Brandywine Operating Partnership 10-Q 27 Jul 15 2015 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information Document - shares	6 Months Ended
	Jun. 30, 2015	Jul. 24, 2015
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	Jun. 30, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		179,898,005
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	Jun. 30, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	Q2
Amendment Flag	false

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Real estate investments:
Operating properties	$ 4,700,839	$ 4,603,692
Accumulated depreciation	(1,088,681)	(1,067,829)
Operating real estate investments, net	3,612,158	3,535,863
Construction-in-progress	263,772	201,360
Land inventory	119,995	90,603
Total real estate investments, net	3,995,925	3,827,826
Cash and cash equivalents	123,982	257,502
Accounts receivable, net	22,294	18,757
Accrued rent receivable, net	138,905	134,051
Assets held for sale, net	0	18,295
Investment in Real Estate Ventures, at equity	201,034	225,004
Deferred costs, net	126,567	125,224
Intangible assets, net	137,290	99,403
Mortgage note receivable	0	88,000
Other assets	68,313	65,111
Total assets	4,814,310	4,859,173
LIABILITIES AND BENEFICIARIES’ EQUITY
Mortgage notes payable	646,512	654,590
Unsecured term loans	200,000	200,000
Unsecured senior notes, net of discounts	1,597,267	1,596,718
Accounts payable and accrued expenses	98,897	96,046
Distributions payable	29,021	28,871
Deferred income, gains and rent	54,595	59,452
Acquired lease intangibles, net	31,565	26,010
Other liabilities	40,647	37,558
Liabilities related to assets held for sale	0	602
Total liabilities	$ 2,698,504	$ 2,699,847
Commitments and contingencies
Brandywine Operating Partnership, L.P.’s equity:
6.90% Series E Preferred Shares, $0.01 par value; issued and outstanding- 4,000,000 in 2015 and 2014	$ 40	$ 40
Common Shares of Brandywine Realty Trust’s beneficial interest, $0.01 par value; shares authorized 400,000,000; 179,898,121 and 179,293,160 issued and outstanding in 2015 and 2014, respectively	1,799	1,793
Additional paid-in capital	3,317,751	3,314,693
Deferred compensation payable in common shares	11,996	6,219
Common shares in grantor trust, 748,045 in 2015 and 384,536 in 2014	(11,996)	(6,219)
Cumulative earnings	541,079	529,487
Accumulated other comprehensive loss	(5,651)	(4,607)
Cumulative distributions	(1,758,294)	(1,700,579)
Total Brandywine Realty Trust’s equity	2,096,724	2,140,827
Non-controlling interests	19,082	18,499
Total beneficiaries' equity	2,115,806	2,159,326
Total liabilities and beneficiaries' equity	4,814,310	4,859,173
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Real estate investments:
Operating properties	4,700,839	4,603,692
Accumulated depreciation	(1,088,681)	(1,067,829)
Operating real estate investments, net	3,612,158	3,535,863
Construction-in-progress	263,772	201,360
Land inventory	119,995	90,603
Total real estate investments, net	3,995,925	3,827,826
Cash and cash equivalents	123,982	257,502
Accounts receivable, net	22,294	18,757
Accrued rent receivable, net	138,905	134,051
Assets held for sale, net	0	18,295
Investment in Real Estate Ventures, at equity	201,034	225,004
Deferred costs, net	126,567	125,224
Intangible assets, net	137,290	99,403
Mortgage note receivable	0	88,000
Other assets	68,313	65,111
Total assets	4,814,310	4,859,173
LIABILITIES AND BENEFICIARIES’ EQUITY
Mortgage notes payable	646,512	654,590
Unsecured term loans	200,000	200,000
Unsecured senior notes, net of discounts	1,597,267	1,596,718
Accounts payable and accrued expenses	98,897	96,046
Distributions payable	29,021	28,871
Deferred income, gains and rent	54,595	59,452
Acquired lease intangibles, net	31,565	26,010
Other liabilities	40,647	37,558
Liabilities related to assets held for sale	0	602
Total liabilities	$ 2,698,504	$ 2,699,847
Commitments and contingencies
Redeemable limited partnership units at redemption value; 1,535,102 issued and outstanding in 2015 and 2014	$ 22,727	$ 24,571
Brandywine Operating Partnership, L.P.’s equity:
6.90% Series E Preferred Shares, $0.01 par value; issued and outstanding- 4,000,000 in 2015 and 2014	96,850	96,850
General Partnership Capital, 179,898,121 and 179,293,160 units issued and outstanding in 2015 and 2014, respectively	2,000,257	2,041,902
Accumulated other comprehensive loss	(6,058)	(5,007)
Total Brandywine Realty Trust’s equity	2,091,049	2,133,745
Non-controlling interests	2,030	1,010
Total beneficiaries' equity	2,093,079	2,134,755
Total liabilities and beneficiaries' equity	$ 4,814,310	$ 4,859,173

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - $ / shares	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
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	179,898,121	179,293,160
Common Stock, Shares, Outstanding	179,898,121	179,293,160
Common Shares in Grantor Trust	748,045	384,536
BRANDYWINE OPERATING PARTNERSHIP, L.P.
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	1,535,102	1,535,102
Redeemable Limited Partnership Units Outstanding	1,535,102	1,535,102
General Partners' Capital Account, Units Issued	179,898,121	179,293,160
General Partners' Capital Account, Units Outstanding	179,898,121	179,293,160

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015		Jun. 30, 2014
Revenue:
Rents	$ 119,127	$ 121,622	$ 239,537		$ 243,293
Tenant reimbursements	19,799	20,502	42,453		43,962
Termination fees	828	3,349	1,464		5,552
Third party management fees, labor reimbursement and leasing	4,659	4,187	8,531		8,337
Other	1,235	840	4,069		1,470
Total revenue	145,648	150,500	296,054		302,614
Operating expenses:
Property operating expenses	42,704	43,136	89,281		89,937
Real estate taxes	11,968	12,841	24,513		26,298
Third party management expenses	1,677	1,730	3,253		3,446
Depreciation and amortization	50,930	52,587	102,041		105,157
General and administrative expenses	6,791	6,005	15,427		14,186
Total operating expenses	114,070	116,299	234,515		239,024
Operating income	31,578	34,201	61,539		63,590
Other income (expense):
Interest income	313	385	1,063		770
Interest expense	(27,895)	(31,512)	(56,071)		(63,356)
Interest expense — amortization of deferred financing costs	(1,288)	(1,197)	(2,367)		(2,386)
Interest expense — financing obligation	(324)	(316)	(610)		(588)
Equity in loss of Real Estate Ventures	(873)	(489)	(742)		(247)
Net gain on disposition of real estate	1,571	0	10,590	[1]	0
Gain (loss) on sale of undepreciated real estate	0	(3)	0		1,184
Net gain from remeasurement of investments in real estate ventures	758	458	758		458
Loss on real estate venture transactions	0	(282)	0		(417)
Provision for impairment on assets held for sale/sold	(782)	0	(2,508)		0
Income (Loss) from continuing operations	3,058	1,245	11,652		(992)
Discontinued operations:
Income from discontinued operations	0	26	0		18
Net gain on disposition of discontinued operations	0	903	0		903
Total discontinued operations	0	929	0		921
Net income (loss)	3,058	2,174	11,652		(71)
Net loss from discontinued operations attributable to non-controlling interests — LP units	0	(10)	0		(10)
Net loss attributable to non-controlling interest — partners' share of consolidated real estate ventures	5	24	5		12
Net (income) loss attributable to non-controlling interests — LP units	(7)	5	(65)		49
Net (income) loss attributable to non-controlling interests	(2)	19	(60)		51
Net income (loss) attributable to Brandywine Realty Trust	3,056	2,193	11,592		(20)
Distribution to Preferred Shares	(1,725)	(1,725)	(3,450)		(3,450)
Nonforfeitable dividends allocated to unvested restricted shareholders	(76)	(83)	(177)		(186)
Net income (loss) attributable to Common Shareholders of Brandywine Realty Trust	$ 1,255	$ 385	$ 7,965		$ (3,656)
Basic income (loss) per Common Share:
Continuing operations (USD per share)	$ 0.01	$ 0	$ 0.04		$ (0.03)
Discontinued operations (USD per share)	0	0	0		0.01
Net income (loss) attributable to common shareholders, Basic (USD per share)	0.01	0	0.04		(0.02)
Diluted income (loss) per Common Share:
Continuing operations (USD per share)	0.01	0	0.04		(0.03)
Discontinued operations (USD per share)	0	0	0		0.01
Net income (loss) attributable to common shareholders, Diluted (USD per share)	$ 0.01	$ 0	$ 0.04		$ (0.02)
Basic weighted average shares outstanding (in shares)	179,860,284	157,037,348	179,712,428		156,916,356
Diluted weighted average shares outstanding (in shares)	180,538,887	157,037,348	180,599,265		156,916,356
Net income attributable to Brandywine Realty Trust
Total continuing operations	$ 3,056	$ 1,274	$ 11,592		$ (931)
Total discontinued operations	0	919	0		911
Net income (loss)	3,058	2,174	11,652		(71)
Net income (loss)	3,056	2,193	11,592		(20)
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Revenue:
Rents	119,127	121,622	239,537		243,293
Tenant reimbursements	19,799	20,502	42,453		43,962
Termination fees	828	3,349	1,464		5,552
Third party management fees, labor reimbursement and leasing	4,659	4,187	8,531		8,337
Other	1,235	840	4,069		1,470
Total revenue	145,648	150,500	296,054		302,614
Operating expenses:
Property operating expenses	42,704	43,136	89,281		89,937
Real estate taxes	11,968	12,841	24,513		26,298
Third party management expenses	1,677	1,730	3,253		3,446
Depreciation and amortization	50,930	52,587	102,041		105,157
General and administrative expenses	6,791	6,005	15,427		14,186
Total operating expenses	114,070	116,299	234,515		239,024
Operating income	31,578	34,201	61,539		63,590
Other income (expense):
Interest income	313	385	1,063		770
Interest expense	(27,895)	(31,512)	(56,071)		(63,356)
Interest expense — amortization of deferred financing costs	(1,288)	(1,197)	(2,367)		(2,386)
Interest expense — financing obligation	(324)	(316)	(610)		(588)
Equity in loss of Real Estate Ventures	(873)	(489)	(742)		(247)
Net gain on disposition of real estate	1,571	0	10,590		0
Gain (loss) on sale of undepreciated real estate	0	(3)	0		1,184
Net gain from remeasurement of investments in real estate ventures	758	458	758		458
Loss on real estate venture transactions	0	(282)	0		(417)
Provision for impairment on assets held for sale/sold	(782)	0	(2,508)		0
Income (Loss) from continuing operations	3,058	1,245	11,652		(992)
Discontinued operations:
Income from discontinued operations	0	26	0		18
Net gain on disposition of discontinued operations	0	903	0		903
Total discontinued operations	0	929	0		921
Net income (loss)	3,058	2,174	11,652		(71)
Net loss attributable to non-controlling interest — partners' share of consolidated real estate ventures	5	24	5		12
Net income (loss) attributable to Brandywine Realty Trust	3,063	2,198	11,657		(59)
Distribution to Preferred Shares	(1,725)	(1,725)	(3,450)		(3,450)
Nonforfeitable dividends allocated to unvested restricted shareholders	(76)	(83)	(177)		(186)
Net income (loss) attributable to Common Shareholders of Brandywine Realty Trust	$ 1,262	$ 390	$ 8,030		$ (3,695)
Basic income (loss) per Common Share:
Continuing operations (USD per share)	$ 0.01	$ 0	$ 0.04		$ (0.03)
Discontinued operations (USD per share)	0	0	0		0.01
Net income (loss) attributable to common shareholders, Basic (USD per share)	0.01	0	0.04		(0.02)
Diluted income (loss) per Common Share:
Continuing operations (USD per share)	0.01	0	0.04		(0.03)
Discontinued operations (USD per share)	0	0	0		0.01
Net income (loss) attributable to common shareholders, Diluted (USD per share)	$ 0.01	$ 0	$ 0.04		$ (0.02)
Basic weighted average shares outstanding (in shares)	181,395,386	158,801,087	181,247,530		158,680,095
Diluted weighted average shares outstanding (in shares)	182,073,989	158,801,087	182,134,367		158,680,095
Net income attributable to Brandywine Realty Trust
Total continuing operations	$ 3,063	$ 1,269	$ 11,657		$ (980)
Total discontinued operations	0	929	0		921
Net income (loss)	3,058	2,174	11,652		(71)
Net income (loss)	$ 3,063	$ 2,198	$ 11,657		$ (59)
[1]	Gain/(Loss) on Sale is net of closing and other transaction related costs.

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income Statement - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Net income (loss)		$ 3,058	$ 2,174	$ 11,652	$ (71)
Other comprehensive income (loss):
Unrealized gain (loss) on derivative financial instruments		1,494	(2,285)	(1,169)	(3,265)
Reclassification of realized (gains)/losses on derivative financial instruments to operations, net	[1]	58	60	116	120
Total other comprehensive income (loss)		1,552	(2,225)	(1,053)	(3,145)
Comprehensive income (loss)		4,610	(51)	10,599	(3,216)
Comprehensive (income) loss attributable to non-controlling interest		(15)	44	(51)	86
Comprehensive income (loss) attributable to Brandywine Realty Trust		4,595	(7)	10,548	(3,130)
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Net income (loss)		3,058	2,174	11,652	(71)
Other comprehensive income (loss):
Unrealized gain (loss) on derivative financial instruments		1,494	(2,285)	(1,169)	(3,265)
Reclassification of realized (gains)/losses on derivative financial instruments to operations, net	[1]	58	60	116	120
Total other comprehensive income (loss)		1,552	(2,225)	(1,053)	(3,145)
Comprehensive income (loss)		$ 4,610	$ (51)	$ 10,599	$ (3,216)
[1]	Amounts reclassified from comprehensive income to interest expense within the Consolidated Statements of Operations.The accompanying notes are an integral part of these consolidated financial statements.

Consolidated Statements of Bene

Consolidated Statements of Beneficiaries' Equity - USD ($) $ in Thousands	Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Deferred Compensation, Share-based Payments [Member]	Common Stock In Grantor Trust [Member]	Cumulative Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Cumulative Distributions [Member]	Noncontrolling Interest [Member]
Beginning Balance, Shares at Dec. 31, 2013		4,000,000	156,731,993		312,280
Beginning Balance at Dec. 31, 2013	$ 1,921,435	$ 40	$ 1,566	$ 2,971,596	$ 5,407	$ (5,407)	$ 522,528	$ (2,995)	$ (1,592,515)	$ 21,215
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(71)						(20)			(51)
Other comprehensive loss	(3,145)							(3,110)		(35)
Equity Issuance Costs	(60)			(60)
Share-based compensation activity, Shares			279,913
Share-based compensation activity	3,629		$ 5	3,612			12
Share Issuance from/to Deferred Compensation Plan, Shares			79,077		74,808
Share issuance from/to Deferred Compensation Plan	(90)			(90)	$ 896	(896)
Adjustments to Non-controlling Interest	0			12						(12)
Preferred Share distributions	(3,450)								(3,450)
Distributions declared	(47,806)								(47,276)	(530)
Ending Balance, Shares at Jun. 30, 2014		4,000,000	157,090,983		387,088
Ending Balance at Jun. 30, 2014	1,870,442	$ 40	$ 1,571	2,975,070	$ 6,303	(6,303)	522,520	(6,105)	(1,643,241)	20,587
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	3,314,693	$ 6,219	(6,219)	529,487	(4,607)	(1,700,579)	18,499
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	11,652						11,592			60
Other comprehensive loss	(1,053)							(1,044)		(9)
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	(48)			(48)
Share-based compensation activity, Shares			509,675		280,011
Share-based compensation activity	2,955		$ 6	2,949
Share Issuance from/to Deferred Compensation Plan, Shares			86,839		83,498
Share issuance from/to Deferred Compensation Plan	0				$ 5,777	(5,777)
Adjustments to Non-controlling Interest	0			32						(32)
Preferred Share distributions	(3,450)								(3,450)
Distributions declared	(54,726)								(54,265)	(461)
Ending Balance, Shares at Jun. 30, 2015		4,000,000	179,898,121		748,045
Ending Balance at Jun. 30, 2015	$ 2,115,806	$ 40	$ 1,799	$ 3,317,751	$ 11,996	$ (11,996)	$ 541,079	$ (5,651)	$ (1,758,294)	$ 19,082

Consolidated Statements of Ben7

Consolidated Statements of Beneficiaries' Equity (Parantheticals) - $ / shares	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cumulative Distributions [Member]
Dividends declared (USD per share)	$ 0.30	$ 0.30
Noncontrolling Interest [Member]
Dividends declared (USD per share)	$ 0.30	$ 0.30

