5]	5.95%
Debt instrument maturity date	[5]	Apr. 1, 2016
$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		Apr. 1, 2016
$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		May 1, 2017
$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		Apr. 15, 2018
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		Feb. 15, 2023
$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. 1, 2024
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		$ 25,774
Effective interest rate		3.09%
Debt instrument maturity date		Jul. 30, 2035
[1]	On August 31, 2016, the Company deconsolidated 3141 Fairview Park Drive and began accounting for it under the equity method of accounting as part of Brandywine - AI Venture LLC, an unconsolidated real estate venture in which the Company holds a 50% interest. At December 31, 2015, this balance represented the full debt amount of the property, as it was consolidated at that time. See Note 4, “Investment in Unconsolidated Real Estate Ventures,” for further details.
[2]	On April 7, 2016, the Company closed on an $86.9 million first mortgage financing on Two Logan Square, a 708,844-square foot office property located in Philadelphia, Pennsylvania. Proceeds of the loan were used to repay, without penalty, the $86.6 million principal balance of the former Two Logan Square first mortgage loan, which had a 7.57% effective interest rate.
[3]	This loan was assumed upon acquisition of Two Commerce Square 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, and a default under the One Commerce Square loan will also constitute a default under this loan. This loan is also secured by a lien on One Commerce Square and the lien on Two Commerce Square.
[4]	(a) On January 14, 2016, the Company funded $265.8 million to prepay two mortgage loans, consisting of $176.9 million of principal repayment, $44.5 million in prepayment charges and a nominal amount of accrued interest, in repayment of the mortgage indebtedness on the office property located at 2970 Market Street in Philadelphia, Pennsylvania commonly known as 30th Street Main Post Office (“Cira Square”), ahead of its scheduled maturity date of September 10, 2030. Also on January 14, 2016, the Company funded $44.4 million, consisting of $35.5 million of principal repayment, $8.9 million in prepayment charges and a nominal amount of accrued interest, in repayment of the mortgage indebtedness of a 1,662 parking space facility located in Philadelphia, Pennsylvania commonly known as (“Cira South Garage”), ahead of its scheduled maturity date of September 10, 2030.  These repayments were financed with $195.0 million of funds available under the unsecured revolving credit facility with the remaining balance funded through available cash balances. The Company recognized a $66.6 million loss on extinguishment of debt, consisting of the prepayment charges along with $10.8 million and $2.4 million related to non-cash charges for deferred financing costs for Cira Square and Cira South Garage, respectively.
[5]	On April 1, 2016, the entire principal balance of the 2016 6.00% Guaranteed Unsecured Notes was repaid upon maturity. Available cash balances were used to fund the repayment of the unsecured notes.

