Brandywine Operating Partnership 10-Q29 Jul 222022 Q2 Quarterly reportFinancial data

Company Profile

Cover Page

Cover Page - shares	6 Months Ended
Cover Page - shares	Jun. 30, 2022	Jul. 25, 2022
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2022
Document Transition Report	false
Entity Registrant Name	Brandywine Realty Trust
Entity Incorporation, State or Country Code	MD
Entity File Number	001-9106
Entity Tax Identification Number	23-2413352
Entity Address, Address Line One	2929 Arch Street
Entity Address, Address Line Two	Suite 1800
Entity Address, City or Town	Philadelphia
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	19104
City Area Code	610
Local Phone Number	325-5600
Title of 12(b) Security	Common Shares of Beneficial Interest
Trading Symbol	BDN
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		171,569,807
Entity Central Index Key	0000790816
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q2
Amendment Flag	false
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Document Information [Line Items]
Entity Registrant Name	Brandywine Operating Partnership, L.P.
Entity Incorporation, State or Country Code	DE
Entity File Number	000-24407
Entity Tax Identification Number	23-2862640
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Central Index Key	0001060386

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Real estate investments:
Operating properties	$ 3,545,102	$ 3,472,602
Accumulated depreciation	(1,009,108)	(957,450)
Right of use asset - operating leases, net	19,988	20,313
Operating real estate investments, net	2,555,982	2,535,465
Construction-in-progress	366,823	277,237
Land held for development	93,887	114,604
Prepaid leasehold interests in land held for development, net	35,576	27,762
Total real estate investments, net	3,052,268	2,955,068
Assets held for sale, net	0	562
Cash and cash equivalents	28,849	27,463
Accounts receivable	13,584	11,875
Accrued rent receivable, net of allowance of $4,049 and $4,133 as of June 30, 2022 and December 31, 2021, respectively	172,076	167,210
Investment in unconsolidated real estate ventures	458,840	435,506
Deferred costs, net	93,570	86,862
Intangible assets, net	23,015	28,556
Other assets	124,486	133,094
Total assets	3,966,688	3,846,196
LIABILITIES AND BENEFICIARIES' EQUITY
Unsecured credit facility	214,000	23,000
Unsecured term loan, net	248,047	249,608
Unsecured senior notes, net	1,580,712	1,580,978
Accounts payable and accrued expenses	131,669	150,151
Distributions payable	32,800	32,765
Deferred income, gains and rent	21,195	23,849
Intangible liabilities, net	11,277	12,981
Lease liability - operating leases	23,066	22,962
Other liabilities	52,359	48,683
Total liabilities	2,315,125	2,144,977
Commitments and contingencies (See Note 14)
Brandywine Realty Trust's Equity:
Common Shares of Brandywine Realty Trust's beneficial interest, $0.01 par value; shares authorized 400,000,000; 171,575,280 and 171,126,257 issued and outstanding as of June 30, 2022 and December 31, 2021, respectively	1,716	1,712
Additional paid-in-capital	3,149,146	3,146,786
Deferred compensation payable in common shares	19,601	18,491
Common shares in grantor trust, 1,202,385 and 1,169,703 issued and outstanding as of June 30, 2022 and December 31, 2021, respectively	(19,601)	(18,491)
Cumulative earnings	1,133,102	1,122,372
Accumulated other comprehensive income (loss)	3,849	(2,020)
Cumulative distributions	(2,643,999)	(2,578,583)
Total Brandywine Realty Trust's equity	1,643,814	1,690,267
Noncontrolling interests	7,749	10,952
Total beneficiaries' equity	1,651,563	1,701,219
Total liabilities and beneficiaries' equity	$ 3,966,688	$ 3,846,196

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenue
Total revenue	$ 124,042	$ 120,102	$ 251,547	$ 240,871
Operating expenses
Property operating expenses	33,111	29,264	64,659	58,199
Real estate taxes	13,746	14,602	27,559	29,363
Third party management expenses	2,792	3,561	5,349	6,539
Depreciation and amortization	43,959	42,785	87,741	83,128
General and administrative expenses	8,328	8,356	18,328	14,940
Total operating expenses	101,936	98,568	203,636	192,169
Gain on sale of real estate
Net gain on disposition of real estate	144	68	144	142
Net gain on sale of undepreciated real estate	4,127	0	5,024	1,993
Total gain on sale of real estate	4,271	68	5,168	2,135
Operating income	26,377	21,602	53,079	50,837
Other income (expense):
Interest and investment income	449	1,677	889	3,351
Interest expense	(16,341)	(15,490)	(32,083)	(31,783)
Interest expense - amortization of deferred financing costs	(805)	(709)	(1,514)	(1,418)
Equity in loss of unconsolidated real estate ventures	(4,981)	(7,240)	(9,544)	(14,164)
Net income (loss) before income taxes	4,699	(160)	10,827	6,823
Income tax provision	(48)	(15)	(75)	(34)
Net income (loss)	4,651	(175)	10,752	6,789
Net (income) loss attributable to noncontrolling interests	(14)	8	(22)	(35)
Net income (loss) attributable to Brandywine Realty Trust	4,637	(167)	10,730	6,754
Nonforfeitable dividends allocated to unvested restricted shareholders	(98)	(94)	(246)	(240)
Net income (loss) attributable to Common Partnership Unitholders of Brandywine Operating Partnership, L.P.	$ 4,539	$ (261)	$ 10,484	$ 6,514
Basic income per Common Share (in dollars per share)	$ 0.03	$ 0	$ 0.06	$ 0.04
Diluted income per Common Share (in dollars per share)	$ 0.03	$ 0	$ 0.06	$ 0.04
Basic weighted average shares outstanding (in shares)	171,527,031	170,848,894	171,411,631	170,737,437
Weighted average units outstanding, diluted (in shares)	172,260,429	170,848,894	172,575,408	171,996,119
Rents
Revenue
Total revenue	$ 116,897	$ 111,235	$ 232,798	$ 224,719
Third party management fees, labor reimbursement and leasing
Revenue
Total revenue	5,924	6,627	11,032	13,278
Other
Revenue
Total revenue	$ 1,221	$ 2,240	$ 7,717	$ 2,874

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income (loss)		$ 4,651	$ 6,101	$ (175)	$ 6,964	$ 10,752	$ 6,789
Comprehensive income:
Unrealized gain on derivative financial instruments		1,747		860		5,511	1,770
Amortization of interest rate contracts	[1]	188		188		376	376
Total comprehensive income		1,935	$ 3,952	1,048	$ 1,098	5,887	2,146
Comprehensive income		6,586		873		16,639	8,935
Comprehensive (income) loss attributable to noncontrolling interest		(20)		2		(40)	(47)
Comprehensive income attributable to Brandywine Realty Trust		$ 6,566		$ 875		$ 16,599	$ 8,888

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

CONSOLIDATED STATEMENTS OF BENE

CONSOLIDATED STATEMENTS OF BENEFICIARIES’ EQUITY - USD ($) $ in Thousands	Total	Common Stock	Rabbi Trust/Deferred Compensation Shares	Additional Paid-in Capital	Common Shares in Grantor Trust	Cumulative Earnings	Accumulated Other Comprehensive Income (Loss)	Cumulative Distributions	Noncontrolling Interests
Beginning balance (in shares) at Dec. 31, 2020		170,572,964	1,160,494
Beginning balance at Dec. 31, 2020	$ 1,804,648	$ 1,707	$ 17,516	$ 3,138,152	$ (17,516)	$ 1,110,083	$ (7,561)	$ (2,448,238)	$ 10,505
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	6,964					6,921			43
Other comprehensive income	1,098						1,092		6
Share-based compensation activity (in shares)		108,345	12,719
Share-based compensation activity	2,502			2,502
Share Issuance from/(to) Deferred Compensation Plan (in shares)		(18,058)	(61,436)
Share Issuance from/(to) Deferred Compensation Plan	(198)		$ 142	(198)	(142)
Distributions declared	(32,760)							(32,573)	(187)
Ending balance (in shares) at Mar. 31, 2021		170,663,251	1,111,777
Ending balance at Mar. 31, 2021	1,782,254	$ 1,707	$ 17,658	3,140,456	(17,658)	1,117,004	(6,469)	(2,480,811)	10,367
Beginning balance (in shares) at Dec. 31, 2020		170,572,964	1,160,494
Beginning balance at Dec. 31, 2020	1,804,648	$ 1,707	$ 17,516	3,138,152	(17,516)	1,110,083	(7,561)	(2,448,238)	10,505
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	6,789
Other comprehensive income	2,146
Ending balance (in shares) at Jun. 30, 2021		170,900,491	1,175,343
Ending balance at Jun. 30, 2021	1,751,053	$ 1,709	$ 18,491	3,140,575	(18,491)	1,116,837	(5,427)	(2,513,373)	10,732
Beginning balance (in shares) at Mar. 31, 2021		170,663,251	1,111,777
Beginning balance at Mar. 31, 2021	1,782,254	$ 1,707	$ 17,658	3,140,456	(17,658)	1,117,004	(6,469)	(2,480,811)	10,367
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(175)					(167)			(8)
Other comprehensive income	1,048						1,042		6
Issuance of partnership interest in consolidated real estate ventures	2,289								2,289
Redemption of LP Units	(2,334)								(2,334)
Share-based compensation activity (in shares)		237,240	63,566
Share-based compensation activity	690	$ 2		688
Share Issuance from/(to) Deferred Compensation Plan	0		$ 833		(833)
Reallocation of Noncontrolling interest	0			(569)					569
Distributions declared	(32,719)							(32,562)	(157)
Ending balance (in shares) at Jun. 30, 2021		170,900,491	1,175,343
Ending balance at Jun. 30, 2021	1,751,053	$ 1,709	$ 18,491	3,140,575	(18,491)	1,116,837	(5,427)	(2,513,373)	10,732
Beginning balance (in shares) at Dec. 31, 2021		171,126,257	1,169,703
Beginning balance at Dec. 31, 2021	1,701,219	$ 1,712	$ 18,491	3,146,786	(18,491)	1,122,372	(2,020)	(2,578,583)	10,952
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	6,101					6,093			8
Other comprehensive income	3,952						3,940		12
Redemption of LP Units	(4,006)								(4,006)
Share-based compensation activity (in shares)		277,061	68,540
Share-based compensation activity	1,655	$ 2		1,653
Share Issuance from/(to) Deferred Compensation Plan (in shares)		(19,406)	(52,702)
Share Issuance from/(to) Deferred Compensation Plan	(249)		$ 895	(249)	(895)
Reallocation of Noncontrolling interest	0			(959)					959
Distributions declared	(32,809)							(32,711)	(98)
Ending balance (in shares) at Mar. 31, 2022		171,383,912	1,185,541
Ending balance at Mar. 31, 2022	1,675,863	$ 1,714	$ 19,386	3,147,231	(19,386)	1,128,465	1,920	(2,611,294)	7,827
Beginning balance (in shares) at Dec. 31, 2021		171,126,257	1,169,703
Beginning balance at Dec. 31, 2021	1,701,219	$ 1,712	$ 18,491	3,146,786	(18,491)	1,122,372	(2,020)	(2,578,583)	10,952
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	10,752
Other comprehensive income	5,887
Ending balance (in shares) at Jun. 30, 2022		171,575,280	1,202,385
Ending balance at Jun. 30, 2022	1,651,563	$ 1,716	$ 19,601	3,149,146	(19,601)	1,133,102	3,849	(2,643,999)	7,749
Beginning balance (in shares) at Mar. 31, 2022		171,383,912	1,185,541
Beginning balance at Mar. 31, 2022	1,675,863	$ 1,714	$ 19,386	3,147,231	(19,386)	1,128,465	1,920	(2,611,294)	7,827
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	4,651					4,637			14
Other comprehensive income	1,935						1,929		6
Share-based compensation activity (in shares)		191,368	16,844
Share-based compensation activity	1,917	$ 2		1,915
Share Issuance from/(to) Deferred Compensation Plan (in shares)
Share Issuance from/(to) Deferred Compensation Plan	0		$ 215		(215)
Distributions declared	(32,803)							(32,705)	(98)
Ending balance (in shares) at Jun. 30, 2022		171,575,280	1,202,385
Ending balance at Jun. 30, 2022	$ 1,651,563	$ 1,716	$ 19,601	$ 3,149,146	$ (19,601)	$ 1,133,102	$ 3,849	$ (2,643,999)	$ 7,749