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Net income (loss)	$ 11,652	$ (71)
Adjustments to reconcile net income (loss) to net cash from operating activities:
Depreciation and amortization	102,041	105,157
Amortization of deferred financing costs	2,367	2,386
Amortization of debt discount/(premium), net	(318)	(324)
Amortization of stock compensation costs	3,568	3,752
Shares used for employee taxes upon vesting of share awards	(2,056)	(1,266)
Straight-line rent income	(11,483)	(7,183)
Amortization of acquired above (below) market leases, net	(2,633)	(3,698)
Straight-line ground rent expense	44	44
Provision for doubtful accounts	704	1,272
Loss on real estate venture transactions	0	417
Net gain on sale of interests in real estate	(10,590)	(2,087)
Net gain from remeasurement of investment in a real estate venture	(758)	(458)
Provision for impairment on assets held for sale/sold	2,508	0
Real Estate Venture (income) loss and cash distributions	1,197	558
Deferred financing obligation	(612)	(590)
Changes in assets and liabilities:
Accounts receivable	(390)	(6,328)
Other assets	(1,313)	1,462
Accounts payable and accrued expenses	(2,261)	(2,815)
Deferred income, gains and rent	(3,991)	(116)
Other liabilities	941	129
Net cash from operating activities	88,617	90,241
Cash flows from investing activities:
Acquisition of properties	(120,379)	(12,405)
Acquisition of property - 1031 exchange funds applied	(62,812)	0
Sale of properties	80,268	40,149
Sale of property - 1031 exchange funds held in escrow	62,800	0
Proceeds from repayment of mortgage notes receivable	88,000	2,800
Capital expenditures for tenant improvements	(39,693)	(58,035)
Capital expenditures for redevelopments	(21,844)	(4,773)
Capital expenditures for developments	(83,628)	(19,270)
Advances for purchase of tenant assets, net of repayments	(3,003)	16
Investment in unconsolidated Real Estate Ventures	(49,139)	(3,095)
Deposits for real estate	(2,935)	0
Escrowed cash	2,113	1,758
Cash distributions from unconsolidated Real Estate Ventures in excess of cumulative equity income	5,774	5,329
Leasing costs	(10,892)	(13,862)
Net cash used in investing activities	(155,370)	(61,388)
Cash flows from financing activities:
Repayments of mortgage notes payable	(7,046)	(6,647)
Debt financing costs paid	(2,941)	(35)
Proceeds from the exercise of stock options	127	709
Partner contribution to consolidated real estate venture	1,025	0
Distributions paid to shareholders	(57,471)	(50,710)
Distributions to noncontrolling interest	(461)	(541)
Net cash used in financing activities	(66,767)	(57,224)
Decrease in cash and cash equivalents	(133,520)	(28,371)
Cash and cash equivalents at beginning of period	257,502	263,207
Cash and cash equivalents at end of period	123,982	234,836
Supplemental disclosure:
Cash paid for interest, net of capitalized interest during the six months ended June 30, 2015 and 2014 of $5,623 and $2,726, respectively	63,239	66,869
Supplemental disclosure of non-cash activity:
Change in investments in joint venture related to non-cash disposition of property	0	(5,897)
Change in real estate investments related to non-cash property acquisition	(67,261)	0
Change in investments in joint venture related to non-cash property acquisition	67,261	0
Change in receivable from settlement of acquisitions	0	619
Change in other liabilities from contingent consideration related to a property acquisition	1,585	0
Change in operating real estate from contingent consideration related to a property acquisition	(1,585)	0
Change in capital expenditures financed through accounts payable at period end	(4,142)	(639)
Change in capital expenditures financed through retention payable at period end	5,415	1,188
Change in unfunded tenant allowance	0	(193)
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Net income (loss)	11,652	(71)
Adjustments to reconcile net income (loss) to net cash from operating activities:
Depreciation and amortization	102,041	105,157
Amortization of deferred financing costs	2,367	2,386
Amortization of debt discount/(premium), net	(318)	(324)
Amortization of stock compensation costs	3,568	3,752
Shares used for employee taxes upon vesting of share awards	(2,056)	(1,266)
Straight-line rent income	(11,483)	(7,183)
Amortization of acquired above (below) market leases, net	(2,633)	(3,698)
Straight-line ground rent expense	44	44
Provision for doubtful accounts	704	1,272
Loss on real estate venture transactions	0	417
Net gain on sale of interests in real estate	$ (10,590)	$ (2,087)
Loss on real estate venture formation
Net gain from remeasurement of investment in a real estate venture	$ (758)	$ (458)
Provision for impairment on assets held for sale/sold	2,508	0
Real Estate Venture (income) loss and cash distributions	1,197	558
Deferred financing obligation	(612)	(590)
Changes in assets and liabilities:
Accounts receivable	(390)	(6,328)
Other assets	(1,313)	1,462
Accounts payable and accrued expenses	(2,261)	(2,815)
Deferred income, gains and rent	(3,991)	(116)
Other liabilities	941	129
Net cash from operating activities	88,617	90,241
Cash flows from investing activities:
Acquisition of properties	(120,379)	(12,405)
Acquisition of property - 1031 exchange funds applied	(62,812)	0
Sale of properties	80,268	40,149
Sale of property - 1031 exchange funds held in escrow	62,800	0
Proceeds from repayment of mortgage notes receivable	88,000	2,800
Capital expenditures for tenant improvements	(39,693)	(58,035)
Capital expenditures for redevelopments	(21,844)	(4,773)
Capital expenditures for developments	(83,628)	(19,270)
Advances for purchase of tenant assets, net of repayments	(3,003)	16
Investment in unconsolidated Real Estate Ventures	(49,139)	(3,095)
Deposits for real estate	(2,935)
Escrowed cash	2,113	1,758
Cash distributions from unconsolidated Real Estate Ventures in excess of cumulative equity income	5,774	5,329
Leasing costs	(10,892)	(13,862)
Net cash used in investing activities	(155,370)	(61,388)
Cash flows from financing activities:
Repayments of mortgage notes payable	(7,046)	(6,647)
Debt financing costs paid	(2,941)	(35)
Proceeds from the exercise of stock options	127	709
Partner contribution to consolidated real estate venture	1,025	0
Distributions paid to shareholders	(57,932)	(51,251)
Net cash used in financing activities	(66,767)	(57,224)
Decrease in cash and cash equivalents	(133,520)	(28,371)
Cash and cash equivalents at beginning of period	257,502	263,207
Cash and cash equivalents at end of period	123,982	234,836
Supplemental disclosure:
Cash paid for interest, net of capitalized interest during the six months ended June 30, 2015 and 2014 of $5,623 and $2,726, respectively	63,239	66,869
Supplemental disclosure of non-cash activity:
Change in investments in joint venture related to non-cash disposition of property	0	(5,897)
Change in real estate investments related to non-cash property acquisition	(67,261)	0
Change in investments in joint venture related to non-cash property acquisition	67,261	0
Change in receivable from settlement of acquisitions	0	619
Change in other liabilities from contingent consideration related to a property acquisition	1,585	0
Change in operating real estate from contingent consideration related to a property acquisition	(1,585)	0
Change in capital expenditures financed through accounts payable at period end	(4,142)	(639)
Change in capital expenditures financed through retention payable at period end	5,415	1,188
Change in unfunded tenant allowance	$ 0	$ (193)

Consolidated Statement of Cash

Consolidated Statement of Cash Flows (Parentheticals) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Provision for impairment on assets held for sale/sold	$ (2,508)	$ 0
Supplemental Cash Flow Information [Abstract]
Cash paid for interest, net of capitalized interest during the six months ended June 30, 2015 and 2014 of $5,623 and $2,726, respectively	5,623	2,726
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Provision for impairment on assets held for sale/sold	(2,508)	0
Supplemental Cash Flow Information [Abstract]
Cash paid for interest, net of capitalized interest during the six months ended June 30, 2015 and 2014 of $5,623 and $2,726, respectively	$ 5,623	$ 2,726

Organization of the Parent Comp

Organization of the Parent Company and The Operating Partnership	6 Months Ended
	Jun. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
ORGANIZATION OF THE PARENT COMPANY AND THE OPERATING PARTNERSHIP	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, industrial, 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 June 30, 2015 , 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 June 30, 2015 , the Company owned 199 properties, consisting of 167 office properties, 20 industrial facilities, five mixed-use properties, one retail property ( 193 core properties), four development properties, one redevelopment property and one re-entitlement property (collectively, the “Properties”) containing an aggregate of approximately 25.2 million net rentable square feet. In addition, as of June 30, 2015 , the Company owned economic interests in 18 unconsolidated real estate ventures that own properties containing an aggregate of approximately 5.6 million net rentable square feet (collectively, the “Real Estate Ventures”). As of June 30, 2015 , the Company also owned 430 acres of undeveloped land, and held options to purchase approximately 63 additional acres of undeveloped land. As of June 30, 2015 , the total potential development that these land parcels could support, under current zoning, entitlements or combination thereof, amounted to an estimated 7.2 million square feet of development, inclusive of options to purchase approximately 63 additional acres of undeveloped land. 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, Concord and Carlsbad, California. The Company conducts its third-party real estate management services business primarily through wholly-owned management company subsidiaries. As of June 30, 2015 , the management company subsidiaries were managing properties containing an aggregate of approximately 33.0 million net rentable square feet, of which approximately 25.2 million net rentable square feet related to Properties owned by the Company and approximately 7.8 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	6 Months Ended
	Jun. 30, 2015
Accounting Policies [Abstract]
BASIS OF PRESENTATION	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 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 June 30, 2015 , the results of its operations for the three and six-month periods ended June 30, 2015 and 2014 and its cash flows for the six-month periods ended June 30, 2015 and 2014 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 2014 Annual Report on Form 10-K filed with the SEC on February 19, 2015 . The Company's Annual Report on Form 10-K for the year ended December 31, 2014 contains a discussion of our significant accounting policies under Note 2, "Summary of Significant Accounting Policies". There have been no significant changes in our significant accounting policies since December 31, 2014 . Management discusses our significant accounting policies and management’s judgments and estimates with the Company's Audit Committee. Recent Accounting Pronouncements On July 9, 2015, the Financial Accounting Standards Board ("FASB") elected to defer the effective date of the revenue recognition standard issued in May 2014 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 public entities are therefore required to apply the new revenue guidance beginning in their 2018 interim and annual financial statements. The Company has not yet determined the impact, if any, that the adoption of this guidance will have on its consolidated financial statements. See Note 2, " Summary of Significant Accounting Policies ," included in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2014 for the Company's initial disclosure of this standard. In April 2015, the FASB issued guidance simplifying the presentation of debt issuance costs. The guidance requires that all costs incurred to issue debt be presented in the balance sheet as a direct deduction from the carrying value of the debt. The amortization of these costs will remain under the interest method and will continue to be reported as interest expense. The guidance is effective for public companies for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. Early adoption is permitted for financial statements that have not been previously issued. The new guidance will be applied on a retrospective basis. The Company has not yet determined the impact, if any, that the adoption of this guidance will have on its consolidated financial statements. In February 2015, the FASB issued guidance modifying the analysis a reporting entity must perform to determine whether it should consolidate certain types of legal entities. The guidance does not change the general order in which the consolidation models are applied. A reporting entity that holds an economic interest in, or is otherwise involved with, another legal entity first determines if the variable interest entity model applies, and if so, whether it holds a controlling financial interest under that model. If the entity being evaluated for consolidation is not a variable interest entity, then the voting model should be applied to determine whether the entity should be consolidated by the reporting entity. Key changes to the guidance include, though are not limited to; (i.) limiting the extent to which related party interests are included in the other economic interest criterion to the decision maker’s effective interest holding, (ii.) requiring limited partners of a limited partnership, or the members of a limited liability company that is similar to a limited partnership, to have, at minimum, kick-out or participating rights to demonstrate that the partnership is a voting entity, (iii.) changing the evaluation of whether the equity holders at risk lack decision making rights when decision making is outsourced and (iv.) changing how the economics test is performed. The guidance does not amend the existing disclosure requirements for variable interest entities or voting model entities. The guidance is effective for public companies for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. Early adoption is permitted. The Company has not yet determined the impact, if any, that the adoption of this guidance will have on its consolidated financial statements.

Real Estate Investments

Real Estate Investments	6 Months Ended
	Jun. 30, 2015
Real Estate [Abstract]
REAL ESTATE INVESTMENTS	REAL ESTATE INVESTMENTS As of June 30, 2015 and December 31, 2014 , the gross carrying value of the Company’s Properties was as follows (in thousands): June 30, December 31, Land $ 677,644 $ 669,635 Building and improvements 3,476,667 3,409,303 Tenant improvements 546,528 524,754 4,700,839 4,603,692 Assets held for sale - real estate investments (a) — 27,436 Total $ 4,700,839 $ 4,631,128 (a) Real estate investments related to assets held for sale above represents gross real estate assets and does not include accumulated depreciation or other assets on the balance sheets of the properties held for sale. Acquisitions On June 22, 2015 , through a series of transactions with International Business Machines ("IBM"), the Company acquired the remaining 50.0% interest in Broadmoor Austin Associates, consisting of seven office buildings and the 66.0 acre underlying land parcel located in Austin, Texas , for an aggregate purchase price of $211.4 million . The office buildings contain 1,112,236 net rentable square feet of office space and were 100.0% occupied as of June 30, 2015. The Company funded the cost of the acquisition with an aggregate cash payment of $143.8 million , consisting of $81.0 million from available corporate funds and $62.8 million previously held in escrow related to a Section 1031 like-kind exchange. Part of the cash payment was used at closing to repay, at no repayment penalty, the remaining $51.2 million of secured debt. The Company incurred $0.2 million of acquisition related costs that are classified within general and administrative expenses. The Company previously accounted for its 50.0% non-controlling interest in Broadmoor Austin Associates under the equity method of accounting. As a result of acquiring IBM's remaining 50.0% common interest in Broadmoor Austin Associates, the Company obtained control of Broadmoor Austin Associates and the Company's existing investment balance was remeasured based on fair value of the underlying properties acquired and the existing distribution provisions under the relevant partnership agreement. As a result, the Company recorded a $0.8 million gain on remeasurement. The Company has treated its acquisition of the 50.0% ownership interest in Broadmoor Austin Associates as a business combination and allocated the purchase price to the tangible and intangible assets and liabilities. The Company utilized a number of sources in making estimates of fair values for purposes of allocating the purchase price to tangible and intangibles assets acquired and intangible liabilities assumed. As of June 30, 2015, the purchase price is preliminary and subject to change. The purchase price has been allocated as follows: June 22, 2015 Building, land and improvements $ 161,252 Land inventory 8,064 Intangible assets acquired (a) 50,637 Below market lease liabilities assumed (b) (8,600 ) $ 211,353 Return of existing equity method investment (67,261 ) Net working capital assumed (271 ) Total cash payment at settlement $ 143,821 (a) Weighted average amortization period of 4.0 years . (b) Weighted average amortization period of 1.5 years . The unaudited pro forma information below summarizes the Company’s combined results of operations for the three and six-month periods ended June 30, 2015 and 2014 , respectively, as though the acquisition of Broadmoor Austin Associates was completed on January 1, 2014. The supplemental pro forma operating data is not necessarily indicative of what the actual results of operations would have been assuming the transaction had been completed as set forth above, nor do they purport to represent the Company’s results of operations for future periods (in thousands except for per share amounts). Three-month periods ended Six-month periods ended June 30, June 30, 2015 2014 2015 2014 Pro forma revenue $ 148,677 $ 153,893 $ 302,323 $ 309,771 Pro forma income from continuing operations 5,210 3,767 16,277 4,391 Pro forma net income available to common shareholders 3,407 2,907 12,590 1,727 Earnings (loss) per common share from continuing operations: Basic -- as reported $ 0.01 $ 0.01 $ 0.06 $ (0.01 ) Basic -- as pro forma $ 0.03 $ 0.02 $ 0.09 $ 0.03 Diluted -- as reported $ 0.01 $ 0.01 $ 0.06 $ (0.01 ) Diluted -- as pro forma $ 0.03 $ 0.02 $ 0.09 $ 0.03 Earnings (loss) per common share: Basic -- as reported $ — $ — $ 0.04 $ (0.02 ) Basic -- as pro forma $ 0.02 $ 0.02 $ 0.07 $ 0.01 Diluted -- as reported $ — $ — $ 0.04 $ (0.02 ) Diluted -- as pro forma $ 0.02 $ 0.02 $ 0.07 $ 0.01 Included in the pro forma income for the three-month periods ended June 30, 2015 and 2014 are total revenues of $3.2 million and $3.4 million , respectively, and net income attributable to common shareholders of $2.7 million and $2.5 million , respectively. Included in the pro forma income for the six-month periods ended June 30, 2015 and 2014 are total revenues of $6.5 million and $7.2 million , respectively, and net income attributable to common shareholders of $5.1 million and $5.4 million , respectively. For both the three and six-month periods ended June 30, 2015 and 2014, $0.2 million of acquisition related costs is included in 2014 as if the transaction occurred January 1, 2014. On April 9, 2015 , the Company acquired the leasehold interest in a 0.4 acre land parcel at 405 Colorado Street located in the central business district of Austin, Texas for $2.6 million . The property is currently being operated as a surface parking lot with the intent to develop the site into an office property. The Company accounted for this transaction as an asset acquisition. On April 6, 2015 , the Company acquired a 0.8 acre parcel of land, located at 25 M Street Southeast, Washington, D.C. for $20.3 million . The Company funded the cost of this acquisition with available corporate funds. The Company capitalized $0.3 million of acquisition related costs and these costs are included as part of land inventory on the Company's consolidated balance sheet. On May 12, 2015 , the Company subsequently contributed the land parcel into a newly formed real estate venture known as 25 M Street Holdings, LLC (“25 M Street”), a joint venture between the Company and Jaco 25 M Investors, LLC (“Akridge”), an unaffiliated third party, with the intent to construct a 271,000 square foot Class A office property. The Company holds a 95.0% ownership interest in 25 M Street and Akridge contributed $1.0 million in cash for its 5.0% ownership interest in 25 M Street. The $1.0 million contribution from Akridge was distributed to the Company. The partners of the venture have not determined the timing and cost of construction for the project as of June 30, 2015 . On April 2, 2015 , the Company acquired, from an unaffiliated third party, a property comprised of a parking garage with 330 parking spaces and mixed-use space totaling 14,404 rentable square feet located at 618 Market Street in Philadelphia, Pennsylvania for an aggregate fair value of $19.4 million . The property is currently fully operational. The purchase price includes contingent consideration, recorded at fair value and payable to the seller upon commencement of development, totaling $1.6 million and cash of $17.8 million . The Company has treated the acquisition of 618 Market Street as a business combination and allocated the purchase price to the tangible and intangible assets. The Company utilized a number of sources in making estimates of fair values for purposes of allocating the purchase price to tangible and intangibles assets acquired. The Company allocated $19.2 million to building, land and improvements and $0.2 million to intangible assets. The fair value of contingent consideration was determined using a probability weighted discounted cash flow model. The significant input to the model was the Company's weighted average cost of capital. As this input is unobservable, the Company determined the input used to value this liability falls within Level 3 for fair value reporting. Dispositions The Company sold the following properties during the six-month period ended June 30, 2015 (dollars in millions). Disposition Date Property Name Property Location Property Type Number of Properties Sale Price Gain/(Loss) On Sale (a) Rentable Square Feet June 10, 2015 100 Gateway Centre Parkway Richmond, VA Office 1 $ 4.1 $ — (b) 74,991 April 24, 2015 Delaware Corporate Center I & II/Christian Corporate Center Wilmington, DE/Newark, DE Office 5 50.1 1.6 485,182 April 9, 2015 Lake Merritt Tower Oakland, CA Office 1 65.0 — (c) 204,336 January 8, 2015 Atrium I/Libertyview Mt. Laurel, NJ/Cherry Hill, NJ Office 2 28.3 9.0 221,405 Total Dispositions 9 $ 147.5 $ 10.6 985,914 (a) Gain/(Loss) on Sale is net of closing and other transaction related costs. (b) The Company recorded an impairment loss of $0.8 million for 100 Gateway Centre Parkway during the second quarter of 2015. As such, there was no gain/(loss) at disposition for this property. (c) The Company recorded an impairment loss of $1.7 million for Lake Merritt Tower at March 31, 2015. As such, there was no gain/(loss) at disposition for this property. Sales proceeds were deposited in escrow under Section 1031 of the Internal Revenue Code and applied to purchase the Broadmoor Austin portfolio. Refer to Broadmoor Austin Associates acquisition summary, above, for further details. The sales of properties 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. As a result of selling $147.5 million of real estate as of June 30, 2015, the Company increased its current year business plan disposition target from $180.0 million to $300.0 million . The Company is exploring the disposition of several properties, individually or as a portfolio, during the remainder of 2015 in alignment with its business plan. As of June 30, 2015, the Company has not entered into agreements to sell additional properties nor can we provide assurance as to any/or which properties for which a sale might be realized. Accordingly, the Company has prepared undiscounted cash flow analyses for the relevant properties based upon several reasonably possible scenarios and the estimated likelihood of each scenario occurring. These estimated probability weighted undiscounted cash flows exceed the carrying values for the properties, and, therefore, no impairment charge has been recorded at June 30, 2015. Significant estimates were made in the determination of the future undiscounted cash flows, including expected future rents and operating expenses, holding periods, cash proceeds at the end of the estimated holding period and the probability of the various reasonably possible scenarios. Changes to estimates made by management for certain properties, including those related to holding periods, may result in the recognition of impairment losses, and such amounts could be material to the Company’s results of operations. Impairments Measured at Fair Value on a Non-recurring Basis During the six-month period ended June 30, 2015 , the Company recognized $2.5 million in impairment charges on properties sold to reduce the carrying value of the properties to their sales price in connection with the anticipated disposition. The fair value measurement related to these impairment charges was determined by the respective sales agreement. As the sales price is unobservable, the Company determined that the significant input used to value these real estate investments falls within Level 3 for fair value reporting.