Debt Obligations - Consolidat52

Debt Obligations - Consolidated Debt Obligations Outstanding (Parenthetical) (Details) $ in Thousands		Apr. 07, 2016USD ($)ft²	Jan. 14, 2016USD ($)ft²	Sep. 30, 2016USD ($)	Sep. 30, 2015USD ($)	Sep. 30, 2016USD ($)	Sep. 30, 2015USD ($)	Apr. 02, 2016	Dec. 31, 2015USD ($)	Dec. 20, 2011
Debt Instrument [Line Items]
Mortgage notes payable, net				$ 322,623		$ 322,623			$ 545,753
Loss on early extinguishment of debt - deferred financing costs						13,157	$ 0
Loss on early extinguishment of debt			$ (66,600)	0	$ 0	(66,590)	$ 0
Unsecured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Repayments of debt			195,000
Secured Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross				326,242		326,242			562,695
Secured Debt [Member] | Cira Square and Cira South Garage [Member]
Debt Instrument [Line Items]
Extinguishment of Debt, Amount			265,800
Secured Debt [Member] | Cira Square [Member]
Debt Instrument [Line Items]
Repayments of debt			176,900
Repayment of prepayment charges			$ 44,500
Debt instrument maturity date			Sep. 10, 2030
Loss on early extinguishment of debt - deferred financing costs			$ 10,800
Secured Debt [Member] | Cira South Garage [Member]
Debt Instrument [Line Items]
Extinguishment of Debt, Amount			44,400
Repayments of debt			35,500
Repayment of prepayment charges			$ 8,900
Debt instrument maturity date			Sep. 10, 2030
Number of Parking Spaces | ft²			1,662
Loss on early extinguishment of debt - deferred financing costs			$ 2,400
Unsecured Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross				$ 1,703,610		$ 1,703,610			1,853,529
Effective interest rate								6.00%
First Mortgage [Member | Mortgage Loans over $1,000,000 [Member] | Office Building at Two Logan Square [Member]
Debt Instrument [Line Items]
Mortgage notes payable, net		$ 86,900
Net Rentable Square Feet | ft²		708,844
Former First Mortgage [Member] | Mortgage Loans over $1,000,000 [Member] | Office Building at Two Logan Square [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 86,600
Loan interest rate		7.57%
Brandywine - AI Venture LLC [Member]
Debt Instrument [Line Items]
Equity method investment percentage										50.00%
3141 Fairview Eleven Tower [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	[1]								$ 20,838
Debt instrument maturity date	[1]					Jan. 1, 2017
Effective interest rate	[1]			4.25%		4.25%
3141 Fairview Eleven Tower [Member] | Brandywine - AI Venture LLC [Member]
Debt Instrument [Line Items]
Equity method investment percentage				50.00%		50.00%
[1]	On August 31, 2016, the Company deconsolidated 3141 Fairview Park Drive and began accounting for it under the equity method of accounting as part of Brandywine - AI Venture LLC, an unconsolidated real estate venture in which the Company holds a 50% interest. At December 31, 2015, this balance represented the full debt amount of the property, as it was consolidated at that time. See Note 4, “Investment in Unconsolidated Real Estate Ventures,” for further details.

Debt Obligations (Textual) (Det

Debt Obligations (Textual) (Details) - USD ($)	May 15, 2015	Sep. 30, 2016	Dec. 31, 2015
Unsecured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt term	4 years
Maximum borrowing capacity	$ 600,000,000
Line of credit		$ 0
Secured Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate		4.03%	5.72%
Long-term Debt, Gross		$ 326,242,000	$ 562,695,000

Fair Value of Financial Instr54

Fair Value of Financial Instruments - Financial Instruments for which Estimates of Fair Value Differ from Carrying Amounts (Details) - USD ($) $ in Thousands		Sep. 30, 2016	Dec. 31, 2015
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Mortgage notes payable, net		$ 322,623	$ 545,753
Carrying Amount [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Note receivable	[1]	3,365	0
Carrying Amount [Member] | Unsecured Notes Payable [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Unsecured notes payable		1,364,312	1,512,554
Carrying Amount [Member] | Variable Rate Debt [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Variable rate debt		326,626	326,410
Carrying Amount [Member] | Mortgages Notes Payable [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Mortgage notes payable, net		322,623	545,753
Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Note receivable, fair value	[1]	3,365	0
Fair Value [Member] | Unsecured Notes Payable [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Debt instrument, fair value		1,415,520	1,529,346
Fair Value [Member] | Variable Rate Debt [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Debt instrument, fair value		305,301	305,522
Fair Value [Member] | Mortgages Notes Payable [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Debt instrument, fair value		$ 339,471	$ 597,377
[1]	A note receivable is included in other assets on the Company’s consolidated balance sheet. The note was given to an unaffiliated third party to facilitate their acquisition and development of an industrial facility located in Pennsauken, New Jersey. The loan matures three years after the payment commencement date, which is 90 days after substantial completion of the development, and bears interest at 6.3% during year one, 7.0% during year two and 8.0% during year three. The Company evaluated its investment in the note receivable under ASC 310, Receivables and determined that the loan was provided at market terms and the Company does not participate in the residual profit of the unaffiliated third party. Accordingly, the investment was appropriately classified on the Company’s balance sheet as a note receivable. As the note was originated during the third quarter of 2016, the fair value approximates the carrying value. The inputs to originate the loan are unobservable and, as a result, are categorized as Level 3.