CONSOLIDATED STATEMENTS OF BE_2

CONSOLIDATED STATEMENTS OF BENEFICIARIES’ EQUITY (Parenthetical) - $ / shares		3 Months Ended
	May 18, 2022	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021
Statement of Stockholders' Equity [Abstract]
Distributions declared (in dollars per share)	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities:
Net income	$ 10,752	$ 6,789
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	87,741	83,128
Amortization of deferred financing costs	1,514	1,418
Amortization of debt discount/(premium), net	(975)	(975)
Amortization of stock compensation costs	5,419	4,324
Straight-line rent income	(5,042)	(7,472)
Amortization of acquired above (below) market leases, net	(1,664)	(2,573)
Ground rent expense	408	505
Provision for doubtful accounts	0	67
Total gain on sale of real estate	(5,168)	(2,135)
Loss from unconsolidated real estate ventures, net of distributions	9,544	14,164
Income tax provision	75	34
Changes in assets and liabilities:
Accounts receivable	(1,254)	2,513
Other assets	(2,711)	(2,405)
Accounts payable and accrued expenses	(19,484)	(12,431)
Deferred income, gains and rent	(2,487)	1,887
Other liabilities	1,826	(7,712)
Net cash provided by operating activities	78,494	79,126
Cash flows from investing activities:
Acquisition of properties	(3,446)	0
Proceeds from the sale of properties	34,146	79
Proceeds from insurance	0	1,250
Capital expenditures for tenant improvements	(35,545)	(20,573)
Capital expenditures for redevelopments	(56,472)	(10,005)
Capital expenditures for developments	(82,252)	(18,746)
Advances for the purchase of tenant assets, net of repayments	(447)	290
Investment in unconsolidated real estate ventures	(27,807)	(16,662)
Deposits for real estate	(7,550)	0
Capital distributions from unconsolidated real estate ventures	5,720	5,151
Leasing costs paid	(15,209)	(9,187)
Net cash used in investing activities	(188,862)	(68,403)
Cash flows from financing activities:
Proceeds from credit facility borrowings	196,000	96,000
Repayments of credit facility borrowings	(5,000)	(38,000)
Debt financing costs paid	(6,641)	0
Exercise of stock options, net	0	(63)
Shares used for employee taxes upon vesting of share awards	(2,935)	(1,823)
Partner contributions to consolidated real estate venture	0	2,289
Redemption of limited partnership units	(4,006)	(2,234)
Distributions paid to shareholders	(65,315)	(65,074)
Distributions to noncontrolling interest	(255)	(383)
Net cash provided by (used in) financing activities	111,848	(9,288)
Increase in cash and cash equivalents and restricted cash	1,480	1,435
Cash and cash equivalents and restricted cash at beginning of period	28,300	47,077
Cash and cash equivalents and restricted cash at end of period	29,780	48,512
Reconciliation of cash and cash equivalents and restricted cash:
Cash and cash equivalents, beginning of period	27,463	46,344
Restricted cash, beginning of period	837	733
Cash and cash equivalents, end of period	28,849	47,730
Restricted cash, end of period	931	782
Cash and cash equivalents and restricted cash, end of period	29,780	48,512
Supplemental disclosure:
Cash paid for interest, net of capitalized interest during the six months ended June 30, 2022 and 2021 of $4,442 and $3,734, respectively	37,961	36,961
Cash paid for income taxes	902	21
Supplemental disclosure of non-cash activity:
Dividends and distributions declared but not paid	32,800	32,727
Change in investment in real estate ventures as a result of deconsolidation	0	32,761
Change in operating real estate from deconsolidation of operating properties	0	(30,073)
Change in other assets as a result of deconsolidation of operating properties	0	(2,688)
Change in other assets as a result of investing activities	13,396	0
Change in capital expenditures financed through accounts payable at period end	10,283	(653)
Change in capital expenditures financed through retention payable at period end	$ (1,097)	$ (2,339)

CONSOLIDATED STATEMENTS OF CA_2

CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Statement of Cash Flows [Abstract]
Capitalized interest	$ 4,442	$ 3,734

CONSOLIDATED BALANCE SHEETS - B

CONSOLIDATED BALANCE SHEETS - BRANDYWINE OPERATING PARTNERSHIP, L.P. - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Real estate investments:
Operating properties	$ 3,545,102	$ 3,472,602
Accumulated depreciation	(1,009,108)	(957,450)
Right of use asset - operating leases, net	19,988	20,313
Operating real estate investments, net	2,555,982	2,535,465
Construction-in-progress	366,823	277,237
Land held for development	93,887	114,604
Prepaid leasehold interests in land held for development, net	35,576	27,762
Total real estate investments, net	3,052,268	2,955,068
Assets held for sale, net	0	562
Cash and cash equivalents	28,849	27,463
Accounts receivable	13,584	11,875
Accrued rent receivable, net of allowance of $4,049 and $4,133 as of June 30, 2022 and December 31, 2021, respectively	172,076	167,210
Investment in unconsolidated real estate ventures	458,840	435,506
Deferred costs, net	93,570	86,862
Intangible assets, net	23,015	28,556
Other assets	124,486	133,094
Total assets	3,966,688	3,846,196
LIABILITIES AND BENEFICIARIES' EQUITY
Unsecured credit facility	214,000	23,000
Unsecured term loan, net	248,047	249,608
Unsecured senior notes, net	1,580,712	1,580,978
Accounts payable and accrued expenses	131,669	150,151
Distributions payable	32,800	32,765
Deferred income, gains and rent	21,195	23,849
Intangible liabilities, net	11,277	12,981
Lease liability - operating leases	23,066	22,962
Other liabilities	52,359	48,683
Total liabilities	2,315,125	2,144,977
Commitments and contingencies (See Note 14)
Brandywine Realty Trust's Equity:
Accumulated other comprehensive income (loss)	3,849	(2,020)
Total liabilities and beneficiaries' equity	3,966,688	3,846,196
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Real estate investments:
Operating properties	3,545,102	3,472,602
Accumulated depreciation	(1,009,108)	(957,450)
Right of use asset - operating leases, net	19,988	20,313
Operating real estate investments, net	2,555,982	2,535,465
Construction-in-progress	366,823	277,237
Land held for development	93,887	114,604
Prepaid leasehold interests in land held for development, net	35,576	27,762
Total real estate investments, net	3,052,268	2,955,068
Assets held for sale, net	0	562
Cash and cash equivalents	28,849	27,463
Accounts receivable	13,584	11,875
Accrued rent receivable, net of allowance of $4,049 and $4,133 as of June 30, 2022 and December 31, 2021, respectively	172,076	167,210
Investment in unconsolidated real estate ventures	458,840	435,506
Deferred costs, net	93,570	86,862
Intangible assets, net	23,015	28,556
Other assets	124,486	133,094
Total assets	3,966,688	3,846,196
LIABILITIES AND BENEFICIARIES' EQUITY
Unsecured credit facility	214,000	23,000
Unsecured term loan, net	248,047	249,608
Unsecured senior notes, net	1,580,712	1,580,978
Accounts payable and accrued expenses	131,669	150,151
Distributions payable	32,800	32,765
Deferred income, gains and rent	21,195	23,849
Intangible liabilities, net	11,277	12,981
Lease liability - operating leases	23,066	22,962
Other liabilities	52,359	48,683
Total liabilities	2,315,125	2,144,977
Commitments and contingencies (See Note 14)
Redeemable limited partnership units at redemption value; 516,467 and 823,983 issued and outstanding as of June 30, 2022 and December 31, 2021, respectively	5,059	11,140
Brandywine Realty Trust's Equity:
General Partnership Capital; 171,575,280 and 171,126,257 units issued and outstanding as of June 30, 2022 and December 31, 2021, respectively	1,640,153	1,689,611
Accumulated other comprehensive income (loss)	3,521	(2,366)
Total Brandywine Operating Partnership, L.P.'s equity	1,643,674	1,687,245
Noncontrolling interest - consolidated real estate ventures	2,830	2,834
Total partners' equity	1,646,504	1,690,079
Total liabilities and beneficiaries' equity	$ 3,966,688	$ 3,846,196