Investment in Unconsolidated Ve

Investment in Unconsolidated Ventures	6 Months Ended
	Jun. 30, 2015
Equity Method Investments and Joint Ventures [Abstract]
INVESTMENT IN UNCONSOLIDATED VENTURES	INVESTMENT IN UNCONSOLIDATED VENTURES As of June 30, 2015 , the Company held ownership interests in 18 unconsolidated Real Estate Ventures for an aggregate investment balance of $199.8 million , of which $201.0 million is included in assets and $1.2 million is included in other liabilities relating to the negative investment balance of one real estate venture. The Company formed or acquired interests in these 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 June 30, 2015 , ten of the real estate ventures owned 58 office buildings that contain an aggregate of approximately 5.6 million net rentable square feet; four real estate ventures owned 5.2 acres of undeveloped parcels of land; two real estate ventures owned 21.8 acres of land under development; one real estate venture owned a residential tower that contains 345 apartment units and one real estate venture owned a hotel property that contains 137 rooms in Conshohocken, PA. The Company accounts for its unconsolidated interests in its 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 amounts reflected in the following tables (except for the Company’s share of equity and income) are based on the historical 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 June 30, 2015 and December 31, 2014 (in thousands): June 30, December 31, Net property $ 1,295,947 $ 1,281,282 Other assets 165,693 195,121 Other liabilities 59,472 68,481 Debt 927,032 965,077 Equity 475,136 442,845 Company’s share of equity (Company’s basis) (a) (b) $ 201,034 $ 225,004 (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 of one real estate venture totaling $1.2 million as of June 30, 2015 and December 31, 2014, respectively, which is included in other liabilities. The Company held interests in 18 Real Estate Ventures containing an aggregate of approximately 5.6 million net rentable square feet as of the three and six-month periods ended June 30, 2015 and 17 Real Estate Ventures containing an aggregate of approximately 5.9 million net rentable square feet as of the three and six-month periods ended June 30, 2014 . The following is a summary of results of operations of the Real Estate Ventures in which the Company had interests during these periods (in thousands): Three-month periods ended June 30, Six-month periods ended June 30, 2015 2014 2015 2014 Revenue $ 43,239 $ 35,074 $ 89,348 $ 69,459 Operating expenses (19,132 ) (14,842 ) (37,665 ) (28,824 ) Interest expense, net (10,136 ) (8,889 ) (19,982 ) (16,989 ) Depreciation and amortization (17,412 ) (13,273 ) (36,536 ) (26,871 ) Net loss $ (3,441 ) $ (1,930 ) $ (4,835 ) $ (3,225 ) Company’s share of loss (Company’s basis) $ (873 ) $ (489 ) $ (742 ) $ (247 ) JBG - Ventures On May 29, 2015 , the Company and an unaffiliated third party, JBG/DC Manager, LLC ("JBG"), formed 51 N 50 Patterson, Holdings, LLC Venture ("51 N Street") and 1250 First Street Office, LLC Venture ("1250 First Street"), as real estate ventures, with the Company owning a 70.0% interest and JBG owning a 30.0% interest in each of the two ventures. At formation, the Company and JBG made cash contributions of $15.2 million and $6.5 million , respectively, to 51 N Street, which was used to purchase 0.9 acres of undeveloped land. At formation, the Company and JBG made cash capital contributions of $13.2 million and $5.7 million , respectively, to 1250 First Street, which was used to purchase 0.5 acres of undeveloped land. Based upon the facts and circumstances at formation of each of the two ventures with JBG, the Company determined that each venture is a VIE in accordance with the accounting standard for the consolidation of VIEs. As a result, the Company used the variable interest model under the accounting standard for consolidation in order to determine whether to consolidate the JBG Ventures. JBG is the managing member of the ventures, and pursuant to the operating and related agreements, major decisions require the approval of both members. Based upon each member's shared power over the activities of each of the two ventures, which most significantly impact the economics of the ventures, neither venture is consolidated by the Company. Each venture is accounted for under the equity method of accounting. Broadmoor Austin Associates On June 22, 2015 , the Company became the sole owner of Broadmoor Austin Associates upon the Company's acquisition from an unaffiliated third party of the remaining 50.0% ownership interest in Broadmoor Austin Associates. Broadmoor Austin Associates owns seven office buildings in Austin, Texas . See Note 3, "Real Estate Investments," for further information. 25 M Street (Akridge) On May 12, 2015 , the Company contributed the parcel of land purchased on April 9, 2015 into a newly formed real estate venture known as 25 M Street, a joint venture between the Company and Akridge, an unaffiliated third party. See Note 3, "Real Estate Investments," for further information. Based on the facts and circumstances at formation of 25 M Street, the Company determined that 25 M Street is a variable interest entity (VIE) in accordance with the accounting standard for consolidation of VIEs. Accordingly, the Company used the variable interest model under the accounting standard for consolidation in order to determine whether to consolidate 25 M Street. Under the operating and related agreements the Company has the power to control substantially all of the activities which most significantly impact the economics of 25 M Street, and accordingly, 25 M Street is consolidated within the Company’s financial statements. DRA - PA Venture On December 19, 2007, the Company formed G&I Interchange Office LLC, a real estate venture (the “Interchange Venture”), with an unaffiliated third party, G&I VI Investment Interchange Office LLC (“G&I VI”), an investment vehicle advised by DRA Advisors LLC. The Interchange Venture owns 29 office properties containing an aggregate of 1,611,961 net rentable square feet located in Montgomery, Lehigh and Bucks counties, Pennsylvania. The Company contributed these 29 properties to the Interchange Venture upon the Venture's formation and in exchange for the contribution received a cash distribution from the Venture and a 20.0% ownership interest in the Venture. On February 27, 2015, the Venture entered into a forbearance agreement with an unaffiliated lender that holds a nonrecourse mortgage on the Venture's assets. The mortgage secures a nonrecourse loan with an outstanding balance of $174.2 million . The loan matured on January 1, 2015. The forbearance agreement extended the maturity date of the mortgage loan to July 31, 2015 and contains, at the lender’s option, a 60 -day extension option. The lender has the exclusive right to sell the properties to a third-party purchaser during the forbearance period. The lender will receive the net proceeds from the sale of the properties. If the properties are not sold during the forbearance period, then the lender will foreclose on the assets. The Company has no obligation to fund any amounts to the lender under the loan or mortgage. The Company has not had any investment basis in the Venture since formation of the Venture in 2007. The Company is not obligated to fund any of the losses incurred by the Venture and, as a result, has not recognized losses in excess of its invested capital balance. Austin Venture On January 30, 2015, the Austin Venture closed on a mortgage loan with a non-affiliated institutional lender, and used the proceeds of the loan to repay in full an $88.0 million short-term secured loan made by the Company to fund costs of the Austin Venture's acquisition of River Place. For further information regarding this acquisition, see Note 4, " Investment In Unconsolidated Ventures ," included in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2014. Guarantees As of June 30, 2015 , the Company had provided guarantees on behalf of certain real estate ventures, consisting of (i) a $24.7 million payment guarantee on the construction loan for the project being undertaken by evo at Cira; (ii) a $3.2 million payment guarantee on the construction loan for the development project being undertaken by TB-BDN Plymouth Apartments; 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 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, " Investments in Unconsolidated Ventures, " in notes to the audited financial statements included in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2014 .

Intangible Assets and Liabiliti

Intangible Assets and Liabilities	6 Months Ended
	Jun. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
INTANGIBLE ASSETS AND LIABILITIES	INTANGIBLE ASSETS AND LIABILITIES As of June 30, 2015 and December 31, 2014 , the Company’s intangible assets/liabilities were comprised of the following (in thousands): June 30, 2015 Total Cost Accumulated Amortization Intangible assets/liabilities, net Intangible assets, net: In-place lease value $ 176,041 $ (48,435 ) $ 127,606 Tenant relationship value 30,203 (24,339 ) 5,864 Above market leases acquired 5,510 (1,690 ) 3,820 Total intangible assets, net $ 211,754 $ (74,464 ) $ 137,290 Acquired lease intangibles, net: Below market leases acquired $ 60,963 $ (29,398 ) $ 31,565 December 31, 2014 Total Cost Accumulated Amortization Intangible assets/liabilities, net Intangible assets, net: In-place lease value $ 129,411 $ (42,068 ) $ 87,343 Tenant relationship value 34,172 (26,344 ) 7,828 Above market leases acquired 5,641 (1,409 ) 4,232 Total intangible assets, net $ 169,224 $ (69,821 ) $ 99,403 Acquired lease intangibles, net: Below market leases acquired $ 53,049 $ (27,039 ) $ 26,010 As of June 30, 2015 , the Company’s annual amortization for its intangible assets/liabilities were as follows (in thousands, and assuming no prospective early lease terminations): Assets Liabilities 2015 (six months remaining) $ 25,005 $ 5,693 2016 36,642 7,595 2017 19,815 3,461 2018 12,585 2,217 2019 11,286 1,885 Thereafter 31,957 10,714 Total $ 137,290 $ 31,565

Debt Obligations

Debt Obligations	6 Months Ended
	Jun. 30, 2015
Debt Disclosure [Abstract]
DEBT OBLIGATIONS	DEBT OBLIGATIONS During the three and six-month periods ended June 30, 2015 , the Company repaid $3.6 million and $7.2 million , respectively, of principal on its mortgage debt in the ordinary course of business. There were no changes to our outstanding unsecured debt. On May 15, 2015 , the Company closed on a new four -year unsecured revolving credit facility (the "New Credit Facility") that provides for borrowings of up to $600.0 million . The Company expects to use advances under the New Credit Facility for general business purposes, including to fund costs of acquisitions, developments and redevelopments of properties and to repay from time to time other debt. On terms and conditions specified in the credit agreement, the Company may enter into unsecured term loans and/or increase the initial amount of the credit facility by up to, in the aggregate for all such term loans and increases, an additional $400.0 million . The New Credit Facility includes a $65.0 million sub-limit for the issuance of letters of credit and a $60.0 million sub-limit for swing-loans. The New Credit Facility has a scheduled maturity date of May 15, 2019, and is subject to two six-month extensions on terms and conditions specified in the credit agreement. At the Company's option, loans outstanding under the New Credit Facility will bear interest at a rate per annum equal to (1) LIBOR plus between 0.875% and 1.55% based on the Company's credit rating or (2) a base rate equal to the greatest of (a) the Administrative Agent's prime rate, (b) the Federal Funds rate plus 0.5% or (c) LIBOR for a one month period plus 1.00% , in each case, plus a margin ranging from 0.0% to 0.55% based on the Company's credit rating. The New Credit Facility also contains a competitive bid option that allows banks that are part of the lender consortium to bid to make loan advances to the Company at a reduced interest rate. In addition, the Company is also obligated to pay (1) in quarterly installments a facility fee on the total commitment at a rate per annum ranging from 0.125% to 0.30% based on the Company's credit rating and (2) an annual fee on the undrawn amount of each letter or credit equal to the LIBOR Margin. Based on the Company's current credit rating, the LIBOR margin is 1.20% and the facility fee is 0.25% . The Company had no borrowings under the New Credit Facility as of June 30, 2015 . The terms of the New Credit Facility require that the Company maintain customary financial and other covenants, including: (i) a fixed charge coverage ratio greater than or equal to 1.5 to 1.00; (ii) a minimum net worth; (iii) a leverage ratio less than or equal to 0.60 to 1.00, subject to specified exceptions; (iv) a ratio of unsecured indebtedness to unencumbered asset value less than or equal to 0.60 to 1.00, subject to specified exceptions; (v) ratio of secured indebtedness to total asset value less than or equal to 0.40 to 1.00; and (vi) a ratio of unencumbered cash flow to interest expense on unsecured debt greater than 1.75 to 1.00. In addition, the New Credit Facility restricts payments of dividends and distributions on shares in excess of 95% of the Company's funds from operations (FFO) except to the extent necessary to enable the Company to continue to qualify as a REIT for Federal income tax purposes. At June 30, 2015, the Company was in compliance with all covenants in the New Credit Facility. Concurrently with its entry into the New Credit Facility, the Company terminated its then existing unsecured revolving credit facility, which had a scheduled maturity date of February 1, 2016. A copy of the New Credit Facility is an exhibit to a Current Report on Form 8-K filed on May 21, 2015. A copy of the prior credit facility is an exhibit to the Annual Report on Form 10-K for the year ended December 31, 2011. On June 1, 2015, the Company amended its Term Loan C Agreement dated December 15, 2011 to align the above aforementioned financial and operating covenants and restrictions of the New Credit Facility with that of Term Loan C. The amendment is filed as part of this Quarterly Report on Form 10-Q. See Item 6.," Exhibits. "

Fair Value of Financial Instrum

Fair Value of Financial Instruments	6 Months Ended
	Jun. 30, 2015
Fair Value Disclosures [Abstract]
FAIR VALUE OF FINANICAL INSTRUMENTS	FAIR VALUE OF FINANCIAL INSTRUMENTS The Company determined the fair values disclosed below using available market information and discounted cash flow analyses as of June 30, 2015 and December 31, 2014 , 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 June 30, 2015 and December 31, 2014 approximate the fair values for cash and cash equivalents, accounts receivable, other assets, 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): June 30, 2015 December 31, 2014 Carrying Amount Fair Value Carrying Amount Fair Value Unsecured notes payable $ 1,518,657 $ 1,564,314 $ 1,518,108 $ 1,593,212 Variable rate debt $ 278,610 $ 257,443 $ 278,610 $ 257,188 Mortgage notes payable $ 646,512 $ 679,363 $ 654,590 $ 707,241 Mortgage note receivable (a) $ — $ — $ 88,000 $ 87,692 (a) On January 30, 2015 the mortgage note was repaid. For further information regarding the mortgage note, see Note 2, " Summary of Significant Accounting Policies ," included in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2014. The fair value of the Company's unsecured notes payable are categorized as Level 2 (as provided by the accounting standard for Fair Value Measurements and Disclosures). This is because the Company valued these instruments using quoted market prices as of June 30, 2015 and December 31, 2014 . For the fair value of the Company's variable rate debt, the Company uses a discount rate based on the indicative new issue pricing provided by lenders. The fair value of the Company's mortgage notes payable, variable rate debt and mortgage note receivable are all categorized at a Level 3 basis (as provided by the accounting standard for Fair Value Measurements and Disclosures). 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. The fair value of the mortgage note receivable was determined by using the expected cash flows of the notes receivable, and discounting those cash flows using the market rate of interest for mortgage notes with a comparable level of risk. These financial instruments 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 on its knowledge of the mortgage market. The weighted average discount rate for the combined variable rate debt and mortgage loans used to calculate fair value as of June 30, 2015 was 4.5% . 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 June 30, 2015 and December 31, 2014 . 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 June 30, 2015 , 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	6 Months Ended
	Jun. 30, 2015
Noncontrolling Interest [Abstract]
LIMITED PARTNERS' NON-CONTROLLING INTERESTS IN THE PARENT COMPANY	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 June 30, 2015 and December 31, 2014 was $17.1 million and $17.5 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 June 30, 2015 and December 31, 2014 , respectively, was approximately $20.4 million and $24.5 million .