Fair Value of Financial Instr55

Fair Value of Financial Instruments - Financial Instruments for which Estimates of Fair Value Differ from Carrying Amounts (Parenthetical) (Details)	9 Months Ended
	Sep. 30, 2016
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Loan maturity term	3 years
Note Receivable Year One [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Loan bears interest rate	6.30%
Note Receivable Year Two [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Loan bears interest rate	7.00%
Note Receivable Year Three [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Loan bears interest rate	8.00%

Fair Value of Financial Instr56

Fair Value of Financial Instruments (Textual) (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Variable rate and mortgage debt [Member]
Fair Value Inputs Liabilities Quantitative Information [Line Items]
Discount Rates	4.494%	4.55%

Limited Partners' Non-Control57

Limited Partners' Non-Controlling Interests in the Parent Company (Textual) (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Noncontrolling Interest [Abstract]
Aggregate amount related to non-controlling interests classified within equity	$ 15.2	$ 16.1
Settlement value of non controlling interest in operating partnership	$ 23.1	$ 21

Fair Value of Derivative Fina58

Fair Value of Derivative Financial Instruments - Terms and Fair Values of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
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]
Notional Amount	$ 250,000	250,000
Derivative, Fixed Interest Rate	3.718%
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	$ (8,122)
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		1,884
3.300% Interest Rate Swap Maturing January 30, 2021 [Member] | Cash Flow Hedging [Member]
Derivatives Fair Value [Line Items]
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	$ (1,058)	(531)
3.090% Interest Rate Swap Maturing October 30, 2019 [Member] | Cash Flow Hedging [Member]
Derivatives Fair Value [Line Items]
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	$ (663)	(388)
2.750% Interest Rate Swap Maturing September 30, 2017 [Member] | Cash Flow Hedging [Member]
Derivatives Fair Value [Line Items]
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	$ (156)	$ (201)

Beneficiaries Equity of the P59

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		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Numerator
Income from continuing operations	$ 7,884	$ 20,308	$ 52,871	$ 31,960
Net income from continuing operations attributable to non-controlling interests	(58)	(161)	(425)	(221)
Nonforfeitable dividends allocated to unvested restricted shareholders	(79)	(76)	(263)	(253)
Distribution to preferred shareholders	(1,725)	(1,725)	(5,175)	(5,175)
Net income attributable to Common Share/Unit holders of entity	6,022	18,346	47,008	26,311
Net income attributable to common share/unit holders, Diluted	$ 6,022	$ 18,346	$ 47,008	$ 26,311
Denominator
Basic weighted average shares outstanding (in shares)	175,127,110	178,188,037	174,976,998	179,198,714
Contingent securities/Share based compensation (in shares)	1,237,505	588,647	1,032,824	789,778
Diluted weighted average shares outstanding (in shares)	176,364,615	178,776,684	176,009,822	179,988,492
Earnings per Common Share:
Net income attributable to common shareholders, Basic (USD per share)	$ 0.03	$ 0.10	$ 0.27	$ 0.15
Net income attributable to common shareholders, Diluted (USD per share)	$ 0.03	$ 0.10	$ 0.27	$ 0.15

Beneficiaries Equity of the P60

Beneficiaries Equity of the Parent Company (Textual) (Details) - USD ($)	Sep. 13, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	Sep. 30, 2016	Jul. 22, 2015	Nov. 05, 2013
Class of Stock [Line Items]
Dividends, Common Stock	$ 28,300,000
Preferred Stock, Dividend Rate, Percentage				6.90%		6.90%
Dividends, Preferred Stock		$ 1,725,000	$ 1,725,000	$ 5,175,000	$ 5,175,000
Shares Authorized For Equity Offering Program									16,000,000
Authorized Amount								$ 100,000,000
Number of shares available for repurchase under the preexisting share repurchase program								539,200
Repurchased and Retired, Shares				0	4,701,302		5,209,437
Share Price				$ 12.90	$ 12.92
Repurchased and Retired, Value				$ 67,300,000	$ 60,817,000
Common shares price per share		$ 0.01		$ 0.01		$ 0.01	$ 0.01
Series E Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Dividend Rate, Percentage				6.90%
Preferred Stock, Liquidation Preference Per Share		$ 25		$ 25			$ 25
Dividends, Preferred Stock	$ 1,700,000
Dividend Declared [Member]
Class of Stock [Line Items]
Dividends Payable, Amount Per Share	$ 0.16
Redeemable Common Limited Partnership Units
Class of Stock [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share				1,479,799	1,535,102