CONSOLIDATED BALANCE SHEETS -_2

CONSOLIDATED BALANCE SHEETS - BRANDYWINE OPERATING PARTNERSHIP, L.P. (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Accrued rent receivable, allowance	$ 4,049	$ 4,133
Common stock, shares issued (in shares)	171,575,280	171,126,257
Common stock, shares outstanding (in shares)	171,575,280	171,126,257
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Accrued rent receivable, allowance	$ 4,049	$ 4,133
Redeemable limited partnership units issued (in units)	516,467	823,983
Redeemable limited partnership units outstanding (in units)	516,467	823,983

CONSOLIDATED STATEMENTS OF OP_2

CONSOLIDATED STATEMENTS OF OPERATIONS - BRANDYWINE OPERATING PARTNERSHIP, L.P. - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenue
Total revenue	$ 124,042	$ 120,102	$ 251,547	$ 240,871
Operating expenses
Property operating expenses	33,111	29,264	64,659	58,199
Real estate taxes	13,746	14,602	27,559	29,363
Third party management expenses	2,792	3,561	5,349	6,539
Depreciation and amortization	43,959	42,785	87,741	83,128
General and administrative expenses	8,328	8,356	18,328	14,940
Total operating expenses	101,936	98,568	203,636	192,169
Gain on sale of real estate
Net gain on disposition of real estate	144	68	144	142
Net gain on sale of undepreciated real estate	4,127	0	5,024	1,993
Total gain on sale of real estate	4,271	68	5,168	2,135
Operating income	26,377	21,602	53,079	50,837
Other income (expense):
Interest and investment income	449	1,677	889	3,351
Interest expense	(16,341)	(15,490)	(32,083)	(31,783)
Interest expense - amortization of deferred financing costs	(805)	(709)	(1,514)	(1,418)
Equity in loss of unconsolidated real estate ventures	(4,981)	(7,240)	(9,544)	(14,164)
Net income (loss) before income taxes	4,699	(160)	10,827	6,823
Income tax provision	(48)	(15)	(75)	(34)
Net income (loss)	4,651	(175)	10,752	6,789
Nonforfeitable dividends allocated to unvested restricted shareholders	(98)	(94)	(246)	(240)
Net income (loss) attributable to Common Partnership Unitholders of Brandywine Operating Partnership, L.P.	$ 4,539	$ (261)	$ 10,484	$ 6,514
Basic income per Common Share (in dollars per share)	$ 0.03	$ 0	$ 0.06	$ 0.04
Diluted income per Common Share (in dollars per share)	$ 0.03	$ 0	$ 0.06	$ 0.04
Basic weighted average common partnership units outstanding (in shares)	171,527,031	170,848,894	171,411,631	170,737,437
Diluted weighted average common partnership units outstanding (in shares)	172,260,429	170,848,894	172,575,408	171,996,119
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Revenue
Total revenue	$ 124,042	$ 120,102	$ 251,547	$ 240,871
Operating expenses
Property operating expenses	33,111	29,264	64,659	58,199
Real estate taxes	13,746	14,602	27,559	29,363
Third party management expenses	2,792	3,561	5,349	6,539
Depreciation and amortization	43,959	42,785	87,741	83,128
General and administrative expenses	8,328	8,356	18,328	14,940
Total operating expenses	101,936	98,568	203,636	192,169
Gain on sale of real estate
Net gain on disposition of real estate	144	68	144	142
Net gain on sale of undepreciated real estate	4,127	0	5,024	1,993
Total gain on sale of real estate	4,271	68	5,168	2,135
Operating income	26,377	21,602	53,079	50,837
Other income (expense):
Interest and investment income	449	1,677	889	3,351
Interest expense	(16,341)	(15,490)	(32,083)	(31,783)
Interest expense - amortization of deferred financing costs	(805)	(709)	(1,514)	(1,418)
Equity in loss of unconsolidated real estate ventures	(4,981)	(7,240)	(9,544)	(14,164)
Net income (loss) before income taxes	4,699	(160)	10,827	6,823
Income tax provision	(48)	(15)	(75)	(34)
Net income (loss)	4,651	(175)	10,752	6,789
Net loss attributable to noncontrolling interests - consolidated real estate ventures	2	1	4	2
Net income (loss) attributable to Brandywine Operating Partnership	4,653	(174)	10,756	6,791
Nonforfeitable dividends allocated to unvested restricted shareholders	(98)	(94)	(246)	(240)
Net income (loss) attributable to Common Partnership Unitholders of Brandywine Operating Partnership, L.P.	$ 4,555	$ (268)	$ 10,510	$ 6,551
Basic income per Common Share (in dollars per share)	$ 0.03	$ 0	$ 0.06	$ 0.04
Diluted income per Common Share (in dollars per share)	$ 0.03	$ 0	$ 0.06	$ 0.04
Basic weighted average common partnership units outstanding (in shares)	172,043,498	171,792,415	171,985,863	171,699,909
Diluted weighted average common partnership units outstanding (in shares)	172,776,896	171,792,415	173,149,640	172,958,591
Rents
Revenue
Total revenue	$ 116,897	$ 111,235	$ 232,798	$ 224,719
Rents \| BRANDYWINE OPERATING PARTNERSHIP, L.P.
Revenue
Total revenue	116,897	111,235	232,798	224,719
Third party management fees, labor reimbursement and leasing
Revenue
Total revenue	5,924	6,627	11,032	13,278
Third party management fees, labor reimbursement and leasing \| BRANDYWINE OPERATING PARTNERSHIP, L.P.
Revenue
Total revenue	5,924	6,627	11,032	13,278
Other
Revenue
Total revenue	1,221	2,240	7,717	2,874
Other \| BRANDYWINE OPERATING PARTNERSHIP, L.P.
Revenue
Total revenue	$ 1,221	$ 2,240	$ 7,717	$ 2,874

CONSOLIDATED STATEMENTS OF CO_2

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - BRANDYWINE OPERATING PARTNERSHIP, L.P. - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Net income (loss)		$ 4,651	$ (175)	$ 10,752	$ 6,789
Comprehensive income:
Unrealized gain on derivative financial instruments		1,747	860	5,511	1,770
Amortization of interest rate contracts	[1]	188	188	376	376
Total comprehensive income		1,935	1,048	5,887	2,146
Comprehensive income		6,586	873	16,639	8,935
Comprehensive loss attributable to noncontrolling interest - consolidated real estate ventures		(20)	2	(40)	(47)
Comprehensive income attributable to Brandywine Realty Trust		6,566	875	16,599	8,888
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Net income (loss)		4,651	(175)	10,752	6,789
Comprehensive income:
Unrealized gain on derivative financial instruments		1,747	860	5,511	1,770
Amortization of interest rate contracts	[2]	188	188	376	376
Total comprehensive income		1,935	1,048	5,887	2,146
Comprehensive income		6,586	873	16,639	8,935
Comprehensive loss attributable to noncontrolling interest - consolidated real estate ventures		2	1	4	2
Comprehensive income attributable to Brandywine Realty Trust		$ 6,588	$ 874	$ 16,643	$ 8,937

[1]Amounts reclassified from comprehensive income to interest expense within the Consolidated Statements of Operations.[2]Amounts reclassified from comprehensive income to interest expense within the Consolidated Statements of Operations.

CONSOLIDATED STATEMENTS OF PART

CONSOLIDATED STATEMENTS OF PARTNERS’ EQUITY - USD ($) $ in Thousands	Total	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interest - Consolidated Real Estate Ventures	BRANDYWINE OPERATING PARTNERSHIP, L.P.	BRANDYWINE OPERATING PARTNERSHIP, L.P. Accumulated Other Comprehensive Income (Loss)	BRANDYWINE OPERATING PARTNERSHIP, L.P. Noncontrolling Interest - Consolidated Real Estate Ventures	BRANDYWINE OPERATING PARTNERSHIP, L.P. General Partner Capital
Beginning balance (in shares) at Dec. 31, 2020							170,572,964
Beginning Balance at Dec. 31, 2020				$ 1,793,082	$ (7,935)	$ 72	$ 1,800,945
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income (loss)	$ 6,964		$ 43	6,964		(1)	$ 6,965
Other comprehensive income	1,098	$ 1,092	6	1,098	1,098
Deferred compensation obligation (in shares)							(18,058)
Deferred compensation obligation	(198)			(198)			$ (198)
Share-based compensation activity (in shares)							108,345
Share-based compensation activity	2,502			2,502			$ 2,502
Adjustment of redeemable partnership units to liquidation value at period end				(1,294)			(1,294)
Distributions declared to general partnership unitholders				(32,573)			$ (32,573)
Ending balance (in shares) at Mar. 31, 2021							170,663,251
Ending Balance at Mar. 31, 2021				1,769,581	(6,837)	71	$ 1,776,347
Beginning balance (in shares) at Dec. 31, 2020							170,572,964
Beginning Balance at Dec. 31, 2020				1,793,082	(7,935)	72	$ 1,800,945
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income (loss)	6,789			6,789
Other comprehensive income	2,146			2,146
Ending balance (in shares) at Jun. 30, 2021							170,900,491
Ending Balance at Jun. 30, 2021				1,739,603	(5,789)	70	$ 1,745,322
Beginning balance (in shares) at Mar. 31, 2021							170,663,251
Beginning Balance at Mar. 31, 2021				1,769,581	(6,837)	71	$ 1,776,347
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income (loss)	(175)		(8)	(175)		(1)	(174)
Other comprehensive income	1,048	1,042	6	1,048	1,048
Deferred compensation obligation	0
Repurchase and retirement of LP units				(2,334)			(2,334)
Issuance of partnership interest in consolidated real estate ventures	2,289		2,289	2,289			$ 2,289
Share-based compensation activity (in shares)							237,240
Share-based compensation activity	690			690			$ 690
Adjustment of redeemable partnership units to liquidation value at period end				1,066			1,066
Distributions declared to general partnership unitholders				(32,562)			$ (32,562)
Ending balance (in shares) at Jun. 30, 2021							170,900,491
Ending Balance at Jun. 30, 2021				1,739,603	(5,789)	70	$ 1,745,322
Beginning balance (in shares) at Dec. 31, 2021							171,126,257
Beginning Balance at Dec. 31, 2021				1,690,079	(2,366)	2,834	$ 1,689,611
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income (loss)	6,101		8	6,101		(2)	$ 6,103
Other comprehensive income	3,952	3,940	12	3,952	3,952
Deferred compensation obligation (in shares)							(19,406)
Deferred compensation obligation	(249)			(249)			$ (249)
Repurchase and retirement of LP units				(4,006)			$ (4,006)
Share-based compensation activity (in shares)							277,061
Share-based compensation activity	1,655			1,655			$ 1,655
Adjustment of redeemable partnership units to liquidation value at period end				3,704			3,704
Distributions declared to general partnership unitholders				(32,711)			$ (32,711)
Ending balance (in shares) at Mar. 31, 2022							171,383,912
Ending Balance at Mar. 31, 2022				1,668,525	1,586	2,832	$ 1,664,107
Beginning balance (in shares) at Dec. 31, 2021							171,126,257
Beginning Balance at Dec. 31, 2021				1,690,079	(2,366)	2,834	$ 1,689,611
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income (loss)	10,752			10,752
Other comprehensive income	5,887			5,887
Ending balance (in shares) at Jun. 30, 2022							171,575,280
Ending Balance at Jun. 30, 2022				1,646,504	3,521	2,830	$ 1,640,153
Beginning balance (in shares) at Mar. 31, 2022							171,383,912
Beginning Balance at Mar. 31, 2022				1,668,525	1,586	2,832	$ 1,664,107
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income (loss)	4,651		14	4,651		(2)	$ 4,653
Other comprehensive income	1,935	$ 1,929	$ 6	1,935	1,935
Deferred compensation obligation	0
Share-based compensation activity (in shares)							191,368
Share-based compensation activity	$ 1,917			1,917			$ 1,917
Adjustment of redeemable partnership units to liquidation value at period end				2,181			2,181
Distributions declared to general partnership unitholders				(32,705)			$ (32,705)
Ending balance (in shares) at Jun. 30, 2022							171,575,280
Ending Balance at Jun. 30, 2022				$ 1,646,504	$ 3,521	$ 2,830	$ 1,640,153