Beneficiaries Equity of the Par

Beneficiaries Equity of the Parent Company	6 Months Ended
	Jun. 30, 2015
Equity [Abstract]
BENEFICIARIES' EQUITY OF THE PARENT COMPANY	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 June 30, 2015 2014 Basic Diluted Basic Diluted Numerator Income from continuing operations $ 3,058 $ 3,058 $ 1,245 $ 1,245 Net (income) loss from continuing operations attributable to non-controlling interests - LP units (7 ) (7 ) 5 5 Net loss attributable to non-controlling interest — partners' share of consolidated real estate ventures 5 5 24 24 Nonforfeitable dividends allocated to unvested restricted shareholders (76 ) (76 ) (83 ) (83 ) Preferred share dividends (1,725 ) (1,725 ) (1,725 ) (1,725 ) Income (loss) from continuing operations available to common shareholders 1,255 1,255 (534 ) (534 ) Income from discontinued operations — — 929 929 Discontinued operations attributable to non-controlling interests — — (10 ) (10 ) Discontinued operations attributable to common shareholders — — 919 919 Net income attributable to common shareholders $ 1,255 $ 1,255 $ 385 $ 385 Denominator Weighted-average shares outstanding 179,860,284 179,860,284 157,037,348 157,037,348 Contingent securities/Share based compensation — 678,603 — — Weighted-average shares outstanding 179,860,284 180,538,887 157,037,348 157,037,348 Earnings per Common Share: Income from continuing operations attributable to common shareholders $ 0.01 $ 0.01 $ — $ — Discontinued operations attributable to common shareholders — — — — Net income attributable to common shareholders $ 0.01 $ 0.01 $ — $ — Six-month periods ended June 30, 2015 2014 Basic Diluted Basic Diluted Numerator Income (loss) from continuing operations $ 11,652 $ 11,652 $ (992 ) $ (992 ) Net (income) loss from continuing operations attributable to non-controlling interests - LP Units (65 ) (65 ) 49 49 Net loss attributable to non-controlling interest — partners' share of consolidated real estate ventures 5 5 12 12 Nonforfeitable dividends allocated to unvested restricted shareholders (177 ) (177 ) (186 ) (186 ) Preferred share dividends (3,450 ) (3,450 ) (3,450 ) (3,450 ) Income (loss) from continuing operations available to common shareholders 7,965 7,965 (4,567 ) (4,567 ) Income from discontinued operations — — 921 921 Discontinued operations attributable to non-controlling interests — — (10 ) (10 ) Discontinued operations attributable to common shareholders — — 911 911 Net income (loss) attributable to common shareholders $ 7,965 $ 7,965 $ (3,656 ) $ (3,656 ) Denominator Weighted-average shares outstanding 179,712,428 179,712,428 156,916,356 156,916,356 Contingent securities/Share based compensation — 886,837 — — Weighted-average shares outstanding 179,712,428 180,599,265 156,916,356 156,916,356 Earnings per Common Share: Income (loss) from continuing operations attributable to common shareholders $ 0.04 $ 0.04 $ (0.03 ) $ (0.03 ) Discontinued operations attributable to common shareholders — — 0.01 0.01 Net income (loss) attributable to common shareholders $ 0.04 $ 0.04 $ (0.02 ) $ (0.02 ) Redeemable common limited partnership units totaling 1,535,102 and 1,763,739 as of June 30, 2015 and 2014 , respectively, were excluded from the diluted earnings per share computations because they are not dilutive. Unvested restricted shares are considered participating securities which require the use of the two-class method for the computation of basic and diluted earnings per share. For the three and six-month periods ended June 30, 2015 and 2014 , 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 May 28, 2015 , the Parent Company declared a distribution of $0.15 per common share, totaling $27.3 million , which was paid on July 20, 2015 to shareholders of record as of July 6, 2015 . In addition, the Parent Company declared distributions on its Series E Preferred Shares to holders of record as of June 30, 2015 . These shares are entitled to a preferential return of 6.90% per annum on the $25.00 per share liquidation preference. Distributions paid on July 15, 2015 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. The Parent Company may sell common shares in amounts and at times to be determined by the Parent Company. Actual sales will depend on a variety of factors to be determined by the Parent Company, including, among others, market conditions, the trading price of the Company’s common shares and determinations by the Parent Company of the appropriate sources of funding. Sales agents engaged by the Parent Company under the Offering Program are entitled to receive, as compensation and in aggregate, up to 2% of the gross sales price per share sold under the Offering Program. From inception of the Offering Program through June 30, 2015 , the Parent Company had not sold any shares under the program, leaving 16,000,000 remaining shares available for sale.

Partners Equity of the Operatin

Partners Equity of the Operating Partnership	6 Months Ended
	Jun. 30, 2015
Equity [Abstract]
PARTNERS' EQUITY OF THE OPERATING PARTNERSHIP	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 June 30, 2015 2014 Basic Diluted Basic Diluted Numerator Income from continuing operations $ 3,058 $ 3,058 $ 1,245 $ 1,245 Nonforfeitable dividends allocated to unvested restricted unitholders (76 ) (76 ) (83 ) (83 ) Preferred unit dividends (1,725 ) (1,725 ) (1,725 ) (1,725 ) Net loss attributable to non-controlling interests 5 5 24 24 Loss from continuing operations available to common unitholders 1,262 1,262 (539 ) (539 ) Discontinued operations attributable to common unitholders — — 929 929 Net income attributable to common unitholders $ 1,262 $ 1,262 $ 390 $ 390 Denominator Weighted-average units outstanding 181,395,386 181,395,386 158,801,087 158,801,087 Contingent securities/Share based compensation — 678,603 — — Total weighted-average units outstanding 181,395,386 182,073,989 158,801,087 158,801,087 Earnings per Common Partnership Unit: Income from continuing operations attributable to common unitholders $ 0.01 $ 0.01 $ — $ — Discontinued operations attributable to common unitholders — — — — Net income attributable to common unitholders $ 0.01 $ 0.01 $ — $ — Six-month periods ended June 30, 2015 2014 Basic Diluted Basic Diluted Numerator Income (loss) from continuing operations $ 11,652 $ 11,652 $ (992 ) $ (992 ) Amount allocable to unvested restricted unitholders (177 ) (177 ) (186 ) (186 ) Preferred unit dividends (3,450 ) (3,450 ) (3,450 ) (3,450 ) Net income attributable to non-controlling interests 5 5 12 12 Income (loss) from continuing operations available to common unitholders 8,030 8,030 (4,616 ) (4,616 ) Discontinued operations attributable to common unitholders — — 921 921 Net income (loss) attributable to common unitholders $ 8,030 $ 8,030 $ (3,695 ) $ (3,695 ) Denominator Weighted-average units outstanding 181,247,530 181,247,530 158,680,095 158,680,095 Contingent securities/Share based compensation — 886,837 — — Total weighted-average units outstanding 181,247,530 182,134,367 158,680,095 158,680,095 Earnings per Common Partnership Unit: Income (loss) from continuing operations attributable to common unitholders $ 0.04 $ 0.04 $ (0.03 ) $ (0.03 ) Discontinued operations attributable to common unitholders — — 0.01 0.01 Net income (loss) attributable to common unitholders $ 0.04 $ 0.04 $ (0.02 ) $ (0.02 ) 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 six-month periods ended June 30, 2015 and 2014 , earnings representing nonforfeitable dividends as noted in the table above were allocated to the unvested restricted units issued 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 May 28, 2015 , the Operating Partnership declared a distribution of $0.15 per common partnership unit, totaling $27.3 million , which was paid on July 20, 2015 to unitholders of record as of July 6, 2015 . On May 28, 2015 , the Operating Partnership declared distributions on its Series E-Linked Preferred Mirror Units to holders of record as of July 6, 2015 . These units are entitled to a preferential return of 6.90% per annum on the $25.00 per unit liquidation preference. Distributions paid on July 15, 2015 to holders of Series E-Linked Preferred Mirror Units totaled $1.7 million .

Segment Information

Segment Information	6 Months Ended
	Jun. 30, 2015
Segment Reporting [Abstract]
SEGMENT INFORMATION	SEGMENT INFORMATION During the quarter ended June 30, 2015 , the Company was managing 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. 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 Northern Virginia Washington, D.C. and southern Maryland. The New Jersey/Delaware segment includes properties in Burlington and Camden counties in New Jersey and in New Castle county in the state of Delaware. The Richmond, Virginia segment includes properties primarily in Albemarle, Chesterfield, Goochland and Henrico counties and one property in Durham, North Carolina. The Austin, Texas segment includes properties in the City of Austin, Texas. The California segment includes properties in Oakland, Concord and Carlsbad. 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. The following tables provide selected asset information and results of operations of the Company's reportable segments (in thousands): Real estate investments, at cost: June 30, 2015 December 31, 2014 Philadelphia CBD $ 1,386,017 $ 1,338,655 Pennsylvania Suburbs 1,180,974 1,178,470 Metropolitan Washington, D.C. 1,211,886 1,183,652 New Jersey/Delaware (a) 330,051 392,581 Richmond, Virginia 310,648 317,076 California 119,360 193,258 Austin, Texas (b) 161,903 — $ 4,700,839 $ 4,603,692 Less: Assets held for sale (a) — 27,436 Operating Properties $ 4,700,839 $ 4,631,128 Corporate Construction-in-progress $ 263,772 $ 201,360 Land inventory $ 119,995 $ 90,603 (a) On December 31, 2014, the Company was actively marketing for sale its Atrium I and Libertyview properties, comprised of two office properties located in the New Jersey/Delaware segment. As of December 31, 2014 the properties were classified as held for sale on the consolidated balance sheet. The properties were sold on January 8, 2015 . See Note 3, " Real Estate Investments ," for further information. The sale is not classified as a significant disposition under the accounting guidance for discontinued operations. (b) On June 22, 2015 the Company acquired the remaining 50.0% of the common interest in Broadmoor Austin Associates. As such, the Company has seven wholly owned properties in its Austin, Texas business segment at June 30, 2015 . See Note 3, " Real Estate Investments ," for further information regarding this transaction. Net operating income: Three-month periods ended June 30, 2015 2014 Total revenue Operating expenses (a) Net operating income (loss) Total revenue Operating expenses (a) Net operating income (loss) Philadelphia CBD $ 52,420 $ (19,448 ) $ 32,972 $ 51,420 $ (18,789 ) $ 32,631 Pennsylvania Suburbs 39,010 (12,856 ) 26,154 40,743 (13,742 ) 27,001 Metropolitan Washington, D.C. 26,953 (10,544 ) 16,409 28,949 (10,505 ) 18,444 New Jersey/Delaware 11,727 (6,203 ) 5,524 14,841 (7,531 ) 7,310 Richmond, Virginia 8,956 (3,632 ) 5,324 8,322 (3,566 ) 4,756 California 3,391 (1,572 ) 1,819 4,895 (2,515 ) 2,380 Austin, Texas (b) 2,533 (1,498 ) 1,035 976 (617 ) 359 Corporate 658 (596 ) 62 354 (442 ) (88 ) Operating Properties $ 145,648 $ (56,349 ) $ 89,299 $ 150,500 $ (57,707 ) $ 92,793 Six-month periods ended June 30, 2015 2014 Total revenue Operating expenses (a) Net operating income Total revenue Operating expenses (a) Net operating income (loss) Philadelphia CBD $ 105,393 $ (37,838 ) $ 67,555 $ 100,834 $ (37,231 ) $ 63,603 Pennsylvania Suburbs 78,900 (27,441 ) 51,459 81,317 (28,431 ) 52,886 Metropolitan Washington, D.C. 54,359 (22,404 ) 31,955 59,639 (22,462 ) 37,177 New Jersey/Delaware 25,226 (14,071 ) 11,155 30,466 (16,223 ) 14,243 Richmond, Virginia 18,251 (7,904 ) 10,347 17,189 (7,906 ) 9,283 California 8,376 (4,010 ) 4,366 9,497 (4,923 ) 4,574 Austin, Texas (b) 3,467 (2,369 ) 1,098 3,057 (1,793 ) 1,264 Corporate 2,082 (1,010 ) 1,072 615 (712 ) (97 ) Operating Properties $ 296,054 $ (117,047 ) $ 179,007 $ 302,614 $ (119,681 ) $ 182,933 (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% of the common interest in Broadmoor Austin Associates. See Note 3, " Real Estate Investments ," for further information regarding this transaction. On April 3, 2014 , the Company contributed Four Points Centre to an unconsolidated real estate venture. See Note 3, " Real Estate Investments, " in notes to the audited financial statements included in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2014 . Unconsolidated real estate ventures: Investment in real estate ventures, at equity Equity in income (loss) of real estate ventures As of Three-month periods ended June 30, Six-month periods ended June 30, June 30, 2015 December 31, 2014 2015 2014 2015 2014 Philadelphia CBD (a) $ 33,961 $ 27,137 $ (150 ) $ — $ (450 ) $ (21 ) Pennsylvania Suburbs 17,220 17,385 (17 ) (391 ) (22 ) (359 ) Metropolitan Washington, D.C. 109,249 73,127 (179 ) (42 ) (229 ) 25 New Jersey/Delaware — — 116 103 164 122 Richmond, Virginia 1,506 1,574 246 115 331 69 Austin, Texas (b) (c) 39,098 105,781 (889 ) (274 ) (536 ) (83 ) Total $ 201,034 $ 225,004 $ (873 ) $ (489 ) $ (742 ) $ (247 ) (a) Equity in income as of June 30, 2014 did not include evo at Cira, which was placed into service during the third quarter ended September 30, 2014. (b) Investment in real estate ventures does not include the $1.2 million negative investment balance in one real estate venture as of June 30, 2015 and December 31, 2014, which is included in other liabilities. (c) On June 22, 2015 the Company acquired the remaining 50.0% of the common interest in Broadmoor Austin Associates. As such, equity method investment at June 30, 2015 related to the Austin Venture only. See Note 3, " Real Estate Investments ," for further information regarding the purchase of Broadmoor Austin Associates. 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 (loss), as defined by GAAP: Three-month periods ended June 30, Six-month periods ended June 30, 2015 2014 2015 2014 (amounts in thousands) Consolidated net operating income $ 89,299 $ 92,793 $ 179,007 $ 182,933 Other income (expense): Depreciation and amortization (50,930 ) (52,587 ) (102,041 ) (105,157 ) General and administrative expenses (6,791 ) (6,005 ) (15,427 ) (14,186 ) Interest income 313 385 1,063 770 Interest expense (27,895 ) (31,512 ) (56,071 ) (63,356 ) Interest expense - amortization of deferred financing costs (1,288 ) (1,197 ) (2,367 ) (2,386 ) Interest expense - financing obligation (324 ) (316 ) (610 ) (588 ) Equity in loss of real estate ventures (873 ) (489 ) (742 ) (247 ) Net gain on disposition of real estate 1,571 — 10,590 — Net gain (loss) on sale of undepreciated real estate — (3 ) — 1,184 Net gain from remeasurement of investment in a real estate venture 758 458 758 458 Loss on real estate venture transactions — (282 ) — (417 ) Provision for impairment on assets held for sale/sold (782 ) — (2,508 ) — Income (loss) from continuing operations 3,058 1,245 11,652 (992 ) Income from discontinued operations — 929 — 921 Net income (loss) $ 3,058 $ 2,174 $ 11,652 $ (71 )

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	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, may ultimately result from any current legal actions will have a material adverse effect on the Company's consolidated financial position, results of operations or cash flows. 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 under the terms of all non-cancelable ground leases under which the Company is the lessee are expensed on a straight-line basis regardless of when payments are due. The Company’s ground leases have remaining lease terms ranging from 6 to 74 years. Minimum future rental payments on non-cancelable leases at June 30, 2015 are as follows (in thousands): 2015 (six months remaining) $ 693 2016 1,385 2017 1,385 2018 1,385 2019 1,385 Thereafter 68,648 Total $ 74,881 The Company obtained ground tenancy rights related to two 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, 2014 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 independent 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.