Partners Equity of the Operat61

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		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Numerator
Income from continuing operations	$ 7,884	$ 20,308	$ 52,871	$ 31,960
Nonforfeitable dividends allocated to unvested restricted shareholders	(79)	(76)	(263)	(253)
Distribution to preferred shareholders	(1,725)	(1,725)	(5,175)	(5,175)
Net income attributable to Common Share/Unit holders of entity	6,022	18,346	47,008	26,311
Net income attributable to common share/unit holders, Diluted	$ 6,022	$ 18,346	$ 47,008	$ 26,311
Denominator
Basic weighted average shares outstanding (in shares)	175,127,110	178,188,037	174,976,998	179,198,714
Contingent securities/Share based compensation (in shares)	1,237,505	588,647	1,032,824	789,778
Diluted weighted average shares outstanding (in shares)	176,364,615	178,776,684	176,009,822	179,988,492
Earnings per Common Partnership Unit:
Net income attributable to common shareholders, Basic (USD per share)	$ 0.03	$ 0.10	$ 0.27	$ 0.15
Net income attributable to common shareholders, Diluted (USD per share)	$ 0.03	$ 0.10	$ 0.27	$ 0.15
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Numerator
Income from continuing operations	$ 7,884	$ 20,308	$ 52,871	$ 31,960
Nonforfeitable dividends allocated to unvested restricted shareholders	(79)	(76)	(263)	(253)
Distribution to preferred shareholders	(1,725)	(1,725)	(5,175)	(5,175)
Net (income) loss attributable to non-controlling interests	(6)	(1)	(12)	4
Net income attributable to Common Share/Unit holders of entity	6,074	18,506	47,421	26,536
Net income attributable to common share/unit holders, Diluted	$ 6,074	$ 18,506	$ 47,421	$ 26,536
Denominator
Basic weighted average shares outstanding (in shares)	176,606,909	179,723,139	176,491,311	180,733,816
Contingent securities/Share based compensation (in shares)	1,237,505	588,647	1,032,824	789,778
Diluted weighted average shares outstanding (in shares)	177,844,414	180,311,786	177,524,135	181,523,594
Earnings per Common Partnership Unit:
Net income attributable to common shareholders, Basic (USD per share)	$ 0.03	$ 0.10	$ 0.27	$ 0.15
Net income attributable to common shareholders, Diluted (USD per share)	$ 0.03	$ 0.10	$ 0.27	$ 0.15

Partners Equity of the Operat62

Partners Equity of the Operating Partnership (Textual) (Details) - USD ($) $ / shares in Units, $ in Thousands	Sep. 13, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
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	$ 5,175	$ 5,175
BRANDYWINE OPERATING PARTNERSHIP, L.P.
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	$ 5,175	$ 5,175
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
6.90% Series E-linked Preferred Units [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P.
Class of Stock [Line Items]
Preferred Stock, Dividend Rate, Percentage				6.90%
Preferred Stock, Liquidation Preference Per Share		$ 25		$ 25
Dividends, Preferred Stock	$ 1,700

Segment Information (Textual) (

Segment Information (Textual) (Details) - segment	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Segment Reporting [Abstract]
Number of Reportable Segments	5	7