CONSOLIDATED STATEMENTS OF PA_2

CONSOLIDATED STATEMENTS OF PARTNERS’ EQUITY (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021
Net income (loss)	$ 4,651	$ 6,101	$ (175)	$ 6,964
Total comprehensive income	1,935	3,952	1,048	1,098
Deferred compensation obligation	0	(249)	0	(198)
Share-based compensation activity	1,917	1,655	690	2,502
Noncontrolling Interests
Net income (loss)	14	8	(8)	43
Total comprehensive income	6	12	6	6
Accumulated Other Comprehensive Income (Loss)
Total comprehensive income	1,929	3,940	1,042	1,092
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Net income (loss)	4,651	6,101	(175)	6,964
Total comprehensive income	1,935	3,952	1,048	1,098
Deferred compensation obligation		(249)		(198)
Repurchase and retirement of LP units		(4,006)	(2,334)
Share-based compensation activity	1,917	1,655	690	2,502
Adjustment of redeemable partnership units to liquidation value at period end	2,181	3,704	1,066	(1,294)
Partners' Capital Account, Distributions	(32,705)	(32,711)	(32,562)	(32,573)
BRANDYWINE OPERATING PARTNERSHIP, L.P. \| Noncontrolling Interests
Net income (loss)	(2)	(2)	(1)	(1)
BRANDYWINE OPERATING PARTNERSHIP, L.P. \| Accumulated Other Comprehensive Income (Loss)
Total comprehensive income	$ 1,935	$ 3,952	$ 1,048	$ 1,098
BRANDYWINE OPERATING PARTNERSHIP, L.P. \| General Partner Capital
Distributions to general partnership unitholders (USD per share)	$ 0.19	$ 0.19	$ 0.19	$ 0.19
Net income (loss)	$ 4,653	$ 6,103	$ (174)	$ 6,965
Deferred compensation obligation (in shares)		(19,406)		(18,058)
Deferred compensation obligation		$ (249)		$ (198)
Repurchase and retirement of LP units		$ (4,006)	$ (2,334)
Share-based compensation activity (in shares)	191,368	277,061	237,240	108,345
Share-based compensation activity	$ 1,917	$ 1,655	$ 690	$ 2,502
Adjustment of redeemable partnership units to liquidation value at period end	2,181	3,704	1,066	(1,294)
Partners' Capital Account, Distributions	$ (32,705)	$ (32,711)	$ (32,562)	$ (32,573)

CONSOLIDATED STATEMENTS OF CA_3

CONSOLIDATED STATEMENTS OF CASH FLOWS - BRANDYWINE OPERATING PARTNERSHIP L.P. - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities:
Net income	$ 10,752	$ 6,789
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	87,741	83,128
Amortization of deferred financing costs	1,514	1,418
Amortization of debt discount/(premium), net	(975)	(975)
Amortization of stock compensation costs	5,419	4,324
Straight-line rent income	(5,042)	(7,472)
Amortization of acquired above (below) market leases, net	(1,664)	(2,573)
Ground rent expense	408	505
Provision for doubtful accounts	0	67
Total gain on sale of real estate	(5,168)	(2,135)
Loss from unconsolidated real estate ventures, net of distributions	9,544	14,164
Income tax provision	75	34
Changes in assets and liabilities:
Accounts receivable	(1,254)	2,513
Other assets	(2,711)	(2,405)
Accounts payable and accrued expenses	(19,484)	(12,431)
Deferred income, gains and rent	(2,487)	1,887
Other liabilities	1,826	(7,712)
Net cash provided by operating activities	78,494	79,126
Cash flows from investing activities:
Acquisition of properties	(3,446)	0
Proceeds from the sale of properties	34,146	79
Proceeds from insurance	0	1,250
Capital expenditures for tenant improvements	(35,545)	(20,573)
Capital expenditures for redevelopments	(56,472)	(10,005)
Capital expenditures for developments	(82,252)	(18,746)
Advances for the purchase of tenant assets, net of repayments	(447)	290
Investment in unconsolidated real estate ventures	(27,807)	(16,662)
Deposits for real estate	(7,550)	0
Capital distributions from unconsolidated real estate ventures	5,720	5,151
Leasing costs paid	(15,209)	(9,187)
Net cash used in investing activities	(188,862)	(68,403)
Cash flows from financing activities:
Proceeds from credit facility borrowings	196,000	96,000
Repayments of credit facility borrowings	(5,000)	(38,000)
Debt financing costs paid	(6,641)	0
Exercise of stock options, net	0	(63)
Shares used for employee taxes upon vesting of share awards	(2,935)	(1,823)
Partner contributions to consolidated real estate venture	0	2,289
Redemption of limited partnership units	(4,006)	(2,234)
Distributions paid to shareholders	(65,315)	(65,074)
Net cash provided by (used in) financing activities	111,848	(9,288)
Increase in cash and cash equivalents and restricted cash	1,480	1,435
Cash and cash equivalents and restricted cash at beginning of period	28,300	47,077
Cash and cash equivalents and restricted cash at end of period	29,780	48,512
Reconciliation of cash and cash equivalents and restricted cash:
Cash and cash equivalents, beginning of period	27,463	46,344
Restricted cash, beginning of period	837	733
Cash and cash equivalents and restricted cash at beginning of period	28,300	47,077
Cash and cash equivalents, end of period	28,849	47,730
Restricted cash, end of period	931	782
Cash and cash equivalents and restricted cash at end of period	29,780	48,512
Supplemental disclosure:
Cash paid for interest, net of capitalized interest during the six months ended June 30, 2022 and 2021 of $4,442 and $3,734, respectively	37,961	36,961
Cash paid for income taxes	902	21
Supplemental disclosure of non-cash activity:
Dividends and distributions declared but not paid	32,800	32,727
Change in investment in real estate ventures as a result of deconsolidation	0	32,761
Change in operating real estate from deconsolidation of operating properties	0	(30,073)
Change in other assets as a result of deconsolidation of operating properties	0	(2,688)
Change in other assets as a result of investing activities	13,396	0
Change in capital expenditures financed through accounts payable at period end	10,283	(653)
Change in capital expenditures financed through retention payable at period end	(1,097)	(2,339)
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Cash flows from operating activities:
Net income	10,752	6,789
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	87,741	83,128
Amortization of deferred financing costs	1,514	1,418
Amortization of debt discount/(premium), net	(975)	(975)
Amortization of stock compensation costs	5,419	4,324
Straight-line rent income	(5,042)	(7,472)
Amortization of acquired above (below) market leases, net	(1,664)	(2,573)
Ground rent expense	408	505
Provision for doubtful accounts	0	67
Total gain on sale of real estate	(5,168)	(2,135)
Loss from unconsolidated real estate ventures, net of distributions	9,544	14,164
Income tax provision	75	34
Changes in assets and liabilities:
Accounts receivable	(1,254)	2,513
Other assets	(2,711)	(2,405)
Accounts payable and accrued expenses	(19,484)	(12,431)
Deferred income, gains and rent	(2,487)	1,887
Other liabilities	1,826	(7,712)
Net cash provided by operating activities	78,494	79,126
Cash flows from investing activities:
Acquisition of properties	(3,446)	0
Proceeds from the sale of properties	34,146	79
Proceeds from insurance	0	1,250
Capital expenditures for tenant improvements	(35,545)	(20,573)
Capital expenditures for redevelopments	(56,472)	(10,005)
Capital expenditures for developments	(82,252)	(18,746)
Advances for the purchase of tenant assets, net of repayments	(447)	290
Investment in unconsolidated real estate ventures	(27,807)	(16,662)
Deposits for real estate	(7,550)	0
Capital distributions from unconsolidated real estate ventures	5,720	5,151
Leasing costs paid	(15,209)	(9,187)
Net cash used in investing activities	(188,862)	(68,403)
Cash flows from financing activities:
Proceeds from credit facility borrowings	196,000	96,000
Repayments of credit facility borrowings	(5,000)	(38,000)
Debt financing costs paid	(6,641)	0
Exercise of stock options, net	0	(63)
Shares used for employee taxes upon vesting of share awards	(2,935)	(1,823)
Partner contributions to consolidated real estate venture	0	2,289
Redemption of limited partnership units	(4,006)	(2,234)
Distributions paid to shareholders	(65,570)	(65,457)
Net cash provided by (used in) financing activities	111,848	(9,288)
Increase in cash and cash equivalents and restricted cash	1,480	1,435
Cash and cash equivalents and restricted cash at beginning of period	28,300	47,077
Cash and cash equivalents and restricted cash at end of period	29,780	48,512
Reconciliation of cash and cash equivalents and restricted cash:
Cash and cash equivalents, beginning of period	27,463	46,344
Restricted cash, beginning of period	837	733
Cash and cash equivalents and restricted cash at beginning of period	28,300	47,077
Cash and cash equivalents, end of period	28,849	47,730
Restricted cash, end of period	931	782
Cash and cash equivalents and restricted cash at end of period	29,780	48,512
Supplemental disclosure:
Cash paid for interest, net of capitalized interest during the six months ended June 30, 2022 and 2021 of $4,442 and $3,734, respectively	37,961	36,961
Cash paid for income taxes	902	21
Supplemental disclosure of non-cash activity:
Dividends and distributions declared but not paid	32,800	32,727
Change in investment in real estate ventures as a result of deconsolidation	0	32,761
Change in operating real estate from deconsolidation of operating properties	0	(30,073)
Change in other assets as a result of deconsolidation of operating properties	0	(2,688)
Change in other assets as a result of investing activities	13,396	0
Change in capital expenditures financed through accounts payable at period end	10,283	(653)
Change in capital expenditures financed through retention payable at period end	$ (1,097)	$ (2,339)