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2015
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	SUBSEQUENT EVENTS 2100 Market Street Acquisition On July 7, 2015 , the Company acquired a 0.8 acre parcel of land located at 2100 Market Street in Philadelphia, Pennsylvania for $18.8 million . The Company funded $16.8 million of the purchase price with available corporate funds and $2.0 million was deferred until the earlier of the commencement of development or 24 months from settlement. The Company accounted for this transaction as an asset acquisition and capitalized a nominal amount of acquisition related costs and other costs as part of land inventory on its consolidated balance sheet. Share Repurchase Program On July 22, 2015, the Company's Board of Trustees has authorized additional share repurchases of up to $100.0 million of its preferred and common stock with no expiration date. The Company expects to fund the share repurchases with a combination of available cash balances and availability under its line of credit.

Basis of Presentation (Policies

Basis of Presentation (Policies)	6 Months Ended
	Jun. 30, 2015
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 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 June 30, 2015 , the results of its operations for the three and six-month periods ended June 30, 2015 and 2014 and its cash flows for the six-month periods ended June 30, 2015 and 2014 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 2014 Annual Report on Form 10-K filed with the SEC on February 19, 2015 . The Company's Annual Report on Form 10-K for the year ended December 31, 2014 contains a discussion of our significant accounting policies under Note 2, "Summary of Significant Accounting Policies". There have been no significant changes in our significant accounting policies since December 31, 2014 . Management discusses our significant accounting policies and management’s judgments and estimates with the Company's Audit Committee.
Recent Accounting Pronouncements	Recent Accounting Pronouncements On July 9, 2015, the Financial Accounting Standards Board ("FASB") elected to defer the effective date of the revenue recognition standard issued in May 2014 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 public entities are therefore required to apply the new revenue guidance beginning in their 2018 interim and annual financial statements. The Company has not yet determined the impact, if any, that the adoption of this guidance will have on its consolidated financial statements. See Note 2, " Summary of Significant Accounting Policies ," included in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2014 for the Company's initial disclosure of this standard. In April 2015, the FASB issued guidance simplifying the presentation of debt issuance costs. The guidance requires that all costs incurred to issue debt be presented in the balance sheet as a direct deduction from the carrying value of the debt. The amortization of these costs will remain under the interest method and will continue to be reported as interest expense. The guidance is effective for public companies for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. Early adoption is permitted for financial statements that have not been previously issued. The new guidance will be applied on a retrospective basis. The Company has not yet determined the impact, if any, that the adoption of this guidance will have on its consolidated financial statements. In February 2015, the FASB issued guidance modifying the analysis a reporting entity must perform to determine whether it should consolidate certain types of legal entities. The guidance does not change the general order in which the consolidation models are applied. A reporting entity that holds an economic interest in, or is otherwise involved with, another legal entity first determines if the variable interest entity model applies, and if so, whether it holds a controlling financial interest under that model. If the entity being evaluated for consolidation is not a variable interest entity, then the voting model should be applied to determine whether the entity should be consolidated by the reporting entity. Key changes to the guidance include, though are not limited to; (i.) limiting the extent to which related party interests are included in the other economic interest criterion to the decision maker’s effective interest holding, (ii.) requiring limited partners of a limited partnership, or the members of a limited liability company that is similar to a limited partnership, to have, at minimum, kick-out or participating rights to demonstrate that the partnership is a voting entity, (iii.) changing the evaluation of whether the equity holders at risk lack decision making rights when decision making is outsourced and (iv.) changing how the economics test is performed. The guidance does not amend the existing disclosure requirements for variable interest entities or voting model entities. The guidance is effective for public companies for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. Early adoption is permitted. The Company has not yet determined the impact, if any, that the adoption of this guidance will have on its consolidated financial statements.

Real Estate Investments (Tables

Real Estate Investments (Tables)	6 Months Ended
	Jun. 30, 2015
Real Estate [Abstract]
Gross Carrying Value Of Company's Properties	As of June 30, 2015 and December 31, 2014 , the gross carrying value of the Company’s Properties was as follows (in thousands): June 30, December 31, Land $ 677,644 $ 669,635 Building and improvements 3,476,667 3,409,303 Tenant improvements 546,528 524,754 4,700,839 4,603,692 Assets held for sale - real estate investments (a) — 27,436 Total $ 4,700,839 $ 4,631,128 (a) Real estate investments related to assets held for sale above represents gross real estate assets and does not include accumulated depreciation or other assets on the balance sheets of the properties held for sale.
Schedule of Purchase Price Allocation	The purchase price has been allocated as follows: June 22, 2015 Building, land and improvements $ 161,252 Land inventory 8,064 Intangible assets acquired (a) 50,637 Below market lease liabilities assumed (b) (8,600 ) $ 211,353 Return of existing equity method investment (67,261 ) Net working capital assumed (271 ) Total cash payment at settlement $ 143,821 (a) Weighted average amortization period of 4.0 years . (b) Weighted average amortization period of 1.5 years .
Schedule of Pro Forma Information	The supplemental pro forma operating data is not necessarily indicative of what the actual results of operations would have been assuming the transaction had been completed as set forth above, nor do they purport to represent the Company’s results of operations for future periods (in thousands except for per share amounts). Three-month periods ended Six-month periods ended June 30, June 30, 2015 2014 2015 2014 Pro forma revenue $ 148,677 $ 153,893 $ 302,323 $ 309,771 Pro forma income from continuing operations 5,210 3,767 16,277 4,391 Pro forma net income available to common shareholders 3,407 2,907 12,590 1,727 Earnings (loss) per common share from continuing operations: Basic -- as reported $ 0.01 $ 0.01 $ 0.06 $ (0.01 ) Basic -- as pro forma $ 0.03 $ 0.02 $ 0.09 $ 0.03 Diluted -- as reported $ 0.01 $ 0.01 $ 0.06 $ (0.01 ) Diluted -- as pro forma $ 0.03 $ 0.02 $ 0.09 $ 0.03 Earnings (loss) per common share: Basic -- as reported $ — $ — $ 0.04 $ (0.02 ) Basic -- as pro forma $ 0.02 $ 0.02 $ 0.07 $ 0.01 Diluted -- as reported $ — $ — $ 0.04 $ (0.02 ) Diluted -- as pro forma $ 0.02 $ 0.02 $ 0.07 $ 0.01
Dispositions	The Company sold the following properties during the six-month period ended June 30, 2015 (dollars in millions). Disposition Date Property Name Property Location Property Type Number of Properties Sale Price Gain/(Loss) On Sale (a) Rentable Square Feet June 10, 2015 100 Gateway Centre Parkway Richmond, VA Office 1 $ 4.1 $ — (b) 74,991 April 24, 2015 Delaware Corporate Center I & II/Christian Corporate Center Wilmington, DE/Newark, DE Office 5 50.1 1.6 485,182 April 9, 2015 Lake Merritt Tower Oakland, CA Office 1 65.0 — (c) 204,336 January 8, 2015 Atrium I/Libertyview Mt. Laurel, NJ/Cherry Hill, NJ Office 2 28.3 9.0 221,405 Total Dispositions 9 $ 147.5 $ 10.6 985,914 (a) Gain/(Loss) on Sale is net of closing and other transaction related costs. (b) The Company recorded an impairment loss of $0.8 million for 100 Gateway Centre Parkway during the second quarter of 2015. As such, there was no gain/(loss) at disposition for this property. (c) The Company recorded an impairment loss of $1.7 million for Lake Merritt Tower at March 31, 2015. As such, there was no gain/(loss) at disposition for this property. Sales proceeds were deposited in escrow under Section 1031 of the Internal Revenue Code and applied to purchase the Broadmoor Austin portfolio. Refer to Broadmoor Austin Associates acquisition summary, above, for further details.

Investment in Unconsolidated 25

Investment in Unconsolidated Ventures (Tables)	6 Months Ended
	Jun. 30, 2015
Equity Method Investments and Joint Ventures [Abstract]
Summary of Real Estate Ventures	The following is a summary of the financial position of the Real Estate Ventures as of June 30, 2015 and December 31, 2014 (in thousands): June 30, December 31, Net property $ 1,295,947 $ 1,281,282 Other assets 165,693 195,121 Other liabilities 59,472 68,481 Debt 927,032 965,077 Equity 475,136 442,845 Company’s share of equity (Company’s basis) (a) (b) $ 201,034 $ 225,004 (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 of one real estate venture totaling $1.2 million as of June 30, 2015 and December 31, 2014, respectively, which is included in other liabilities.
Summary of results of operations of unconsolidated Real Estate Venture	The following is a summary of results of operations of the Real Estate Ventures in which the Company had interests during these periods (in thousands): Three-month periods ended June 30, Six-month periods ended June 30, 2015 2014 2015 2014 Revenue $ 43,239 $ 35,074 $ 89,348 $ 69,459 Operating expenses (19,132 ) (14,842 ) (37,665 ) (28,824 ) Interest expense, net (10,136 ) (8,889 ) (19,982 ) (16,989 ) Depreciation and amortization (17,412 ) (13,273 ) (36,536 ) (26,871 ) Net loss $ (3,441 ) $ (1,930 ) $ (4,835 ) $ (3,225 ) Company’s share of loss (Company’s basis) $ (873 ) $ (489 ) $ (742 ) $ (247 )

Intangible Assets (Tables)

Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of Intangible Assets and Liabilities	As of June 30, 2015 and December 31, 2014 , the Company’s intangible assets/liabilities were comprised of the following (in thousands): June 30, 2015 Total Cost Accumulated Amortization Intangible assets/liabilities, net Intangible assets, net: In-place lease value $ 176,041 $ (48,435 ) $ 127,606 Tenant relationship value 30,203 (24,339 ) 5,864 Above market leases acquired 5,510 (1,690 ) 3,820 Total intangible assets, net $ 211,754 $ (74,464 ) $ 137,290 Acquired lease intangibles, net: Below market leases acquired $ 60,963 $ (29,398 ) $ 31,565 December 31, 2014 Total Cost Accumulated Amortization Intangible assets/liabilities, net Intangible assets, net: In-place lease value $ 129,411 $ (42,068 ) $ 87,343 Tenant relationship value 34,172 (26,344 ) 7,828 Above market leases acquired 5,641 (1,409 ) 4,232 Total intangible assets, net $ 169,224 $ (69,821 ) $ 99,403 Acquired lease intangibles, net: Below market leases acquired $ 53,049 $ (27,039 ) $ 26,010
Summary of Amortization for Intangible Assets and Liabilities	As of June 30, 2015 , the Company’s annual amortization for its intangible assets/liabilities were as follows (in thousands, and assuming no prospective early lease terminations): Assets Liabilities 2015 (six months remaining) $ 25,005 $ 5,693 2016 36,642 7,595 2017 19,815 3,461 2018 12,585 2,217 2019 11,286 1,885 Thereafter 31,957 10,714 Total $ 137,290 $ 31,565

Fair Value of Financial Instr27

Fair Value of Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2015
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): June 30, 2015 December 31, 2014 Carrying Amount Fair Value Carrying Amount Fair Value Unsecured notes payable $ 1,518,657 $ 1,564,314 $ 1,518,108 $ 1,593,212 Variable rate debt $ 278,610 $ 257,443 $ 278,610 $ 257,188 Mortgage notes payable $ 646,512 $ 679,363 $ 654,590 $ 707,241 Mortgage note receivable (a) $ — $ — $ 88,000 $ 87,692 (a) On January 30, 2015 the mortgage note was repaid. For further information regarding the mortgage note, see Note 2, " Summary of Significant Accounting Policies ," included in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2014.

Beneficiaries Equity of the P28

Beneficiaries Equity of the Parent Company (Tables)	6 Months Ended
	Jun. 30, 2015
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 June 30, 2015 2014 Basic Diluted Basic Diluted Numerator Income from continuing operations $ 3,058 $ 3,058 $ 1,245 $ 1,245 Net (income) loss from continuing operations attributable to non-controlling interests - LP units (7 ) (7 ) 5 5 Net loss attributable to non-controlling interest — partners' share of consolidated real estate ventures 5 5 24 24 Nonforfeitable dividends allocated to unvested restricted shareholders (76 ) (76 ) (83 ) (83 ) Preferred share dividends (1,725 ) (1,725 ) (1,725 ) (1,725 ) Income (loss) from continuing operations available to common shareholders 1,255 1,255 (534 ) (534 ) Income from discontinued operations — — 929 929 Discontinued operations attributable to non-controlling interests — — (10 ) (10 ) Discontinued operations attributable to common shareholders — — 919 919 Net income attributable to common shareholders $ 1,255 $ 1,255 $ 385 $ 385 Denominator Weighted-average shares outstanding 179,860,284 179,860,284 157,037,348 157,037,348 Contingent securities/Share based compensation — 678,603 — — Weighted-average shares outstanding 179,860,284 180,538,887 157,037,348 157,037,348 Earnings per Common Share: Income from continuing operations attributable to common shareholders $ 0.01 $ 0.01 $ — $ — Discontinued operations attributable to common shareholders — — — — Net income attributable to common shareholders $ 0.01 $ 0.01 $ — $ — Six-month periods ended June 30, 2015 2014 Basic Diluted Basic Diluted Numerator Income (loss) from continuing operations $ 11,652 $ 11,652 $ (992 ) $ (992 ) Net (income) loss from continuing operations attributable to non-controlling interests - LP Units (65 ) (65 ) 49 49 Net loss attributable to non-controlling interest — partners' share of consolidated real estate ventures 5 5 12 12 Nonforfeitable dividends allocated to unvested restricted shareholders (177 ) (177 ) (186 ) (186 ) Preferred share dividends (3,450 ) (3,450 ) (3,450 ) (3,450 ) Income (loss) from continuing operations available to common shareholders 7,965 7,965 (4,567 ) (4,567 ) Income from discontinued operations — — 921 921 Discontinued operations attributable to non-controlling interests — — (10 ) (10 ) Discontinued operations attributable to common shareholders — — 911 911 Net income (loss) attributable to common shareholders $ 7,965 $ 7,965 $ (3,656 ) $ (3,656 ) Denominator Weighted-average shares outstanding 179,712,428 179,712,428 156,916,356 156,916,356 Contingent securities/Share based compensation — 886,837 — — Weighted-average shares outstanding 179,712,428 180,599,265 156,916,356 156,916,356 Earnings per Common Share: Income (loss) from continuing operations attributable to common shareholders $ 0.04 $ 0.04 $ (0.03 ) $ (0.03 ) Discontinued operations attributable to common shareholders — — 0.01 0.01 Net income (loss) attributable to common shareholders $ 0.04 $ 0.04 $ (0.02 ) $ (0.02 )

Partners Equity of the Operat29

Partners Equity of the Operating Partnership (Tables)	6 Months Ended
	Jun. 30, 2015
Equity [Abstract]
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 June 30, 2015 2014 Basic Diluted Basic Diluted Numerator Income from continuing operations $ 3,058 $ 3,058 $ 1,245 $ 1,245 Nonforfeitable dividends allocated to unvested restricted unitholders (76 ) (76 ) (83 ) (83 ) Preferred unit dividends (1,725 ) (1,725 ) (1,725 ) (1,725 ) Net loss attributable to non-controlling interests 5 5 24 24 Loss from continuing operations available to common unitholders 1,262 1,262 (539 ) (539 ) Discontinued operations attributable to common unitholders — — 929 929 Net income attributable to common unitholders $ 1,262 $ 1,262 $ 390 $ 390 Denominator Weighted-average units outstanding 181,395,386 181,395,386 158,801,087 158,801,087 Contingent securities/Share based compensation — 678,603 — — Total weighted-average units outstanding 181,395,386 182,073,989 158,801,087 158,801,087 Earnings per Common Partnership Unit: Income from continuing operations attributable to common unitholders $ 0.01 $ 0.01 $ — $ — Discontinued operations attributable to common unitholders — — — — Net income attributable to common unitholders $ 0.01 $ 0.01 $ — $ — Six-month periods ended June 30, 2015 2014 Basic Diluted Basic Diluted Numerator Income (loss) from continuing operations $ 11,652 $ 11,652 $ (992 ) $ (992 ) Amount allocable to unvested restricted unitholders (177 ) (177 ) (186 ) (186 ) Preferred unit dividends (3,450 ) (3,450 ) (3,450 ) (3,450 ) Net income attributable to non-controlling interests 5 5 12 12 Income (loss) from continuing operations available to common unitholders 8,030 8,030 (4,616 ) (4,616 ) Discontinued operations attributable to common unitholders — — 921 921 Net income (loss) attributable to common unitholders $ 8,030 $ 8,030 $ (3,695 ) $ (3,695 ) Denominator Weighted-average units outstanding 181,247,530 181,247,530 158,680,095 158,680,095 Contingent securities/Share based compensation — 886,837 — — Total weighted-average units outstanding 181,247,530 182,134,367 158,680,095 158,680,095 Earnings per Common Partnership Unit: Income (loss) from continuing operations attributable to common unitholders $ 0.04 $ 0.04 $ (0.03 ) $ (0.03 ) Discontinued operations attributable to common unitholders — — 0.01 0.01 Net income (loss) attributable to common unitholders $ 0.04 $ 0.04 $ (0.02 ) $ (0.02 )