Segment Information - Real Esta

Segment Information - Real Estate Investments, at Cost of Company's Reportable Segments (Details) - USD ($) $ in Thousands		Sep. 30, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Operating properties		$ 3,686,339	$ 3,693,000
Assets held for sale	[1],[2]	16,916	794,588
Total		3,703,255	4,487,588
Construction-in-progress		249,183	268,983
Land held for development		155,297	130,479
Philadelphia CBD [Member]
Segment Reporting Information [Line Items]
Operating properties	[3]	1,321,079	1,157,667
Pennsylvania Suburbs [Member]
Segment Reporting Information [Line Items]
Operating properties		1,011,490	1,019,280
Metropolitan DC [Member]
Segment Reporting Information [Line Items]
Operating properties	[4]	999,549	1,129,206
Austin, Texas [Member]
Segment Reporting Information [Line Items]
Operating properties	[5]	146,794	164,518
Other [Member]
Segment Reporting Information [Line Items]
Operating properties	[6],[7]	$ 207,427	$ 222,329
[1]	As of December 31, 2015, the 58 properties associated with the series of related transactions with Och-Ziff Real Estate were classified as held for sale on the consolidated balance sheets. On February 4, 2016, the Company completed a series of transactions, resulting in the disposition of the properties. See Note 3, “Real Estate Investments,” for further information regarding the disposition. Additionally, as of September 30, 2016, the Company categorized three office properties located on Allendale Road in King of Prussia, Pennsylvania and one property located in Oakland, California known as Oakland Lot B as held for sale in accordance with applicable accounting standards for long lived assets. See Note 3, “Real Estate Investments,” for further information.
[2]	As of December 31, 2015, the office property located at 2970 Market Street in Philadelphia, Pennsylvania commonly known as 30th Street Main Post Office (“Cira Square”) was classified as held for sale on the consolidated balance sheets. The Company disposed of its interests in the property on February 5, 2016. See Note 3, "Real Estate Investments," for further information.
[3]	The increase primarily relates to the office component of the FMC Tower at Cira Centre South being placed into service during the second quarter of 2016. See Note 3, "Real Estate Investments," for further information.
[4]	The decrease primarily relates to the sale of Herndon Metro Plaza I & II. See Note 3, "Real Estate Investments," for further information.
[5]	The decrease primarily relates to a building from the Broadmoor Austin portfolio being placed into redevelopment during the three-month period ended June 30, 2016.
[6]	As a result of the Och-Ziff Sale that occurred on February 4, 2016, the Company narrowed its segments to five segments: (1) Pennsylvania Suburbs, (2) Philadelphia Central Business District (“CBD”), (3) Metropolitan Washington, D.C. and (4) Austin, Texas and (5) Other. The Och-Ziff Sale disposed of the entire Richmond, Virginia segment. Subsequent to the Och-Ziff Sale, the segments previously defined as New Jersey/Delaware and California are now being managed as a consolidated segment entitled “Other,” as these geographies no longer provide a significant revenue contribution. Accordingly, the chief operating decision maker revised the management structure, reallocated resources, and is assessing business operations of the five segments as of January 1, 2016.
[7]	The decrease primarily relates to the sale of the office property at 1120 Executive Boulevard in Mount Laurel, New Jersey and the held for sale classification of Oakland Lot B in Oakland, California. See Note 3, "Real Estate Investments," for further information.

Segment Information - Real Es65

Segment Information - Real Estate Investments, at Cost of Company's Reportable Segments (Parenthetical) (Details) - property	Sep. 30, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Number of Properties	117
Office Properties [Member]
Segment Reporting Information [Line Items]
Number of Properties	99
Held for Sale Properties Included in Continuing Operations [Member]
Segment Reporting Information [Line Items]
Number of Properties	4
Held for Sale Properties Included in Continuing Operations [Member] | Office Properties [Member]
Segment Reporting Information [Line Items]
Number of Properties	3
Cira Square [Member] | Held for Sale Properties Included in Continuing Operations [Member]
Segment Reporting Information [Line Items]
Number of Properties		58
620, 640 and 660 Allendale Road [Member] | Held for Sale Properties Included in Continuing Operations [Member] | Office Properties [Member]
Segment Reporting Information [Line Items]
Number of Properties	1
Oakland Lot B [Member] | Held for Sale Properties Included in Continuing Operations [Member] | Office Properties [Member]
Segment Reporting Information [Line Items]
Number of Properties	1
Marine Center Piers [Member] | Held for Sale Properties Included in Continuing Operations [Member] | Office Properties [Member]
Segment Reporting Information [Line Items]
Number of Properties	1