CONSOLIDATED STATEMENTS OF CA_4

CONSOLIDATED STATEMENTS OF CASH FLOWS - BRANDYWINE OPERATING PARTNERSHIP L.P. (Parenthetical) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Capitalized interest	$ 4,442	$ 3,734
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Capitalized interest	$ 4,442	$ 3,734

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Accrued rent receivable, allowance	$ 4,049	$ 4,133
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	400,000,000	400,000,000
Common stock, shares issued (in shares)	171,575,280	171,126,257
Common stock, shares outstanding (in shares)	171,575,280	171,126,257
Common shares in grantor trust, issued and outstanding (in shares)	1,202,385	1,169,703

ORGANIZATION OF THE PARENT COMP

ORGANIZATION OF THE PARENT COMPANY AND THE OPERATING PARTNERSHIP	6 Months Ended
	Jun. 30, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
ORGANIZATION OF THE PARENT COMPANY AND THE OPERATING PARTNERSHIP	1. ORGANIZATION OF THE PARENT COMPANY AND THE OPERATING PARTNERSHIP Brandywine Realty Trust (the "Parent Company") is a self-administered and self-managed real estate investment trust (“REIT”) engaged in the acquisition, development, redevelopment, ownership, management, and operation of a portfolio of office and mixed-use properties. The Parent Company owns its assets and conducts its operations through Brandywine Operating Partnership, L.P. (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, 2022, owned a 99.7% 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.” The Parent Company, the Operating Partnership, and their consolidated subsidiaries are collectively referred to as the "Company." As of June 30, 2022, the Company owned 78 properties that contained an aggregate of approximately 13.6 million net rentable square feet (collectively, the “Properties”). The Company’s core portfolio of operating properties (the “Core Properties”) excludes development properties, redevelopment properties, and properties held for sale. The Properties were comprised of the following as of June 30, 2022: Number of Properties Rentable Square Feet Office properties 69 12,054,491 Mixed-use properties 5 942,334 Core Properties 74 12,996,825 Development property 1 205,803 Redevelopment properties 3 436,659 The Properties 78 13,639,287 In addition to the Properties, as of June 30, 2022, the Company owned 164.6 acres of land held for development. The Company also held a leasehold interest in two land parcels totaling 1.6 acres, acquired through prepaid 99-year ground leases, and held options to purchase approximately 54.7 additional acres of undeveloped land. As of June 30, 2022, the total potential development that this inventory of land could support under current zoning and entitlements, including the parcels under option, amounted to an estimated 13.1 million square feet. As of June 30, 2022, the Company also owned economic interests in ten unconsolidated real estate ventures (see Note 4, ''Investment in Unconsolidated Real Estate Ventures,” for further information). The Properties and the properties owned by the unconsolidated real estate ventures are primarily located in or near Philadelphia, Pennsylvania; Austin, Texas; Metropolitan Washington, D.C.; Southern New Jersey; and Wilmington, Delaware. The Company conducts its third-party real estate management services business primarily through wholly-owned management company subsidiaries. As of June 30, 2022, the management company subsidiaries were managing properties containing an aggregate of approximately 23.0 million net rentable square feet, of which approximately 13.6 million net rentable square feet related to Properties owned by the Company and approximately 9.4 million net rentable square feet related to properties owned by third parties and unconsolidated 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
BASIS OF PRESENTATION	Jun. 30, 2022
Accounting Policies [Abstract]
BASIS OF PRESENTATION	2. BASIS OF PRESENTATION Basis of Presentation The consolidated financial statements have been prepared by the Company pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (“SEC”) for interim financial statements. Certain information and footnote disclosures normally included in the annual financial statements prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") have been condensed or omitted pursuant to such rules and regulations. In the opinion of management, all adjustments consist solely of normal recurring matters, and result in a fair statement of the financial position of the Company as of June 30, 2022, the results of its operations for the three and six months ended June 30, 2022 and 2021 and its cash flows for the six months ended June 30, 2022 and 2021. 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 Annual Report on Form 10-K for the year ended December 31, 2021 filed with the SEC on February 24, 2022. The consolidated balance sheet at December 31, 2021 has been derived from the audited financial statements as of that date but does not include all the information and footnotes required by GAAP for complete financial statements. The Company's Annual Report on Form 10-K for the year ended December 31, 2021 contains a discussion of its significant accounting policies under Note 2, "Summary of Significant Accounting Policies" . There have been no significant changes in the Company's significant accounting policies since December 31, 2021. Recent Accounting Pronouncements In March 2020, the FASB issued ASU 2020-04 Reference Rate Reform (Topic 848) Facilitation of the Effects of Reference Rate Reform on Financial Reporting. The amendments provide practical expedients for reference rate reform related activities that impact debt, leases, derivatives and other contracts. The guidance is optional and is effective between March 12, 2020 and December 31, 2022. The guidance may be elected over time as reference rate reform activities occur. During the second quarter of 2022, the Company elected to apply the hedge accounting expedients related to probability and the assessments of effectiveness for future LIBOR-indexed cash flows to assume that the index upon which future hedged transactions will be based matches the index on the corresponding derivatives. In addition, the Company elected to apply the hedge accounting expedients related to changes in critical terms of derivative or hedged transactions, and bilaterally negotiated contract changes for the refinance of the Company's term loan and associated interest rate swap. The Company continues to evaluate the impact of the guidance and may apply elections as applicable as additional changes in the market occur.

REAL ESTATE INVESTMENTS

REAL ESTATE INVESTMENTS	6 Months Ended
REAL ESTATE INVESTMENTS	Jun. 30, 2022
Real Estate [Abstract]
REAL ESTATE INVESTMENTS	3. REAL ESTATE INVESTMENTS As of June 30, 2022 and December 31, 2021, the gross carrying value of the operating properties was as follows (in thousands): June 30, 2022 December 31, 2021 Land $ 410,891 $ 410,144 Building and improvements 2,710,368 2,653,492 Tenant improvements 423,843 408,966 Total $ 3,545,102 $ 3,472,602 Acquisitions The following table summarizes the property acquisitions during the six months ended June 30, 2022 (dollars in thousands): Property/Portfolio Name Acquisition Date Location Property Type Rentable Square Feet/Acres Purchase Price 631 Park Avenue January 21, 2022 King of Prussia, PA Land 3.3 acres $ 3,650 3151 Market Street (a) April 29, 2022 Philadelphia, PA Leasehold Interest 0.8 acres $ 27,349 (a) On April 29, 2022, the Company acquired, through a 99-year ground lease, the leasehold interest in a 0.8-acre land parcel, located at 3151 Market Street, in Philadelphia, Pennsylvania. The Company prepaid $19.5 million of the ground lease, representing 500,000 square feet of buildable floor to area ratio ("FAR") to be used for the development of 3151 Market Street, and paid $7.8 million for 200,000 square feet of FAR density usable pursuant to the Schuylkill Yards Project master development agreement. The ground lease and additional density are included in construction in progress and prepaid leasehold interests in land held for development, respectively, in the consolidated balance sheets. See Note 15, ''Subsequent Events," for further information. Dispositions The following table summarizes the property dispositions during the six months ended June 30, 2022 (dollars in thousands): Property/Portfolio Name Disposition Date Location Property Type Rentable Square Feet/Acres Sales Price Gain/(Loss) on Sale (a) Gateway G & H January 20, 2022 Richmond, VA Land 10.0 acres $ 1,600 $ 897 25 M Street April 14, 2022 Washington, D.C. Land 0.8 acres $ 29,675 $ 3,436 Gibbsboro Portfolio June 28, 2022 Gibbsboro, NJ Office/Land 42,809/4.0 acres $ 4,100 $ 831 (b) (a) Gain/(Loss) on Sale is net of closing and other transaction related costs. (b) Includes $0.7 million of gain on sale of undepreciated real estate and $0.1 million of gain on disposition of real estate included within the consolidated statements of operations for the six months ended June 30, 2022. One Uptown Venture On December 1, 2021, the Company entered into two joint venture agreements with affiliates of Canyon Partners Real Estate to commence development of One Uptown, a $328.4 million mixed-use project in Austin, Texas. One Uptown has been designed to deliver 348,000 square feet of Class-A workspace and 15,000 square feet of street-level retail space (through the "office" joint venture) and 341 apartment residences and a public park (through the "multifamily" joint venture) and a six-story parking garage to be shared by the two joint ventures. The Company's partner in each of the two joint ventures has agreed, subject to customary funding conditions, including closing of the applicable construction loan, to fund approximately $61.0 million of the combined project costs in exchange for a 50% preferred equity interest in each of the two joint ventures, with the Company retaining a 50% common equity interest in each. As of June 30, 2022, the Company was in the process of securing a construction loan for each of the two joint ventures that would total approximately $206.7 million, representing 63% of the combined project costs. Under the terms of each of the joint venture agreements, the joint venture partner has no obligation to fund any portion of the applicable project costs until the closing of the applicable construction loan. This right prevented the Company from meeting the sale recognition criteria of ASC 606 until the applicable closings of the construction loans. On July 29, 2022, the One Uptown Ventures closed on two separate construction loans. The office joint venture closed on a $121.7 million construction loan which bears interest at SOFR plus 3.00% and the multifamily joint venture closed on an $85.0 million construction which bears interest at SOFR plus 2.45%, plus, in each case, a daily SOFR adjustment of 10 basis points. Both loans mature in July 2026. The Company has also provided a carry guarantee and limited payment guarantee up to 30% and 15% of the principal balance of the $121.7 million and $85 million construction loan, respectively. The Company subsequently recognized the formation of the joint ventures and deconsolidated the projects.