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Jun. 30, 2015
Segment Reporting [Abstract]
Schedule 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: June 30, 2015 December 31, 2014 Philadelphia CBD $ 1,386,017 $ 1,338,655 Pennsylvania Suburbs 1,180,974 1,178,470 Metropolitan Washington, D.C. 1,211,886 1,183,652 New Jersey/Delaware (a) 330,051 392,581 Richmond, Virginia 310,648 317,076 California 119,360 193,258 Austin, Texas (b) 161,903 — $ 4,700,839 $ 4,603,692 Less: Assets held for sale (a) — 27,436 Operating Properties $ 4,700,839 $ 4,631,128 Corporate Construction-in-progress $ 263,772 $ 201,360 Land inventory $ 119,995 $ 90,603 (a) On December 31, 2014, the Company was actively marketing for sale its Atrium I and Libertyview properties, comprised of two office properties located in the New Jersey/Delaware segment. As of December 31, 2014 the properties were classified as held for sale on the consolidated balance sheet. The properties were sold on January 8, 2015 . See Note 3, " Real Estate Investments ," for further information. The sale is not classified as a significant disposition under the accounting guidance for discontinued operations. (b) On June 22, 2015 the Company acquired the remaining 50.0% of the common interest in Broadmoor Austin Associates. As such, the Company has seven wholly owned properties in its Austin, Texas business segment at June 30, 2015 . See Note 3, " Real Estate Investments ," for further information regarding this transaction.
Schedule of Segment Net Operating Income, by Segment	Net operating income: Three-month periods ended June 30, 2015 2014 Total revenue Operating expenses (a) Net operating income (loss) Total revenue Operating expenses (a) Net operating income (loss) Philadelphia CBD $ 52,420 $ (19,448 ) $ 32,972 $ 51,420 $ (18,789 ) $ 32,631 Pennsylvania Suburbs 39,010 (12,856 ) 26,154 40,743 (13,742 ) 27,001 Metropolitan Washington, D.C. 26,953 (10,544 ) 16,409 28,949 (10,505 ) 18,444 New Jersey/Delaware 11,727 (6,203 ) 5,524 14,841 (7,531 ) 7,310 Richmond, Virginia 8,956 (3,632 ) 5,324 8,322 (3,566 ) 4,756 California 3,391 (1,572 ) 1,819 4,895 (2,515 ) 2,380 Austin, Texas (b) 2,533 (1,498 ) 1,035 976 (617 ) 359 Corporate 658 (596 ) 62 354 (442 ) (88 ) Operating Properties $ 145,648 $ (56,349 ) $ 89,299 $ 150,500 $ (57,707 ) $ 92,793 Six-month periods ended June 30, 2015 2014 Total revenue Operating expenses (a) Net operating income Total revenue Operating expenses (a) Net operating income (loss) Philadelphia CBD $ 105,393 $ (37,838 ) $ 67,555 $ 100,834 $ (37,231 ) $ 63,603 Pennsylvania Suburbs 78,900 (27,441 ) 51,459 81,317 (28,431 ) 52,886 Metropolitan Washington, D.C. 54,359 (22,404 ) 31,955 59,639 (22,462 ) 37,177 New Jersey/Delaware 25,226 (14,071 ) 11,155 30,466 (16,223 ) 14,243 Richmond, Virginia 18,251 (7,904 ) 10,347 17,189 (7,906 ) 9,283 California 8,376 (4,010 ) 4,366 9,497 (4,923 ) 4,574 Austin, Texas (b) 3,467 (2,369 ) 1,098 3,057 (1,793 ) 1,264 Corporate 2,082 (1,010 ) 1,072 615 (712 ) (97 ) Operating Properties $ 296,054 $ (117,047 ) $ 179,007 $ 302,614 $ (119,681 ) $ 182,933 (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% of the common interest in Broadmoor Austin Associates. See Note 3, " Real Estate Investments ," for further information regarding this transaction. On April 3, 2014 , the Company contributed Four Points Centre to an unconsolidated real estate venture. See Note 3, " Real Estate Investments, " in notes to the audited financial statements included in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2014 .
Schedule of Segment Reporting Information, by Segment	Unconsolidated real estate ventures: Investment in real estate ventures, at equity Equity in income (loss) of real estate ventures As of Three-month periods ended June 30, Six-month periods ended June 30, June 30, 2015 December 31, 2014 2015 2014 2015 2014 Philadelphia CBD (a) $ 33,961 $ 27,137 $ (150 ) $ — $ (450 ) $ (21 ) Pennsylvania Suburbs 17,220 17,385 (17 ) (391 ) (22 ) (359 ) Metropolitan Washington, D.C. 109,249 73,127 (179 ) (42 ) (229 ) 25 New Jersey/Delaware — — 116 103 164 122 Richmond, Virginia 1,506 1,574 246 115 331 69 Austin, Texas (b) (c) 39,098 105,781 (889 ) (274 ) (536 ) (83 ) Total $ 201,034 $ 225,004 $ (873 ) $ (489 ) $ (742 ) $ (247 ) (a) Equity in income as of June 30, 2014 did not include evo at Cira, which was placed into service during the third quarter ended September 30, 2014. (b) Investment in real estate ventures does not include the $1.2 million negative investment balance in one real estate venture as of June 30, 2015 and December 31, 2014, which is included in other liabilities. (c) On June 22, 2015 the Company acquired the remaining 50.0% of the common interest in Broadmoor Austin Associates. As such, equity method investment at June 30, 2015 related to the Austin Venture only. See Note 3, " Real Estate Investments ," for further information regarding the purchase of Broadmoor Austin Associates.
Reconciliation of Consolidated Net Operating Income	The following is a reconciliation of consolidated NOI to consolidated net income (loss), as defined by GAAP: Three-month periods ended June 30, Six-month periods ended June 30, 2015 2014 2015 2014 (amounts in thousands) Consolidated net operating income $ 89,299 $ 92,793 $ 179,007 $ 182,933 Other income (expense): Depreciation and amortization (50,930 ) (52,587 ) (102,041 ) (105,157 ) General and administrative expenses (6,791 ) (6,005 ) (15,427 ) (14,186 ) Interest income 313 385 1,063 770 Interest expense (27,895 ) (31,512 ) (56,071 ) (63,356 ) Interest expense - amortization of deferred financing costs (1,288 ) (1,197 ) (2,367 ) (2,386 ) Interest expense - financing obligation (324 ) (316 ) (610 ) (588 ) Equity in loss of real estate ventures (873 ) (489 ) (742 ) (247 ) Net gain on disposition of real estate 1,571 — 10,590 — Net gain (loss) on sale of undepreciated real estate — (3 ) — 1,184 Net gain from remeasurement of investment in a real estate venture 758 458 758 458 Loss on real estate venture transactions — (282 ) — (417 ) Provision for impairment on assets held for sale/sold (782 ) — (2,508 ) — Income (loss) from continuing operations 3,058 1,245 11,652 (992 ) Income from discontinued operations — 929 — 921 Net income (loss) $ 3,058 $ 2,174 $ 11,652 $ (71 )

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
Operating Leases Future Minimum Payments Due	Minimum future rental payments on non-cancelable leases at June 30, 2015 are as follows (in thousands): 2015 (six months remaining) $ 693 2016 1,385 2017 1,385 2018 1,385 2019 1,385 Thereafter 68,648 Total $ 74,881

Organization of the Parent Co32

Organization of the Parent Company and The Operating Partnership (Details) ft² in Millions	Jun. 30, 2015aft²propertyreal_estate_investment	Jun. 30, 2014ft²
Organization of The Parent Company and The Operating Partnership [Line Items]
Number of Properties	9
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	25.2
Area Owned by Company of Undeveloped Parcels Of Land | a	430
Area Of Additional Undeveloped Parcels Of Land With Option to Purchase | a	63
Total Potential Development Capacity | ft²	7.2
Unconsolidated Real Estate Ventures [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Net Rentable Square Feet | ft²	5.6	5.9
Number of Unconsolidated Real Estate Ventures | real_estate_investment	18
Wholly-owned Management Company Subsidiaries [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Net Rentable Square Feet | ft²	33
Third Parties and Real Estate Ventures [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Net Rentable Square Feet | ft²	7.8
Total Properties [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Number of Properties	199
Office Properties [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Number of Properties	167
Industrial Facilities [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Number of Properties	20
Mixed Use Properties [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Number of Properties	5
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	193
Development Property [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Number of Properties	4
Redevelopment Property [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Number of Properties	1
Re-entitlement Property [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Number of Properties	1
Wholly Owned Properties [Member] | Parent Company [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Net Rentable Square Feet | ft²	25.2

Real Estate Investments Gross C

Real Estate Investments Gross Carrying Value of Company's Properties (Details) - USD ($) $ in Thousands		Jun. 30, 2015	Dec. 31, 2014
Property, Plant and Equipment, Gross [Abstract]
Land		$ 677,644	$ 669,635
Building and improvements		3,476,667	3,409,303
Tenant improvements		546,528	524,754
Real Estate Investments		4,700,839	4,603,692
Assets held for sale - real estate investments	[1]	0	27,436
Total		$ 4,700,839	$ 4,631,128
[1]	Real estate investments related to assets held for sale above represents gross real estate assets and does not include accumulated depreciation or other assets on the balance sheets of the properties held for sale.

Real Estate Investments Acquisi

Real Estate Investments Acquisitions (Details) $ in Thousands	Jun. 22, 2015USD ($)aft²	May. 12, 2015USD ($)ft²	Apr. 09, 2015USD ($)a	Apr. 06, 2015USD ($)a	Apr. 02, 2015USD ($)ft²parking_space	Jun. 30, 2015USD ($)ft²Properties	Jun. 30, 2014USD ($)	Jun. 30, 2015USD ($)ft²Properties	Jun. 30, 2014USD ($)
Significant Acquisitions and Disposals [Line Items]
Rentable Square Feet | ft²						985,914		985,914
Net gain from remeasurement of investments in real estate ventures						$ 758	$ 458	$ 758	$ 458
Net Rentable Space | parking_space					330
Broadmoor Austin Associates [Member]
Significant Acquisitions and Disposals [Line Items]
Area Owned by Company of Undeveloped Parcels Of Land | a	66
Purchase Price of Assets	$ 211,400
Rentable Square Feet | ft²	1,112,236
Lease Percentage of Acquired Property						100.00%		100.00%
Payments to Acquire Land	$ 143,800
Amount funded by corporate funds	81,000
Funds Held in Escrow	62,800
Mortgage Debt Paid at Closing	$ 51,200
Ownership percentage	50.00%
Percentage of ownership interests	50.00%
Net gain from remeasurement of investments in real estate ventures	$ 800
Building, land and improvements	161,252
Broadmoor Austin Associates [Member] | General and Administrative Expense [Member]
Significant Acquisitions and Disposals [Line Items]
Acquisition Costs	$ 200
405 Colorado Drive [Member]
Significant Acquisitions and Disposals [Line Items]
Area Owned by Company of Undeveloped Parcels Of Land | a			0.4
Payments to Acquire Land			$ 2,600
Land - 25 M Street [Member]
Significant Acquisitions and Disposals [Line Items]
Area Owned by Company of Undeveloped Parcels Of Land | a				0.8
Total Potential Development Capacity | ft²		271,000
Payments to Acquire Land				$ 20,300
Acquisition Costs				$ 300
Percent of Acquired Entity		95.00%
Land - 25 M Street [Member] | Akridge [Member]
Significant Acquisitions and Disposals [Line Items]
Payments to Acquire Land		$ 1,000
Asset Acquisition Ownership Percent		5.00%
618 Market Street [Member]
Significant Acquisitions and Disposals [Line Items]
Total Potential Development Capacity | ft²					14,404
Payments to Acquire Land					$ 19,400
Fair Value of Contingent Consideration					1,600
Consideration, Cash					17,800
Building, land and improvements					19,200
Intangible Assets					$ 200
Office Building [Member] | Broadmoor Austin Associates [Member]
Significant Acquisitions and Disposals [Line Items]
Number of Units in Real Estate Property | Properties						7		7

Real Estate Investments Purchas

Real Estate Investments Purchase Price Allocation (Details) - Jun. 22, 2015 - Broadmoor Austin Associates [Member] - USD ($) $ in Thousands		Total
Business Acquisition [Line Items]
Building, land and improvements		$ 161,252
Land inventory		8,064
Intangible assets acquired	[1]	50,637
Below market lease liabilities assumed	[2]	(8,600)
Total purchase price		211,353
Return of existing equity method investment		(67,261)
Net working capital assumed		(271)
Total cash payment at settlement		$ 143,821
Weighted average amortization period		4 years
Below Market Lease [Member]
Business Acquisition [Line Items]
Weighted average amortization period		1 year 6 months
[1]	Weighted average amortization period of 4.0 years.
[2]	Weighted average amortization period of 1.5 years.

Real Estate Investments Pro For

Real Estate Investments Pro Forma (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings per common share from continuing operations:
Income (loss) from continuing operations attributable to common shareholders, Basic (USD per share)	$ 0.01	$ 0	$ 0.04	$ (0.03)
Income (loss) from continuing operations attributable to common shareholders, Dilued (USD per share)	0.01	0	0.04	(0.03)
Earnings per common share:
Basic -- as reported (USD per share)	0.01	0	0.04	(0.02)
Diluted -- as reported (USD per share)	$ 0.01	$ 0	$ 0.04	$ (0.02)
Pro Forma Properties [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Pro forma revenue	$ 148,677	$ 153,893	$ 302,323	$ 309,771
Pro forma income from continuing operations	5,210	3,767	16,277	4,391
Pro forma net income available to common shareholders	$ 3,407	$ 2,907	$ 12,590	$ 1,727
Earnings per common share from continuing operations:
Income (loss) from continuing operations attributable to common shareholders, Basic (USD per share)	$ 0.01	$ 0.01	$ 0.06	$ (0.01)
Basic -- as pro forma (USD per share)	0.03	0.02	0.09	0.03
Income (loss) from continuing operations attributable to common shareholders, Dilued (USD per share)	0.01	0.01	0.06	(0.01)
Diluted -- as pro forma (USD per share)	0.03	0.02	0.09	0.03
Earnings per common share:
Basic -- as reported (USD per share)	0	0	0.04	(0.02)
Basic -- as pro forma (USD per share)	0.02	0.02	0.07	0.01
Diluted -- as reported (USD per share)	0	0	0.04	(0.02)
Diluted -- as pro forma (USD per share)	$ 0.02	$ 0.02	$ 0.07	$ 0.01
Total revenues	$ 3.2	$ 3.4	$ 6.5	$ 7.2
Net income attributable to common shareholders	$ 2.7	$ 2.5	$ 5.1	$ 5.4

Real Estate Investments Disposi

Real Estate Investments Dispositions (Details) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015USD ($)ft²property	Jun. 30, 2014USD ($)	Jun. 30, 2015USD ($)ft²property		Jun. 30, 2014USD ($)
Significant Acquisitions and Disposals [Line Items]
Number of Properties | property		9		9
Sale Price		$ 147,500		$ 147,500
Gain/(Loss) On Sale		$ 1,571	$ 0	$ 10,590	[1]	$ 0
Rentable Square Feet | ft²		985,914		985,914
Provision for impairment on assets held for sale		$ 782	$ 0	$ 2,508		$ 0
Sold Property		$ 147,500		147,500
Original Disposition Target				180,000
Disposition Target				$ 300,000
100 Gateway Centre Parkway [Member]
Significant Acquisitions and Disposals [Line Items]
Number of Properties | property		1		1
Sale Price		$ 4,100		$ 4,100
Gain/(Loss) On Sale	[1],[2]			$ 0
Rentable Square Feet | ft²		74,991		74,991
Provision for impairment on assets held for sale				$ 800
Delaware Corporate Center I and II and Christiana Corporate Center [Member]
Significant Acquisitions and Disposals [Line Items]
Number of Properties | property		5		5
Sale Price		$ 50,100		$ 50,100
Gain/(Loss) On Sale	[1]			$ 1,600
Rentable Square Feet | ft²		485,182		485,182
Lake Merritt Tower [Member]
Significant Acquisitions and Disposals [Line Items]
Number of Properties | property		1		1
Sale Price		$ 65,000		$ 65,000
Gain/(Loss) On Sale	[1],[3]			$ 0
Rentable Square Feet | ft²		204,336		204,336
Provision for impairment on assets held for sale				$ 1,700
1000 Atrium Way and Libertyview [Member]
Significant Acquisitions and Disposals [Line Items]
Number of Properties | property		2		2
Sale Price		$ 28,300		$ 28,300
Gain/(Loss) On Sale	[1]			$ 9,000
Rentable Square Feet | ft²		221,405		221,405
[1]	Gain/(Loss) on Sale is net of closing and other transaction related costs.
[2]	The Company recorded an impairment loss of $0.8 million for 100 Gateway Centre Parkway during the second quarter of 2015. As such, there was no gain/(loss) at disposition for this property.
[3]	The Company recorded an impairment loss of $1.7 million for Lake Merritt Tower at March 31, 2015. As such, there was no gain/(loss) at disposition for this property. Sales proceeds were deposited in escrow under Section 1031 of the Internal Revenue Code and applied to purchase the Broadmoor Austin portfolio. Refer to Broadmoor Austin Associates acquisition summary, above, for further details.