Segment Information - Net Opera

Segment Information - Net Operating Income of Company's Reportable Segments (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Total revenue		$ 129,694	$ 152,585	$ 393,377	$ 448,639
Operating expenses	[1]	(51,317)	(58,618)	(156,313)	(175,665)
Net operating income		78,377	93,967	237,064	272,974
Operating Segments [Member] | Philadelphia CBD [Member]
Segment Reporting Information [Line Items]
Total revenue		50,744	52,203	148,496	157,595
Operating expenses	[1]	(19,071)	(18,750)	(58,102)	(56,587)
Net operating income		31,673	33,453	90,394	101,008
Operating Segments [Member] | Pennsylvania Suburbs [Member]
Segment Reporting Information [Line Items]
Total revenue		35,763	39,507	107,971	118,407
Operating expenses	[1]	(11,247)	(14,004)	(36,982)	(41,286)
Net operating income		24,516	25,503	70,989	77,121
Operating Segments [Member] | Metropolitan DC [Member]
Segment Reporting Information [Line Items]
Total revenue		24,251	27,587	76,881	81,947
Operating expenses	[1]	(9,900)	(10,792)	(29,567)	(33,197)
Net operating income		14,351	16,795	47,314	48,750
Operating Segments [Member] | Austin, Texas [Member]
Segment Reporting Information [Line Items]
Total revenue	[2]	8,726	8,533	25,123	11,999
Operating expenses	[1],[2]	(3,523)	(2,625)	(9,689)	(4,993)
Net operating income	[2]	5,203	5,908	15,434	7,006
Operating Segments [Member] | Other [Member]
Segment Reporting Information [Line Items]
Total revenue	[3]	8,526	24,275	30,328	76,129
Operating expenses	[1],[3]	(4,837)	(12,061)	(17,513)	(38,238)
Net operating income	[3]	3,689	12,214	12,815	37,891
Corporate [Member]
Segment Reporting Information [Line Items]
Total revenue	[4]	1,684	480	4,578	2,562
Operating expenses	[1],[4]	(2,739)	(386)	(4,460)	(1,364)
Net operating income	[4]	$ (1,055)	$ 94	$ 118	$ 1,198
[1]	Includes property operating expense, real estate taxes and third party management expense.
[2]	On June 22, 2015 the Company acquired the remaining 50.0% interest in Broadmoor Austin Associates. As such, the Company has seven wholly owned properties in its Austin, Texas business segment at June 30, 2016. In addition, net operating income for the three and nine months ended September 30, 2016 and 2015 includes management fees and related expenses for services provided by the Company to the Austin Venture.
[3]	See footnote (e) to the “Real estate investments, at cost” table above for further information regarding this segment.
[4]	Increase in revenue and operating expenses primarily relates to the third party management operations of the Subaru Headquarters Development and third party management of the MAP Venture.

Segment Information - Net Ope67

Segment Information - Net Operating Income of Company's Reportable Segments (Parenthetical) (Details) - property	Sep. 30, 2016	Jun. 30, 2016	Jun. 22, 2015
Segment Reporting Information [Line Items]
Number of Properties	117
Austin, Texas [Member]
Segment Reporting Information [Line Items]
Number of Properties		7
Broadmoor Austin Associates [Member]
Segment Reporting Information [Line Items]
Percentage of ownership interests			50.00%