INVESTMENT IN UNCONSOLIDATED RE

INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES	6 Months Ended
INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES	Jun. 30, 2022
Equity Method Investments and Joint Ventures [Abstract]
INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES	4. INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES As of June 30, 2022, the Company held ownership interests in ten unconsolidated real estate ventures for a net aggregate investment balance of $429.3 million, which includes a negative investment balance in one unconsolidated real estate venture of $29.6 million, reflected within "Other liabilities" on the consolidated balance sheets. As of June 30, 2022, five of the real estate ventures owned properties that contained an aggregate of approximately 9.1 million net rentable square feet of office space; two real estate ventures owned 1.4 acres of land held for development; one real estate venture owned 1.0 acres of land in active development; one real estate venture owned a mixed used tower comprised of 250 apartment units and 0.2 million net rentable square feet of office/retail space; and one real estate venture owned a residential tower that contained 321 apartment units. The Company accounts for its interests in the unconsolidated real estate ventures, which range from 15% to 70%, using the equity method. Certain of the unconsolidated real estate ventures are subject to specified priority allocations of distributable cash. The Company earned management fees from the unconsolidated real estate ventures of $2.1 million and $2.1 million for the three months ended June 30, 2022 and 2021, respectively, and $4.0 million and $4.1 million for the six months ended June 30, 2022 and 2021, respectively. The Company earned leasing commissions from the unconsolidated real estate ventures of $0.8 million and $0.6 million for the three months ended June 30, 2022 and 2021, respectively, and $1.1 million and $1.9 million for the six months ended June 30, 2022 and 2021, respectively. The Company had outstanding accounts receivable balances from the unconsolidated real estate ventures of $2.8 million and $2.5 million as of June 30, 2022 and December 31, 2021, respectively. The amounts reflected in the following tables (except for the Company’s share of equity in income) are based on the financial information of the individual unconsolidated real estate ventures. The following is a summary of the financial position of the unconsolidated real estate ventures in which the Company held interests as of June 30, 2022 and December 31, 2021 (in thousands): June 30, 2022 December 31, 2021 Net property $ 1,962,902 $ 1,563,263 Other assets 516,328 434,687 Other liabilities 415,816 331,947 Debt, net 1,218,561 956,668 Equity (a) 844,853 709,335 (a) This amount does not include the effect of the basis difference between the Company's historical cost basis and the basis recorded at the real estate venture level, which is typically amortized over the life of the related assets and liabilities. Basis differentials occur from the impairment of investments, purchases of third party interests in existing real estate ventures and upon the transfer of assets that were previously owned by the Company into a real estate venture. In addition, certain acquisition, transaction and other costs may not be reflected in the net assets at the real estate venture level. The following is a summary of results of operations of the unconsolidated real estate ventures in which the Company held interests during the three and six month periods ended June 30, 2022 and 2021 (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2022 2021 2022 2021 Revenue $ 64,957 $ 53,228 $ 118,173 $ 106,585 Operating expenses (31,671) (28,629) (60,263) (57,616) Interest expense, net (11,663) (8,017) (19,132) (15,391) Depreciation and amortization (27,927) (25,500) (49,210) (50,393) Net loss $ (6,304) $ (8,918) $ (10,432) $ (16,815) Ownership interest % Various Various Various Various Company's share of net loss $ (4,822) $ (7,281) $ (9,439) $ (13,822) Basis adjustments and other (159) 41 (105) (342) Equity in loss of unconsolidated real estate ventures $ (4,981) $ (7,240) $ (9,544) $ (14,164) Cira Square Venture On March 17, 2022, the Company formed a joint venture, Cira Square REIT, LLC (“Cira Square Venture”), for the purpose of acquiring Cira Square, an office property located at 2970 Market Street in Philadelphia, Pennsylvania containing 862,692 rentable square feet for a gross purchase price of $383.0 million. The Company owns a 20% common equity interest in Cira Square Venture and provided an initial capital contribution of $28.6 million on the closing date. On the closing date, Cira Square Venture also obtained $257.7 million of third-party debt financing secured by the property. The loan bears interest at 3.50% over one-month term Secured Overnight Financing Rate ("SOFR") per annum and matures in March 2024.

LEASES

LEASES	6 Months Ended
LEASES	Jun. 30, 2022
Leases [Abstract]
LEASES	5. LEASES Lessor Accounting The table below sets forth the allocation of lease revenue between fixed contractual payments and variable lease payments for the three and six months ended June 30, 2022 and 2021 (in thousands): Three Months Ended June 30, Six Months Ended June 30, Lease Revenue 2022 2021 2022 2021 Fixed contractual payments $ 88,672 $ 86,117 $ 177,435 $ 172,497 Variable lease payments 25,234 22,060 49,565 46,208 Total $ 113,906 $ 108,177 $ 227,000 $ 218,705

INTANGIBLE ASSETS AND LIABILITI

INTANGIBLE ASSETS AND LIABILITIES	6 Months Ended
INTANGIBLE ASSETS AND LIABILITIES	Jun. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
INTANGIBLE ASSETS AND LIABILITIES	6. INTANGIBLE ASSETS AND LIABILITIES As of June 30, 2022 and December 31, 2021, the Company’s intangible assets/liabilities were comprised of the following (in thousands): June 30, 2022 Total Cost Accumulated Amortization Intangible Assets, net Intangible assets, net: In-place lease value $ 59,582 $ (36,770) $ 22,812 Tenant relationship value 167 (100) 67 Above market leases acquired 331 (195) 136 Total intangible assets, net $ 60,080 $ (37,065) $ 23,015 Total Cost Accumulated Amortization Intangible Liabilities, net Intangible liabilities, net: Below market leases acquired $ 22,268 $ (10,991) $ 11,277 December 31, 2021 Total Cost Accumulated Amortization Intangible Assets, net Intangible assets, net: In-place lease value $ 72,376 $ (44,066) $ 28,310 Tenant relationship value 167 (97) 70 Above market leases acquired 486 (310) 176 Total intangible assets, net $ 73,029 $ (44,473) $ 28,556 Total Cost Accumulated Amortization Intangible Liabilities, net Intangible liabilities, net: Below market leases acquired $ 27,025 $ (14,044) $ 12,981 As of June 30, 2022, the Company’s annual amortization for its intangible assets/liabilities, assuming no prospective early lease terminations, was as follows (dollars in thousands): Assets Liabilities 2022 (six months remaining) $ 4,100 $ 883 2023 6,724 1,540 2024 4,433 1,321 2025 3,255 1,044 2026 1,195 754 Thereafter 3,308 5,735 Total $ 23,015 $ 11,277