Investment in Unconsolidated 38

Investment in Unconsolidated Ventures (Narrative) (Details) $ in Thousands	Jun. 22, 2015USD ($)ft²	May. 29, 2015USD ($)a	Feb. 27, 2015USD ($)	Jan. 30, 2015USD ($)	Jun. 30, 2015USD ($)aft²Roompropertyreal_estate_venturebuildingapartment_unit	Dec. 31, 2014USD ($)	Jun. 30, 2014ft²real_estate_venture	Dec. 19, 2007ft²Properties
Schedule of Equity Method Investments [Line Items]
Number of unconsolidated investments in Real Estate Ventures | real_estate_venture					18		17
Equity method Investments including net liabilities					$ 199,800
Company's share of equity (Company's basis)					$ 201,034	$ 225,004
Number of negative investment real estate ventures | real_estate_venture					1
Number of real estate ventures that owns buildings | real_estate_venture					10
Number of office buildings in Real Estate Ventures | building					58
Aggregate approximate area of office buildings | ft²					5,600,000
Number of real estate ventures that owns undeveloped land | real_estate_venture					4
Area owned by real estate venture of undeveloped parcels of land | a					5.2
Number of real estate ventures that owns land under development | real_estate_venture					2
Area owned by real estate venture in parcels of land under development | a					21.8
Number of real estate Investments in residential towers | real_estate_venture					1
Number of apartment units in a real estate Venture | apartment_unit					345
Number of real estate ventures developed hotel property | real_estate_venture					1
Number of rooms contain in one real estate venture developed as hotel property | Room					137
Minimum percentage of unconsolidated equity method investment ownership					20.00%
Maximum percentage of unconsolidated equity method investment ownership					70.00%
Number of Properties | property					9
Rentable Square Feet | ft²					985,914
River Place [Member]
Schedule of Equity Method Investments [Line Items]
Proceeds from collection of notes receivable				$ 88,000
Coppell Associates [Member]
Schedule of Equity Method Investments [Line Items]
Company's share of equity (Company's basis)					$ (1,200)	$ (1,200)
51 N 50 Patterson [Member]
Schedule of Equity Method Investments [Line Items]
Area owned by real estate venture of undeveloped parcels of land | a		0.9
Ownership percentage		70.00%
Payments to acquire land		$ 15,200
1250 First Street Office [Member]
Schedule of Equity Method Investments [Line Items]
Area owned by real estate venture of undeveloped parcels of land | a		0.5
Ownership percentage		70.00%
Payments to acquire land		$ 13,200
GI Interchange Office LLC (DRA — N. PA) [Member]
Schedule of Equity Method Investments [Line Items]
Number of Properties | Properties								29
Rentable Square Feet | ft²								1,611,961
Non-recourse debt			$ 174,200
Lender extension term			60 days
Unconsolidated Real Estate Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Net rentable square feet | ft²					5,600,000		5,900,000
TB-BDN Plymouth Apartments [Member]
Schedule of Equity Method Investments [Line Items]
Guarantor obligations, current carrying value					$ 3,200
The Grove at Cira Centre South [Member]
Schedule of Equity Method Investments [Line Items]
Guarantor obligations, current carrying value					24,700
PJP VII [Member]
Schedule of Equity Method Investments [Line Items]
Guarantor obligations, current carrying value					$ 500
JBG [Member] | 51 N 50 Patterson [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage		30.00%
Payments to acquire land		$ 6,500
JBG [Member] | 1250 First Street Office [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage		30.00%
Payments to acquire land		$ 5,700
Brandywine Realty Trust [Member] | GI Interchange Office LLC (DRA — N. PA) [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage								20.00%
Broadmoor Austin Associates [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	50.00%
Payments to acquire land	$ 143,800
Rentable Square Feet | ft²	1,112,236

Investment in Unconsolidated 39

Investment in Unconsolidated Ventures (Financial Position of Unconsolidated Real Estate Ventures) (Details) - USD ($) $ in Thousands		Jun. 30, 2015	Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]
Company's share of equity (Company's basis)		$ 201,034	$ 225,004
Coppell Associates [Member]
Schedule of Equity Method Investments [Line Items]
Company's share of equity (Company's basis)		(1,200)	(1,200)
Unconsolidated Real Estate Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Net property		1,295,947	1,281,282
Other assets		165,693	195,121
Other liabilities		59,472	68,481
Debt		927,032	965,077
Equity		475,136	442,845
Company's share of equity (Company's basis)	[1],[2]	$ 201,034	$ 225,004
[1]	Does not include the negative investment balance of one real estate venture totaling $1.2 million as of June 30, 2015 and December 31, 2014, respectively, which is included in other liabilities.
[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 40

Investment in Unconsolidated Ventures (Summary of Results of Operations of Unconsolidated Ventures) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Schedule of Equity Method Investments [Line Items]
Company’s share of loss (Company’s basis)	$ (873)	$ (489)	$ (742)	$ (247)
Unconsolidated Real Estate Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Revenue	43,239	35,074	89,348	69,459
Operating expenses	(19,132)	(14,842)	(37,665)	(28,824)
Interest expense, net	(10,136)	(8,889)	(19,982)	(16,989)
Depreciation and amortization	(17,412)	(13,273)	(36,536)	(26,871)
Net loss	(3,441)	(1,930)	(4,835)	(3,225)
Company’s share of loss (Company’s basis)	$ (873)	$ (489)	$ (742)	$ (247)

Intangible Assets (Details)

Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Intangible Assets [Line Items]
Total Cost	$ 211,754	$ 169,224
Accumulated Amortization	(74,464)	(69,821)
Intangible Assets, net	137,290	99,403
Below Market Lease, Gross	60,963	53,049
Below Market Lease, Accumulated Amortization	(29,398)	(27,039)
Below Market Lease, Net	31,565	26,010
In-place lease value [Member]
Intangible Assets [Line Items]
Total Cost	176,041	129,411
Accumulated Amortization	(48,435)	(42,068)
Intangible Assets, net	127,606	87,343
Tenant relationship value [Member]
Intangible Assets [Line Items]
Total Cost	30,203	34,172
Accumulated Amortization	(24,339)	(26,344)
Intangible Assets, net	5,864	7,828
Above market leases acquired [Member]
Intangible Assets [Line Items]
Total Cost	5,510	5,641
Accumulated Amortization	(1,690)	(1,409)
Intangible Assets, net	$ 3,820	$ 4,232

Intangible Assets and Liabili42

Intangible Assets and Liabilities Annual Amortization of Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Assets
Intangible Assets, net	$ 137,290	$ 99,403
Liabilities
Below Market Lease, Net	31,565	$ 26,010
Assets [Member]
Assets
2015 (six months remaining)	25,005
2,016	36,642
2,017	19,815
2,018	12,585
2,019	11,286
Thereafter	31,957
Intangible Assets, net	137,290
Liabilities [Member]
Liabilities
2015 (six months remaining)	5,693
2,016	7,595
2,017	3,461
2,018	2,217
2,019	1,885
Thereafter	10,714
Below Market Lease, Net	$ 31,565

Debt Obligations (Details)

Debt Obligations (Details)	May. 15, 2015USD ($)	Jun. 30, 2015USD ($)	Jun. 30, 2015USD ($)
Secured Debt [Member]
Debt Instrument [Line Items]
Mortgage debt principal payment		$ 3,600,000	$ 7,200,000
New Credit Facility [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt term	4 years
Maximum borrowing capacity	$ 600,000,000
Increase in limit	$ 400,000,000
Effective percentage rate, minimum	0.00%
Effective percentage rate, maximum	0.55%
Commitment fee percentage	0.25%
Minimum fixed charge coverage ratio	1.5
Maximum leverage ratio	0.60
Maximum unsecured indebtedness to unencumbered asset value ratio	0.60
Maximum secured indebtedness to total asset value ratio	0.40
Minimum unencumbered cash flow to interest expense on unsecured debt ratio	1.75
Maximum percent of payments of dividends and distributions	95.00%
New Credit Facility [Member] | Revolving Credit Facility [Member] | Minimum [Member]
Debt Instrument [Line Items]
Commitment fee percentage	0.125%
New Credit Facility [Member] | Revolving Credit Facility [Member] | Maximum [Member]
Debt Instrument [Line Items]
Commitment fee percentage	0.30%
New Credit Facility [Member] | Revolving Credit Facility [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.00%
Basis spread on variable rate	1.20%
New Credit Facility [Member] | Revolving Credit Facility [Member] | LIBOR [Member] | Minimum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	0.875%
New Credit Facility [Member] | Revolving Credit Facility [Member] | LIBOR [Member] | Maximum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.55%
New Credit Facility [Member] | Revolving Credit Facility [Member] | Federal Funds Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	0.50%
New Credit Facility [Member] | Letter of Credit [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 65,000,000
New Credit Facility [Member] | Swing-Loans [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 60,000,000

Fair Value of Financial Instr44

Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands		Jun. 30, 2015	Dec. 31, 2014
Carrying Amount
Unsecured notes payable		$ 1,518,657	$ 1,518,108
Variable rate debt		278,610	278,610
Mortgage notes payable		646,512	654,590
Mortgage note receivable	[1]	0	88,000
Fair Value
Unsecured notes payable		1,564,314	1,593,212
Variable rate debt		257,443	257,188
Mortgage notes payable		679,363	707,241
Mortgage note receivable	[1]	$ 0	$ 87,692
[1]	On January 30, 2015 the mortgage note was repaid. For further information regarding the mortgage note, see Note 2, "Summary of Significant Accounting Policies," included in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2014

Fair Value of Financial Instr45

Fair Value of Financial Instruments (Details Textuals) (Details)	6 Months Ended
	Jun. 30, 2015
Variable rate and mortgage debt [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Weighted average discount rate	4.50%

Limited Partners' Non-Control46

Limited Partners' Non-Controlling Interests in the Parent Company (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Noncontrolling Interest [Abstract]
Aggregate amount related to non-controlling interests classified within equity	$ 17.1	$ 17.5
Settlement value of non controlling interest in operating partnership	$ 20.4	$ 24.5

Beneficiaries Equity of the P47

Beneficiaries Equity of the Parent Company (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Numerator
Income (Loss) from continuing operations, Basic	$ 3,058	$ 1,245	$ 11,652	$ (992)
Income (Loss) from continuing operations, Diluted	3,058	1,245	11,652	(992)
Net (income) loss from continuing operations attributable to non-controlling interests - LP units, basic	(7)	5	(65)	49
Net (income) loss from continuing operations attributable to non-controlling interests - LP Units, diluted	(7)	5	(65)	49
Net loss attributable to non-controlling interest — partners' share of consolidated real estate ventures, Basic	5	24	5	12
Net loss attributable to non-controlling interest — partners' share of consolidated real estate ventures, Diluted	5	24	5	12
Nonforfeitable dividends allocated to unvested restricted shareholders, Basic	(76)	(83)	(177)	(186)
Nonforfeitable dividends allocated to unvested restricted shareholders, Diluted	(76)	(83)	(177)	(186)
Preferred share/unit dividends, Basic	(1,725)	(1,725)	(3,450)	(3,450)
Preferred share/unit dividends, Diluted	(1,725)	(1,725)	(3,450)	(3,450)
Income (Loss) from continuing operations available to common unitholders, Basic	1,255	(534)	7,965	(4,567)
Income (Loss) from continuing operations available to common unitholders, Diluted	1,255	(534)	7,965	(4,567)
Income (loss) from discontinued operations, Basic	0	929	0	921
Income (loss) from discontinued operations, Diluted	0	929	0	921
Discontinued operations attributable to non-controlling interests, basic	0	(10)	0	(10)
Discontinued operations attributable to common shareholders, diluted	0	(10)	0	(10)
Discontinued operations attributable to common shareholders, Basic	0	919	0	911
Discontinued operations attributable to common shareholders, Diluted	0	919	0	911
Net income (loss) attributable to Common Shareholders of Brandywine Realty Trust	1,255	385	7,965	(3,656)
Net Income (Loss) Available to Common Shareholders/unitholders, Diluted	$ 1,255	$ 385	$ 7,965	$ (3,656)
Denominator
Basic weighted average shares outstanding (in shares)	179,860,284	157,037,348	179,712,428	156,916,356
Contingent securities/Share based compensation (in shares)	678,603	0	886,837	0
Diluted weighted average shares outstanding (in shares)	180,538,887	157,037,348	180,599,265	156,916,356
Earnings per common share from continuing operations Abstract
Income (loss) from continuing operations attributable to common shareholders, Basic (USD per share)	$ 0.01	$ 0	$ 0.04	$ (0.03)
Income (loss) from continuing operations attributable to common shareholders, Dilued (USD per share)	0.01	0	0.04	(0.03)
Discontinued operations attributable to common shareholders, Basic (USD per share)	0	0	0	0.01
Discontinued operations attributable to common shareholders, Diluted (USD per share)	0	0	0	0.01
Net income (loss) attributable to common shareholders, Basic (USD per share)	0.01	0	0.04	(0.02)
Net income (loss) attributable to common shareholders, Diluted (USD per share)	$ 0.01	$ 0	$ 0.04	$ (0.02)

Beneficiaries Equity of the P48

Beneficiaries Equity of the Parent Company (Details Textuals) (Details) - USD ($) $ / shares in Units, $ in Thousands	Jul. 15, 2015	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014	Jul. 20, 2015	May. 28, 2015	Nov. 05, 2013
Class of Stock [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share		1,535,102	1,763,739
Distributions Payable		$ 29,021		$ 28,871
Preferred Stock, Dividend Rate, Percentage		6.90%		6.90%
Dividends, Preferred Stock, Cash		$ 3,450	$ 3,450
Series E Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Dividend Rate, Percentage		6.90%
Preferred Stock, Liquidation Preference Per Share		$ 25
Offering Program [Member]
Class of Stock [Line Items]
Shares Authorized For Equity Offering Program							16,000,000
Remaining Shares Available For Sales		16,000,000
Dividend Declared [Member]
Class of Stock [Line Items]
Dividends Payable, Amount Per Share						$ 0.15
Dividend Paid [Member] | Subsequent Event [Member]
Class of Stock [Line Items]
Distributions Payable					$ 27,300
Dividend Paid [Member] | Subsequent Event [Member] | Series E Preferred Stock [Member]
Class of Stock [Line Items]
Dividends, Preferred Stock, Cash	$ 1,700
Maximum [Member]
Class of Stock [Line Items]
Fees and Commissions Percentage		2.00%