Segment Information - Unconsoli

Segment Information - Unconsolidated Real Estate Ventures of Company's Reportable Segments (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Investment in Real Estate Ventures, at equity		$ 282,162		$ 282,162		$ 241,004
Equity in loss of Real Estate Ventures		(7,254)	$ (1,093)	(9,323)	$ (1,835)
Philadelphia CBD [Member]
Segment Reporting Information [Line Items]
Investment in Real Estate Ventures, at equity	[1]	48,904		48,904		44,089
Equity in loss of Real Estate Ventures	[1]	(453)	(186)	(473)	(636)
Pennsylvania Suburbs [Member]
Segment Reporting Information [Line Items]
Investment in Real Estate Ventures, at equity		15,025		15,025		16,408
Equity in loss of Real Estate Ventures		(170)	(120)	410	(142)
Metropolitan DC [Member]
Segment Reporting Information [Line Items]
Investment in Real Estate Ventures, at equity	[2]	140,219		140,219		118,422
Equity in loss of Real Estate Ventures	[2]	(5,287)	(343)	(6,068)	(572)
MAP Venture [Member]
Segment Reporting Information [Line Items]
Investment in Real Estate Ventures, at equity	[3]	22,503		22,503		0
Equity in loss of Real Estate Ventures	[3]	(1,010)	0	(2,608)	0
Other [Member]
Segment Reporting Information [Line Items]
Investment in Real Estate Ventures, at equity	[4]	1,554		1,554		1,657
Equity in loss of Real Estate Ventures	[4]	227	173	715	669
Austin, Texas [Member]
Segment Reporting Information [Line Items]
Investment in Real Estate Ventures, at equity	[5]	53,957		53,957		$ 60,428
Equity in loss of Real Estate Ventures	[5]	$ (561)	$ (617)	$ (1,299)	$ (1,154)
[1]	Net increase of investment of $4.8 million primary relates to the evo at Cira real estate venture. See Note 4, “Investment in Unconsolidated Real Estate Ventures,” for further information.
[2]	On August 31, 2016, the Company terminated its lease for the regional management and leasing office at 3141 Fairview Park Drive, located in Falls Church, Virginia. Accordingly, the Company no longer has any continuing involvement with 3141 Fairview Park Drive and recorded the partial sale under the full accrual method of accounting. As a result, the Company deconsolidated net assets of $45.6 million, a mortgage loan of $20.6 million and a financing liability of $12.4 million related to the property from its consolidated balance sheet and recorded a $12.6 million equity method investment to the Company’s Brandywine - AI Venture LLC, in which the Company owns a 50% interest. See Note 4, “Investment in Unconsolidated Real Estate Ventures,” for details.
[3]	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. See Note 4 “Investment in Unconsolidated Real Estate Ventures,” to our consolidated financial statements for further information. 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.
[4]	See footnote (e) to the “Real estate investments, at cost” table above for further information regarding this segment.
[5]	Investment in real estate ventures does not include the $1.1 million negative investment balance in one real estate venture as of December 31, 2015, which is included in other liabilities. The Company disposed of its interest in this venture during the three-month period ended March 31, 2016. See Note 4, "Investment in Unconsolidated Real Estate Ventures," for further information. The decrease to our investment balance primarily relates to distributions from the G&I VII Austin Office LLC real estate venture.

Segment Information - Unconso69

Segment Information - Unconsolidated Real Estate Ventures of Company's Reportable Segments (Parenthetical) (Details) - USD ($) $ in Thousands	Aug. 31, 2016	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Deconsolidated mortgage loan		$ 20,582	$ 0
Deconsolidated financing liability		12,384	$ 0
Other liabilities		31,399		$ 31,379
evo at Cira Centre South Venture [Member]
Segment Reporting Information [Line Items]
Net increase of investment in unconsolidated real estate ventures		$ 4,800
Brandywine - AI Venture LLC [Member] | 3141 Fairview Park Drive [Member]
Segment Reporting Information [Line Items]
Deconsolidated net assets	$ 45,600
Deconsolidated mortgage loan	20,582
Deconsolidated financing liability	$ 12,384
Coppell Associates [Member]
Segment Reporting Information [Line Items]
Other liabilities				$ 1,100