DEBT OBLIGATIONS

DEBT OBLIGATIONS	6 Months Ended
DEBT OBLIGATIONS	Jun. 30, 2022
Debt Disclosure [Abstract]
DEBT OBLIGATIONS	7. DEBT OBLIGATIONS The following table sets forth information regarding the Company’s consolidated debt obligations outstanding as of June 30, 2022 and December 31, 2021 (in thousands): June 30, 2022 December 31, 2021 Effective Maturity UNSECURED DEBT $600 million Unsecured Credit Facility $ 214,000 $ 23,000 SOFR + 1.15% June 2026 (a) Term Loan - Swapped to fixed 250,000 250,000 2.87% June 2027 (b) $350.0M 3.95% Guaranteed Notes due 2023 350,000 350,000 3.87% February 2023 $350.0M 4.10% Guaranteed Notes due 2024 350,000 350,000 3.78% October 2024 $450.0M 3.95% Guaranteed Notes due 2027 450,000 450,000 4.03% November 2027 $350.0M 4.55% Guaranteed Notes due 2029 350,000 350,000 4.30% October 2029 Indenture IA (Preferred Trust I) 27,062 27,062 LIBOR + 1.25% March 2035 Indenture IB (Preferred Trust I) 25,774 25,774 LIBOR + 1.25% April 2035 Indenture II (Preferred Trust II) 25,774 25,774 LIBOR + 1.25% July 2035 Principal balance outstanding 2,042,610 1,851,610 Plus: original issue premium (discount), net 7,212 8,187 Less: deferred financing costs (7,063) (6,211) Total unsecured indebtedness $ 2,042,759 $ 1,853,586 (a) Spread includes a 10 basis point daily SOFR adjustment. (b) On June 30, 2022, the Company executed the 2022 Credit Agreement (as defined below), that provides for, among other things, the Term Loan (as defined below), which replaced the Company's $250.0 million term loan that had been scheduled to mature on October 22, 2022. As of June 30, 2022, based on the Operating Partnership's unsecured senior debt rating, the applicable margin for the Term Loan was 120.0 basis points, plus a daily SOFR adjustment of 10 basis points. Through a series of interest rate swaps, the $250.0 million principal amount of the Term Loan has a fixed interest rate of 2.87% until October 8, 2022. On June 30, 2022, the Company executed the Second Amended and Restated Credit Agreement (as amended and restated, the “2022 Credit Agreement”). The 2022 Credit Agreement among other things: (i) maintains the total commitment under the line credit of $600.0 million (the "Revolving Credit Facility") and provides an unsecured term loan in the initial amount of $250.0 million (the "Term Loan") with a scheduled maturity date of June 30, 2027; (ii) extended the maturity date of the Revolving Credit Facility from July 15, 2022 to June 30, 2026, with two six-month extensions at the Company’s election subject to specified conditions and subject to payment of an extension fee; (iii) reduced the interest rate margins applicable to SOFR revolving loans; and (iv) provides for an additional interest rate option based on a floating SOFR rate. In connection with the amendments, the Company capitalized $4.7 million and $2.0 million in financing costs, related to the Revolving Credit Facility and the Term Loan, respectively. The financing costs will be amortized through the maturity dates for each of the Revolving Credit Facility and the Term Loan. Under the 2022 Credit Agreement, the Company may, subject to specified terms and conditions (including receipt of commitments from one or more lenders, whether or not currently parties to the 2022 Credit Agreement), elect to increase the amount of the Revolving Credit Facility and/or Term Loan or request one or more new pari passu tranches of unsecured term loans (each, an "Incremental Facility"), provided that the aggregate amount of all such increases is limited to $500.0 million. Up to $50.0 million of borrowing availability under the Restated Credit Agreement is available for the issuance of letter of credits. Borrowings under the Revolving Credit Facility bear interest at a rate equal to either (i) the SOFR rate plus a margin of 72.5 to 140 basis points, or (ii) a base rate plus a margin of 0 to 40 basis points: and the Term Loan and borrowings under an Incremental Facility bear interest at a rate equal to either (i) the SOFR rate plus a margin of 80 to 160 basis points, or (ii) a base rate plus a margin of 0 to 60 basis points. The applicable margin will be determined based upon the unsecured senior debt rating of the Operating Partnership or the absence of such a rating. The Company also pays a quarterly facility fee on the total commitments under the Revolving Credit Facility. As of June 30, 2022, based on the Operating Partnership's unsecured senior debt rating, the applicable margin for SOFR revolving loans under the Revolving Credit Facility was 105 basis points (excluding the applicable facility fee rate of 25 basis points) and was 120.0 basis points for the Term Loan, plus, in each case, a daily SOFR adjustment of 10 basis points. The terms of the 2022 Credit Agreement 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 leverage ratio less than or equal to 0.60 to 1.00, subject to specified exceptions; (iii) a ratio of unsecured indebtedness to unencumbered asset value less than or equal to 0.60 to 1.00, subject to specified exceptions; (iv) a ratio of secured indebtedness to total asset value less than or equal to 0.40 to 1.00; and (v) a ratio of unencumbered cash flow to interest expense on unsecured debt greater than 1.75 to 1.00. In addition, the 2022 Credit Agreement 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. During the six months ended June 30, 2022, the weighted-average interest rate on unsecured credit facility borrowings was 1.72% resulting in $1.2 million of interest expense. As of June 30, 2022, the Company had $381.7 million of available borrowings under its unsecured credit facility, net of $4.3 million in letters of credit outstanding. The Parent Company unconditionally guarantees the unsecured debt obligations of the Operating Partnership (or is a co-borrower with the Operating Partnership) but does not by itself incur unsecured indebtedness. The Parent Company has no material assets other than its investment in the Operating Partnership. The Company was in compliance with all financial covenants as of June 30, 2022. Certain of the covenants restrict the Company’s ability to obtain alternative sources of capital. As of June 30, 2022, the aggregate scheduled principal payments on the Company's debt obligations were as follows (in thousands): 2022 (six months remaining) $ — 2023 350,000 2024 350,000 2025 — 2026 214,000 Thereafter 1,128,610 Total principal payments 2,042,610 Net unamortized premiums/(discounts) 7,212 Net deferred financing costs (7,063) Outstanding indebtedness $ 2,042,759

FAIR VALUE OF FINANCIAL INSTRUM

FAIR VALUE OF FINANCIAL INSTRUMENTS	6 Months Ended
FAIR VALUE OF FINANCIAL INSTRUMENTS	Jun. 30, 2022
Fair Value Disclosures [Abstract]
FAIR VALUE OF FINANCIAL INSTRUMENTS	8. FAIR VALUE OF FINANCIAL INSTRUMENTS Financial assets and liabilities recorded on the consolidated balance sheets are categorized based on the inputs to the valuation techniques as follows: • Level 1 inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities that the Company has the ability to access; • Level 2 inputs are inputs, other than quoted prices included in Level 1, which are observable for the asset or liability, either directly or indirectly. Level 2 inputs may include quoted prices for similar assets and liabilities in active markets, as well as inputs that are observable for the asset or liability (other than quoted prices), such as interest rates, foreign exchange rates, and yield curves that are observable at commonly quoted intervals; and • Level 3 inputs are unobservable inputs for the asset or liability, which is typically based on an entity’s own assumptions, as there is little, if any, related market activity or information. The Company determined the fair values disclosed below using available market information and discounted cash flow analyses as of June 30, 2022 and December 31, 2021, 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, 2022 and December 31, 2021 approximate the fair values for cash and cash equivalents, accounts receivable, other assets and liabilities, accounts payable and accrued expenses because they are short-term in duration. The following are financial instruments for which the Company’s estimates of fair value differ from the carrying amounts (in thousands): June 30, 2022 December 31, 2021 Carrying Amount (a) Fair Value Carrying Amount (a) Fair Value Unsecured notes payable $ 1,502,102 $ 1,461,960 $ 1,502,368 $ 1,588,780 Variable rate debt $ 540,657 $ 542,610 $ 351,218 $ 344,754 Notes receivable $ 44,430 $ 44,058 $ 44,430 $ 45,230 (a) Net of deferred financing costs of $5.1 million and $5.8 million for unsecured notes payable and $2.0 million and $0.4 million for variable rate debt as of June 30, 2022 and December 31, 2021. The Company used quoted market prices as of June 30, 2022 and December 31, 2021 to value the unsecured notes payable and, as such, categorized them as Level 2. The inputs utilized to determine the fair value of the Company’s variable rate debt are categorized as Level 3. The fair value of the variable rate debt was determined using a discounted cash flow model that considered borrowing rates available to the Company for loans with similar terms and characteristics. The inputs utilized to determine fair value of the Company's notes receivable are unobservable and, as such, were categorized as Level 3. Fair value was determined using a discounted cash flow model that considered the contractual interest and principal payments discounted at a blended interest rate of the notes receivable. For the Company’s Level 3 financial instruments for which fair value is disclosed, an increase in the discount rate used to determine fair value would result in a decrease to the fair value. Conversely, a decrease in the discount rate would result in an increase to the fair value. Disclosure about the fair value of financial instruments is based upon pertinent information available to management as of June 30, 2022 and December 31, 2021. Although management is not aware of any factors that would significantly affect the fair value amounts, such amounts were not comprehensively revalued for purposes of these financial statements since June 30, 2022. Current estimates of fair value may differ from the amounts presented herein.

DERIVATIVE FINANCIAL INSTRUMENT

DERIVATIVE FINANCIAL INSTRUMENTS	6 Months Ended
DERIVATIVE FINANCIAL INSTRUMENTS	Jun. 30, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVE FINANCIAL INSTRUMENTS	9. DERIVATIVE FINANCIAL INSTRUMENTS The following table summarizes the terms and fair values of the Company’s derivative financial instruments as of June 30, 2022 and December 31, 2021. The notional amounts provide an indication of the extent of the Company’s involvement in these instruments at that time, but do not represent exposure to credit, interest rate or market risks (amounts presented in thousands). Hedge Product Hedge Type Designation Notional Amount Strike Trade Date Maturity Date Fair value 6/30/2022 12/31/2021 6/30/2022 12/31/2021 Assets Swap Interest Rate Cash Flow (a) $ 250,000 $ 250,000 2.868 % October 8, 2015 October 8, 2022 $ 415 $ (2,461) $ 250,000 $ 250,000 (a) Hedging unsecured variable rate debt. The Company measures its derivative instruments at fair value and records them in “Other assets” and (“Other liabilities”) on the Company’s consolidated balance sheets. Although the Company has determined that the majority of the inputs used to value its derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by itself and its counterparties. The Company has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and has determined that the credit valuation adjustments are not significant to the overall valuation of its derivatives. As a result, the Company has determined that the inputs utilized to determine the fair value of derivative instruments are classified in Level 2 of the fair value hierarchy.

LIMITED PARTNERS' NONCONTROLLIN

LIMITED PARTNERS' NONCONTROLLING INTERESTS IN THE PARENT COMPANY	6 Months Ended
	Jun. 30, 2022
Noncontrolling Interest [Abstract]
LIMITED PARTNERS' NONCONTROLLING INTERESTS IN THE PARENT COMPANY	10. LIMITED PARTNERS' NONCONTROLLING INTERESTS IN THE PARENT COMPANY Noncontrolling 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 by the Operating Partnership. Operating Partnership During the six months ended June 30, 2022, 307,516 Class A units of limited partnership interest held by unaffiliated third parties were redeemed for a total cash payment of $4.0 million. The aggregate book value of the noncontrolling interests associated with the redeemable common limited partnership interests in the accompanying consolidated balance sheet of the Parent Company was $5.0 million and $8.2 million as of June 30, 2022 and December 31, 2021, respectively. Under the applicable accounting guidance, the redemption value of limited partnership units are carried at fair value. The Parent Company believes that the aggregate settlement value of these interests (based on the