Partners Equity of the Operat49

Partners Equity of the Operating Partnership (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Numerator
Income (Loss) from continuing operations, Basic	$ 3,058	$ 1,245	$ 11,652	$ (992)
Income (Loss) from continuing operations, Diluted	3,058	1,245	11,652	(992)
Nonforfeitable dividends allocated to unvested restricted shareholders, Basic	(76)	(83)	(177)	(186)
Nonforfeitable dividends allocated to unvested restricted shareholders, Diluted	(76)	(83)	(177)	(186)
Preferred share/unit dividends, Basic	(1,725)	(1,725)	(3,450)	(3,450)
Preferred share/unit dividends, Diluted	(1,725)	(1,725)	(3,450)	(3,450)
Net loss attributable to non-controlling interest — partners' share of consolidated real estate ventures	5	24	5	12
Net loss attributable to non-controlling interest — partners' share of consolidated real estate ventures, Diluted	5	24	5	12
Income (Loss) from continuing operations available to common unitholders, Basic	1,255	(534)	7,965	(4,567)
Income (Loss) from continuing operations available to common unitholders, Diluted	1,255	(534)	7,965	(4,567)
Income (loss) from discontinued operations, Basic	0	929	0	921
Net income (loss) attributable to Common Shareholders of Brandywine Realty Trust	1,255	385	7,965	(3,656)
Net Income (Loss) Available to Common Shareholders/unitholders, Diluted	$ 1,255	$ 385	$ 7,965	$ (3,656)
Denominator
Weighted-average units outstanding, Basic (in shares)	179,860,284	157,037,348	179,712,428	156,916,356
Contingent securities/Share based compensation (in shares)	678,603	0	886,837	0
Diluted weighted average shares outstanding (in shares)	180,538,887	157,037,348	180,599,265	156,916,356
Earnings per Common Partnership Unit:
Income (loss) from continuing operations attributable to common shareholders, Basic (USD per share)	$ 0.01	$ 0	$ 0.04	$ (0.03)
Income (loss) from continuing operations attributable to common shareholders, Dilued (USD per share)	0.01	0	0.04	(0.03)
Discontinued operations attributable to common shareholders, Basic (USD per share)	0	0	0	0.01
Discontinued operations attributable to common shareholders, Diluted (USD per share)	0	0	0	0.01
Net income (loss) attributable to common shareholders, Basic (USD per share)	0.01	0	0.04	(0.02)
Net income (loss) attributable to common shareholders, Diluted (USD per share)	$ 0.01	$ 0	$ 0.04	$ (0.02)
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Numerator
Income (Loss) from continuing operations, Basic	$ 3,058	$ 1,245	$ 11,652	$ (992)
Income (Loss) from continuing operations, Diluted	3,058	1,245	11,652	(992)
Nonforfeitable dividends allocated to unvested restricted shareholders, Basic	(76)	(83)	(177)	(186)
Nonforfeitable dividends allocated to unvested restricted shareholders, Diluted	(76)	(83)	(177)	(186)
Preferred share/unit dividends, Basic	(1,725)	(1,725)	(3,450)	(3,450)
Preferred share/unit dividends, Diluted	(1,725)	(1,725)	(3,450)	(3,450)
Net loss attributable to non-controlling interest — partners' share of consolidated real estate ventures	5	24	5	12
Net loss attributable to non-controlling interest — partners' share of consolidated real estate ventures, Diluted	5	24	5	12
Income (Loss) from continuing operations available to common unitholders, Basic	1,262	(539)	8,030	(4,616)
Income (Loss) from continuing operations available to common unitholders, Diluted	1,262	(539)	8,030	(4,616)
Income (loss) from discontinued operations, Basic	0	929	0	921
Income (Loss) From Discontinued Operations, Diluted	0	929	0	921
Net income (loss) attributable to Common Shareholders of Brandywine Realty Trust	1,262	390	8,030	(3,695)
Net Income (Loss) Available to Common Shareholders/unitholders, Diluted	$ 1,262	$ 390	$ 8,030	$ (3,695)
Denominator
Weighted-average units outstanding, Basic (in shares)	181,395,386	158,801,087	181,247,530	158,680,095
Contingent securities/Share based compensation (in shares)	678,603	0	886,837	0
Diluted weighted average shares outstanding (in shares)	182,073,989	158,801,087	182,134,367	158,680,095
Earnings per Common Partnership Unit:
Income (loss) from continuing operations attributable to common shareholders, Basic (USD per share)	$ 0.01	$ 0	$ 0.04	$ (0.03)
Income (loss) from continuing operations attributable to common shareholders, Dilued (USD per share)	0.01	0	0.04	(0.03)
Discontinued operations attributable to common shareholders, Basic (USD per share)	0	0	0	0.01
Discontinued operations attributable to common shareholders, Diluted (USD per share)	0	0	0	0.01
Net income (loss) attributable to common shareholders, Basic (USD per share)	0.01	0	0.04	(0.02)
Net income (loss) attributable to common shareholders, Diluted (USD per share)	$ 0.01	$ 0	$ 0.04	$ (0.02)

Partners Equity of the Operat50

Partners Equity of the Operating Partnership Partners Equity of the Operating Partnership (Details Textuals) (Details) - USD ($) $ / shares in Units, $ in Thousands	Jul. 15, 2015	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014	Jul. 20, 2015	May. 28, 2015
Earnings per Common Partnership Unit [Line Items]
Distributions Payable		$ 29,021		$ 28,871
Preferred Stock, Dividend Rate, Percentage		6.90%		6.90%
Dividends, Preferred Stock, Cash		$ 3,450	$ 3,450
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Earnings per Common Partnership Unit [Line Items]
Distributions Payable		$ 29,021		$ 28,871
Preferred Stock, Dividend Rate, Percentage		6.90%		6.90%
6.90% Series E-linked Preferred Units [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P.
Earnings per Common Partnership Unit [Line Items]
Preferred Stock, Dividend Rate, Percentage		6.90%
Preferred Stock, Liquidation Preference Per Share		$ 25
Dividend Paid [Member] | Subsequent Event [Member]
Earnings per Common Partnership Unit [Line Items]
Distributions Payable					$ 27,300
Dividend Paid [Member] | Subsequent Event [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P.
Earnings per Common Partnership Unit [Line Items]
Distributions Payable					$ 27,300
Dividend Paid [Member] | Subsequent Event [Member] | 6.90% Series E-linked Preferred Units [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P.
Earnings per Common Partnership Unit [Line Items]
Dividends, Preferred Stock, Cash	$ 1,700
Dividend Declared [Member]
Earnings per Common Partnership Unit [Line Items]
Dividends Payable, Amount Per Share						$ 0.15
Dividend Declared [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P.
Earnings per Common Partnership Unit [Line Items]
Dividends Payable, Amount Per Share						$ 0.15

Segment Information Segment Inf

Segment Information Segment Information Textual (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2015USD ($)propertysegment	Jun. 22, 2015	Dec. 31, 2014USD ($)property
Segment Reporting Information [Line Items]
Number of Reportable Segments | segment	7
Number of Properties	9
Investment in Real Estate Ventures, at equity | $	$ 201,034		$ 225,004
Coppell Associates [Member]
Segment Reporting Information [Line Items]
Investment in Real Estate Ventures, at equity | $	$ (1,200)		$ (1,200)
Durham, NC [Member]
Segment Reporting Information [Line Items]
Number of Properties	1
1000 Atrium Way and Libertyview [Member]
Segment Reporting Information [Line Items]
Number of Properties			2
Broadmoor Austin Associates [Member]
Segment Reporting Information [Line Items]
Ownership percentage		50.00%

Segment Information Summary of

Segment Information Summary of Real Estate Investments (Details) - USD ($) $ in Thousands		Jun. 30, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Operating properties		$ 4,700,839	$ 4,603,692
Less: Assets held for sale	[1]	0	27,436
Construction-in-progress		263,772	201,360
Land inventory		119,995	90,603
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating properties		4,700,839	4,603,692
Operating Segments [Member] | Philadelphia CBD [Member]
Segment Reporting Information [Line Items]
Operating properties		1,386,017	1,338,655
Operating Segments [Member] | Pennsylvania [Member]
Segment Reporting Information [Line Items]
Operating properties		1,180,974	1,178,470
Operating Segments [Member] | Metropolitan Dc [Member]
Segment Reporting Information [Line Items]
Operating properties		1,211,886	1,183,652
Operating Segments [Member] | New Jersey/ Delaware [Member]
Segment Reporting Information [Line Items]
Operating properties	[2]	330,051	392,581
Operating Segments [Member] | Richmond, Virginia [Member]
Segment Reporting Information [Line Items]
Operating properties		310,648	317,076
Operating Segments [Member] | California
Segment Reporting Information [Line Items]
Operating properties		119,360	193,258
Operating Segments [Member] | Austin, Texas [Member]
Segment Reporting Information [Line Items]
Operating properties	[3]	161,903	0
Operating Segments [Member] | Assets Held-for-sale [Member]
Segment Reporting Information [Line Items]
Less: Assets held for sale	[2]	0	27,436
Operating Segments [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating properties		4,700,839	4,631,128
Operating Segments [Member] | Corporate Segment [Member]
Segment Reporting Information [Line Items]
Construction-in-progress		263,772	201,360
Land inventory		$ 119,995	$ 90,603
[1]	Real estate investments related to assets held for sale above represents gross real estate assets and does not include accumulated depreciation or other assets on the balance sheets of the properties held for sale.
[2]	On December 31, 2014, the Company was actively marketing for sale its Atrium I and Libertyview properties, comprised of two office properties located in the New Jersey/Delaware segment. As of December 31, 2014 the properties were classified as held for sale on the consolidated balance sheet. The properties were sold on January 8, 2015. See Note 3, "Real Estate Investments," for further information. The sale is not classified as a significant disposition under the accounting guidance for discontinued operations.
[3]	On June 22, 2015 the Company acquired the remaining 50.0% of the common interest in Broadmoor Austin Associates. As such, the Company has seven wholly owned properties in its Austin, Texas business segment at June 30, 2015. See Note 3, "Real Estate Investments," for further information regarding this transaction.

Segment Information Summary o53

Segment Information Summary of Net Operating Income (Details) - USD ($) $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2015		Jun. 30, 2014		Jun. 30, 2015		Jun. 30, 2014
Segment Reporting Information [Line Items]
Total revenue		$ 145,648		$ 150,500		$ 296,054		$ 302,614
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenue		145,648		150,500		296,054		302,614
Operating expenses	[1]	(56,349)		(57,707)		(117,047)		(119,681)
Net operating income (loss)		89,299		92,793		179,007		182,933
Operating Segments [Member] | Philadelphia CBD [Member]
Segment Reporting Information [Line Items]
Total revenue		52,420		51,420		105,393		100,834
Operating expenses	[1]	(19,448)		(18,789)		(37,838)		(37,231)
Net operating income (loss)		32,972		32,631		67,555		63,603
Operating Segments [Member] | Pennsylvania [Member]
Segment Reporting Information [Line Items]
Total revenue		39,010		40,743		78,900		81,317
Operating expenses	[1]	(12,856)		(13,742)		(27,441)		(28,431)
Net operating income (loss)		26,154		27,001		51,459		52,886
Operating Segments [Member] | Metropolitan Dc [Member]
Segment Reporting Information [Line Items]
Total revenue		26,953		28,949		54,359		59,639
Operating expenses	[1]	(10,544)		(10,505)		(22,404)		(22,462)
Net operating income (loss)		16,409		18,444		31,955		37,177
Operating Segments [Member] | New Jersey/ Delaware [Member]
Segment Reporting Information [Line Items]
Total revenue		11,727		14,841		25,226		30,466
Operating expenses	[1]	(6,203)		(7,531)		(14,071)		(16,223)
Net operating income (loss)		5,524		7,310		11,155		14,243
Operating Segments [Member] | Richmond, Virginia [Member]
Segment Reporting Information [Line Items]
Total revenue		8,956		8,322		18,251		17,189
Operating expenses	[1]	(3,632)		(3,566)		(7,904)		(7,906)
Net operating income (loss)		5,324		4,756		10,347		9,283
Operating Segments [Member] | California
Segment Reporting Information [Line Items]
Total revenue		3,391		4,895		8,376		9,497
Operating expenses	[1]	(1,572)		(2,515)		(4,010)		(4,923)
Net operating income (loss)		1,819		2,380		4,366		4,574
Operating Segments [Member] | Austin, Texas [Member]
Segment Reporting Information [Line Items]
Total revenue		2,533	[2]	976	[2]	3,467	[1]	3,057	[1]
Operating expenses	[1]	(1,498)	[2]	(617)	[2]	(2,369)		(1,793)
Net operating income (loss)		1,035	[2]	359	[2]	1,098	[1]	1,264	[1]
Operating Segments [Member] | Corporate Segment [Member]
Segment Reporting Information [Line Items]
Total revenue		658		354		2,082		615
Operating expenses	[1]	(596)		(442)		(1,010)		(712)
Net operating income (loss)		$ 62		$ (88)		$ 1,072		$ (97)
[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% of the common interest in Broadmoor Austin Associates. See Note 3, "Real Estate Investments," for further information regarding this transaction. On April 3, 2014, the Company contributed Four Points Centre to an unconsolidated real estate venture. See Note 3, "Real Estate Investments," in notes to the audited financial statements included in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2014.

Segment Information Summary o54

Segment Information Summary of Unconsolidated Real Estate Ventures (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Investment in Real Estate Ventures, at equity		$ 201,034		$ 201,034		$ 225,004
Equity in loss of Real Estate Ventures		(873)	$ (489)	(742)	$ (247)
Operating Segments [Member]
Segment Reporting Information [Line Items]
Investment in Real Estate Ventures, at equity		201,034		201,034		225,004
Equity in loss of Real Estate Ventures		(873)	(489)	(742)	(247)
Operating Segments [Member] | Philadelphia CBD [Member]
Segment Reporting Information [Line Items]
Investment in Real Estate Ventures, at equity	[1]	33,961		33,961		27,137
Equity in loss of Real Estate Ventures	[1]	(150)	0	(450)	(21)
Operating Segments [Member] | Pennsylvania [Member]
Segment Reporting Information [Line Items]
Investment in Real Estate Ventures, at equity		17,220		17,220		17,385
Equity in loss of Real Estate Ventures		(17)	(391)	(22)	(359)
Operating Segments [Member] | Metropolitan Dc [Member]
Segment Reporting Information [Line Items]
Investment in Real Estate Ventures, at equity		109,249		109,249		73,127
Equity in loss of Real Estate Ventures		(179)	(42)	(229)	25
Operating Segments [Member] | New Jersey/ Delaware [Member]
Segment Reporting Information [Line Items]
Investment in Real Estate Ventures, at equity		0		0		0
Equity in loss of Real Estate Ventures		116	103	164	122
Operating Segments [Member] | Richmond, Virginia [Member]
Segment Reporting Information [Line Items]
Investment in Real Estate Ventures, at equity		1,506		1,506		1,574
Equity in loss of Real Estate Ventures		246	115	331	69
Operating Segments [Member] | Austin, Texas [Member]
Segment Reporting Information [Line Items]
Investment in Real Estate Ventures, at equity	[2],[3]	39,098		39,098		$ 105,781
Equity in loss of Real Estate Ventures	[2],[3]	$ (889)	$ (274)	$ (536)	$ (83)
[1]	Equity in income as of June 30, 2014 did not include evo at Cira, which was placed into service during the third quarter ended September 30, 2014.
[2]	Investment in real estate ventures does not include the $1.2 million negative investment balance in one real estate venture as of June 30, 2015 and December 31, 2014, which is included in other liabilities.
[3]	On June 22, 2015 the Company acquired the remaining 50.0% of the common interest in Broadmoor Austin Associates. As such, equity method investment at June 30, 2015 related to the Austin Venture only. See Note 3, "Real Estate Investments," for further information regarding the purchase of Broadmoor Austin Associates.

Segment Information (Reconcilia

Segment Information (Reconciliation of Consolidated Net Operating Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015		Jun. 30, 2014
Other income (expense):
Depreciation and amortization	$ (50,930)	$ (52,587)	$ (102,041)		$ (105,157)
General and administrative expenses	(6,791)	(6,005)	(15,427)		(14,186)
Interest income	313	385	1,063		770
Interest expense	(27,895)	(31,512)	(56,071)		(63,356)
Interest expense — amortization of deferred financing costs	(1,288)	(1,197)	(2,367)		(2,386)
Interest expense — financing obligation	(324)	(316)	(610)		(588)
Equity in loss of Real Estate Ventures	(873)	(489)	(742)		(247)
Net gain on disposition of real estate	1,571	0	10,590	[1]	0
Net gain (loss) on sale of undepreciated real estate	0	(3)	0		1,184
Net gain from remeasurement of investments in real estate ventures	758	458	758		458
Loss on real estate venture transactions	0	(282)	0		(417)
Provision for impairment on assets held for sale/sold	(782)	0	(2,508)		0
Income (Loss) from continuing operations	3,058	1,245	11,652		(992)
Total discontinued operations	0	929	0		921
Net income	3,058	2,174	11,652		(71)
Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated net operating income	89,299	92,793	179,007		182,933
Other income (expense):
Depreciation and amortization	(50,930)	(52,587)	(102,041)		(105,157)
General and administrative expenses	(6,791)	(6,005)	(15,427)		(14,186)
Interest income	313	385	1,063		770
Interest expense	(27,895)	(31,512)	(56,071)		(63,356)
Interest expense — amortization of deferred financing costs	(1,288)	(1,197)	(2,367)		(2,386)
Interest expense — financing obligation	(324)	(316)	(610)		(588)
Equity in loss of Real Estate Ventures	(873)	(489)	(742)		(247)
Net gain on disposition of real estate	1,571	0	10,590		0
Net gain (loss) on sale of undepreciated real estate	0	(3)	0		1,184
Net gain from remeasurement of investments in real estate ventures	758	458	758		458
Loss on real estate venture transactions	0	(282)	0		(417)
Provision for impairment on assets held for sale/sold	(782)	0	(2,508)		0
Income (Loss) from continuing operations	3,058	1,245	11,652		(992)
Total discontinued operations	0	929	0		921
Net income	$ 3,058	$ 2,174	$ 11,652		$ (71)
[1]	Gain/(Loss) on Sale is net of closing and other transaction related costs.

Commitments and Contingencies56

Commitments and Contingencies (Details) - Jun. 30, 2015 - USD ($) $ in Millions	Total
Minimum [Member]
Property Subject to or Available for Operating Lease [Line Items]
Lease terms	6 years
Maximum [Member]
Property Subject to or Available for Operating Lease [Line Items]
Lease terms	74 years
Put Option [Member]
Property Subject to or Available for Operating Lease [Line Items]
Purchase price	$ 35

Commitments and Contingencies57

Commitments and Contingencies (Ground Rent) (Details) - Ground Rent [Member] $ in Thousands	Jun. 30, 2015USD ($)
Long-term Purchase Commitment [Line Items]
2015 (six months remaining)	$ 693
2,016	1,385
2,017	1,385
2,018	1,385
2,019	1,385
Thereafter	68,648
Total	$ 74,881

Subsequent Events (Details)

Subsequent Events (Details) - Subsequent Event [Member]	Jul. 07, 2015USD ($)a	Jul. 22, 2015USD ($)
Subsequent Event [Line Items]
Authorized Amount		$ 100,000,000
2100 Market Street [Member]
Subsequent Event [Line Items]
Area owned by company of undeveloped parcels of land | a	0.8
Payments to Acquire Land	$ 18,800,000
Amount funded by corporate funds	16,800,000
Amount deferred	$ 2,000,000
Settlement period	24 months