Segment Information - Reconcili

Segment Information - Reconciliation of Consolidated NOI to Consolidated Net Income (Loss) (Details) - USD ($) $ in Thousands	Jan. 14, 2016	Sep. 30, 2016	Jun. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting [Abstract]
Consolidated net operating income		$ 78,377		$ 93,967	$ 237,064	$ 272,974
Less:
Interest expense		(20,814)		(27,900)	(64,334)	(83,971)
Interest expense - amortization of deferred financing costs		(645)		(1,010)	(2,063)	(3,377)
Interest expense - financing obligation		(156)		(296)	(679)	(906)
Depreciation and amortization		(46,956)		(58,314)	(142,736)	(160,355)
General and administrative expenses		(5,515)		(6,127)	(20,711)	(21,554)
Equity in loss of real estate ventures		(7,254)		(1,093)	(9,323)	(1,835)
Provision for impairment		0	$ (1,800)	0	(13,069)	(2,508)
Loss on early extinguishment of debt	$ (66,600)	0		0	(66,590)	0
Plus:
Interest income		291		126	970	1,189
Tax credit transaction income		0		11,853	0	11,853
Net gain (loss) on disposition of real estate		(104)		6,083	114,625	16,673
Net gain on sale of undepreciated real estate		188		3,019	188	3,019
Net gain from remeasurement of investments in Real Estate Ventures		0		0	0	758
Net gain on Real Estate Venture transactions		10,472		0	19,529	0
Net income		$ 7,884		$ 20,308	$ 52,871	$ 31,960

Commitments and Contingencies71

Commitments and Contingencies (Textual) (Details) $ in Millions	Apr. 02, 2015USD ($)	Sep. 30, 2016USD ($)	Jul. 02, 2016USD ($)a	Dec. 03, 2015USD ($)
Property Subject to or Available for Operating Lease [Line Items]
Associated letter of credit		$ 10
Future capital expenditures for tenant improvements		36.4
Future capital expenditures for capital improvements		5.9
Development And Redevelopment [Member]
Property Subject to or Available for Operating Lease [Line Items]
Contractual obligations		144.3
Subaru of America [Member]
Property Subject to or Available for Operating Lease [Line Items]
NTE Amount				$ 77.3
TB-BDN Plymouth Apartments [Member]
Property Subject to or Available for Operating Lease [Line Items]
Guarantor obligations, current carrying value		3.2
Construction Loan		56
1919 Venture [Member]
Property Subject to or Available for Operating Lease [Line Items]
Guarantor obligations, current carrying value		88.9
PJP VII [Member]
Property Subject to or Available for Operating Lease [Line Items]
Guarantor obligations, current carrying value		0.5
A618 Market Street
Property Subject to or Available for Operating Lease [Line Items]
Contingent consideration, liability	$ 2	1.7
Fair value of contingent consideration	1.6
Interest expense	$ 2
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			9.5
Infrastructure improvements to land, estimated cost			$ 5.8
Put Option [Member]
Property Subject to or Available for Operating Lease [Line Items]
Purchase price		$ 35
Minimum [Member]
Property Subject to or Available for Operating Lease [Line Items]
Lease terms		5 years
Maximum [Member]
Property Subject to or Available for Operating Lease [Line Items]
Lease terms		73 years

Commitments and Contingencies -

Commitments and Contingencies - Minimum Future Rental Payments on Non-cancelable Leases (Details) $ in Thousands	Sep. 30, 2016USD ($)
Commitments And Contingencies Disclosure [Abstract]
2016 (three months remaining)	$ 444
2,017	1,333
2,018	1,333
2,019	1,333
2,020	1,333
Thereafter	67,411
Total	$ 73,187

Subsequent Events (Textual) (De

Subsequent Events (Textual) (Details) $ in Thousands		Oct. 13, 2016USD ($)ft²property	Sep. 30, 2016USD ($)ft²	Sep. 30, 2015USD ($)	Sep. 30, 2016USD ($)ft²property	Sep. 30, 2015USD ($)
Subsequent Event [Line Items]
Gain (Loss) on Sale			$ (104)	$ 6,083	$ 114,625	$ 16,673
Office Properties [Member]
Subsequent Event [Line Items]
Number of properties | property					63
Net rentable square feet | ft²			5,082,963		5,082,963
Gross sales price			$ 807,200		$ 807,200
Gain (Loss) on Sale	[1]				$ 114,601
Subsequent Event [Member] | Office Properties [Member] | 620, 640 and 660 Allendale Road [Member]
Subsequent Event [Line Items]
Number of properties | property		3
Net rentable square feet | ft²		156,669
Gross sales price		$ 12,800
Gain (Loss) on Sale		$ 2,400
[1]	Gain/(Loss) on Sale is net of closing and other transaction related costs.