BENEFICIARIES' EQUITY OF THE PA

BENEFICIARIES' EQUITY OF THE PARENT COMPANY	6 Months Ended
BENEFICIARIES' EQUITY OF THE PARENT COMPANY	Jun. 30, 2022
Equity [Abstract]
BENEFICIARIES' EQUITY OF THE PARENT COMPANY	11. BENEFICIARIES' EQUITY OF THE PARENT COMPANY Earnings per Share (EPS) The following table details 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 Months Ended June 30, 2022 2021 Basic Diluted Basic Diluted Numerator Net income $ 4,651 $ 4,651 $ (175) $ (175) Net (income) loss attributable to noncontrolling interests (14) (14) 8 8 Nonforfeitable dividends allocated to unvested restricted shareholders (98) (98) (94) (94) Net income (loss) attributable to common shareholders $ 4,539 $ 4,539 $ (261) $ (261) Denominator Weighted-average shares outstanding 171,527,031 171,527,031 170,848,894 170,848,894 Contingent securities/Share based compensation — 733,398 — — Weighted-average shares outstanding 171,527,031 172,260,429 170,848,894 170,848,894 Earnings per Common Share: Net income attributable to common shareholders $ 0.03 $ 0.03 $ — $ — Six Months Ended June 30, 2022 2021 Basic Diluted Basic Diluted Numerator Net income $ 10,752 $ 10,752 $ 6,789 $ 6,789 Net income attributable to noncontrolling interests (22) (22) (35) (35) Nonforfeitable dividends allocated to unvested restricted shareholders (246) (246) (240) (240) Net income attributable to common shareholders $ 10,484 $ 10,484 $ 6,514 $ 6,514 Denominator Weighted-average shares outstanding 171,411,631 171,411,631 170,737,437 170,737,437 Contingent securities/Share based compensation — 1,163,777 — 1,258,682 Weighted-average shares outstanding 171,411,631 172,575,408 170,737,437 171,996,119 Earnings per Common Share: Net income attributable to common shareholders $ 0.06 $ 0.06 $ 0.04 $ 0.04 Redeemable common limited partnership units totaling 516,467 at June 30, 2022 and 823,983 at June 30, 2021, 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 months ended June 30, 2022 and 2021, 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 Shares On May 18, 2022, the Parent Company declared a distribution of $0.19 per common share, totaling $32.8 million, which was paid on July 20, 2022 to shareholders of record as of July 6, 2022.

PARTNERS' EQUITY OF THE PARENT

PARTNERS' EQUITY OF THE PARENT COMPANY	6 Months Ended
PARTNERS' EQUITY OF THE PARENT COMPANY	Jun. 30, 2022
Equity [Abstract]
PARTNERS' EQUITY OF THE PARENT COMPANY	12. PARTNERS' EQUITY OF THE PARENT COMPANY Earnings per Common Partnership Unit The following table details 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 Months Ended June 30, 2022 2021 Basic Diluted Basic Diluted Numerator Net income (loss) $ 4,651 $ 4,651 $ (175) $ (175) Net loss attributable to noncontrolling interests 2 2 1 1 Nonforfeitable dividends allocated to unvested restricted unitholders (98) (98) (94) (94) Net income (loss) attributable to common unitholders $ 4,555 $ 4,555 $ (268) $ (268) Denominator Weighted-average units outstanding 172,043,498 172,043,498 171,792,415 171,792,415 Contingent securities/Share based compensation — 733,398 — — Total weighted-average units outstanding 172,043,498 172,776,896 171,792,415 171,792,415 Earnings per Common Partnership Unit: Net income attributable to common unitholders $ 0.03 $ 0.03 $ — $ — Six Months Ended June 30, 2022 2021 Basic Diluted Basic Diluted Numerator Net income $ 10,752 $ 10,752 $ 6,789 $ 6,789 Net loss attributable to noncontrolling interests 4 4 2 2 Nonforfeitable dividends allocated to unvested restricted unitholders (246) (246) (240) (240) Net income attributable to common unitholders $ 10,510 $ 10,510 $ 6,551 $ 6,551 Denominator Weighted-average units outstanding 171,985,863 171,985,863 171,699,909 171,699,909 Contingent securities/Share based compensation — 1,163,777 — 1,258,682 Total weighted-average units outstanding 171,985,863 173,149,640 171,699,909 172,958,591 Earnings per Common Partnership Unit: Net income attributable to common unitholders $ 0.06 $ 0.06 $ 0.04 $ 0.04 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 unit. For the three and six months ended June 30, 2022 and 2021, earnings representing nonforfeitable dividends 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 On May 18, 2022, the Operating Partnership declared a distribution of $0.19 per common partnership unit, totaling $32.8 million, which was paid on July 20, 2022 to unitholders of record as of July 6, 2022. In connection with the Parent Company’s common share repurchase program, one common unit of the Operating Partnership is retired for each common share repurchased. During the six months ended June 30, 2022 and June 30, 2021, the Company did not repurchase any units.

SEGMENT INFORMATION

SEGMENT INFORMATION	6 Months Ended
SEGMENT INFORMATION	Jun. 30, 2022
Segment Reporting [Abstract]
SEGMENT INFORMATION	13. SEGMENT INFORMATION As of June 30, 2022, the Company owns and manages properties within five segments: (1) Philadelphia Central Business District ("Philadelphia CBD"), (2) Pennsylvania Suburbs, (3) Austin, Texas (4) Metropolitan Washington, D.C. and (5) Other. The Philadelphia CBD segment includes properties located in the City of Philadelphia, Pennsylvania. The Pennsylvania Suburbs segment includes properties in Chester, Delaware, and Montgomery counties in the Philadelphia suburbs. The Austin, Texas segment includes properties in the City of Austin, Texas. The Metropolitan Washington, D.C. segment includes properties in the District of Columbia, Northern Virginia and Southern Maryland. The Other segment includes properties located in Camden County, New Jersey and New Castle County, Delaware. In addition to the five segments, the corporate group is responsible for cash and investment management, development of certain real estate properties during the construction period, and certain other general support functions. Land held for development and construction in progress is transferred to operating properties by region upon completion of the associated construction or project. The following tables provide selected asset information and results of operations of the Company's reportable segments (in thousands): Real estate investments, at cost: June 30, 2022 December 31, 2021 Philadelphia CBD $ 1,506,350 $ 1,460,510 Pennsylvania Suburbs 870,510 866,223 Austin, Texas 794,734 778,145 Metropolitan Washington, D.C. 287,215 280,921 Other 86,293 86,803 Operating Properties $ 3,545,102 $ 3,472,602 Corporate Right of use asset - operating leases, net $ 19,988 $ 20,313 Construction-in-progress $ 366,823 $ 277,237 Land held for development $ 93,887 $ 114,604 Prepaid leasehold interests in land held for development, net $ 35,576 $ 27,762 Net operating income: Three Months Ended June 30, 2022 2021 Total revenue Operating expenses (a) Net operating income Total revenue Operating expenses (a) Net operating income Philadelphia CBD $ 55,426 $ (20,538) $ 34,888 $ 51,445 $ (18,259) $ 33,186 Pennsylvania Suburbs 31,333 (10,258) 21,075 30,294 (9,777) 20,517 Austin, Texas 23,921 (10,438) 13,483 25,513 (9,962) 15,551 Metropolitan Washington, D.C. 5,486 (3,116) 2,370 4,812 (3,902) 910 Other 3,919 (2,342) 1,577 3,662 (2,528) 1,134 Corporate 3,957 (2,957) 1,000 4,376 (2,999) 1,377 Operating properties $ 124,042 $ (49,649) $ 74,393 $ 120,102 $ (47,427) $ 72,675 Six Months Ended June 30, 2022 2021 Total revenue Operating expenses (a) Net operating income Total revenue Operating expenses (a) Net operating income Philadelphia CBD $ 108,897 $ (40,281) $ 68,616 $ 102,672 $ (35,670) 67,002 Pennsylvania Suburbs 63,140 (20,416) 42,724 62,034 (20,471) 41,563 Austin, Texas 48,836 (20,731) 28,105 51,688 (19,682) 32,006 Metropolitan Washington, D.C. 10,681 (6,544) 4,137 9,487 (8,101) 1,386 Other 7,523 (4,352) 3,171 6,875 (4,810) 2,065 Corporate 12,470 (5,243) 7,227 8,115 (5,367) 2,748 Operating properties $ 251,547 $ (97,567) $ 153,980 $ 240,871 $ (94,101) $ 146,770 Unconsolidated real estate ventures: Investment in real estate ventures Equity in income (loss) of real estate venture As of Three Months Ended June 30, June 30, 2022 December 31, 2021 2022 2021 Philadelphia CBD $ 341,748 $ 317,959 $ (2,574) $ (4,661) Metropolitan Washington, D.C. 85,614 85,867 (381) (778) Mid-Atlantic Office JV 31,478 31,680 (101) 117 MAP Venture (29,594) (24,396) (1,925) (1,918) Total $ 429,246 $ 411,110 $ (4,981) $ (7,240) Net operating income (“NOI”) is a non-GAAP financial measure, which we define as total revenue less property operating expenses, real estate taxes and third party management expenses. Property operating expenses that are included in determining NOI consist of costs that are necessary and allocable to our operating properties such as utilities, property-level salaries, repairs and maintenance, property insurance and management fees. General and administrative expenses that are not reflected in NOI primarily consist of corporate-level salaries, amortization of share awards and professional fees that are incurred as part of corporate office management. NOI presented by the Company may not be comparable to NOI reported by other companies that define NOI differently. NOI is the primary measure that is used by the Company’s management to evaluate the operating performance of the Company’s real estate assets by segment. The Company believes NOI provides useful information to investors regarding the financial condition and results of operations because it reflects only those income and expense items that are incurred at the property level. While NOI is a relevant and widely used measure of operating performance of real estate investment trusts, it does not represent cash flow from operations or net income as defined by GAAP and should not be considered as an alternative to those measures in evaluating our liquidity or operating performance. NOI does not reflect interest expenses, real estate impairment losses, depreciation and amortization costs, capital expenditures and leasing costs. The Company believes that net income (loss), as defined by GAAP, is the most appropriate earnings measure. The following is a reconciliation of consolidated net income (loss), as defined by GAAP, to consolidated NOI, (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2022 2021 2022 2021 Net income (loss) $ 4,651 $ (175) $ 10,752 $ 6,789 Plus: Interest expense 16,341 15,490 32,083 31,783 Interest expense - amortization of deferred financing costs 805 709 1,514 1,418 Depreciation and amortization 43,959 42,785 87,741 83,128 General and administrative expenses 8,328 8,356 18,328 14,940 Equity in loss of unconsolidated real estate ventures 4,981 7,240 9,544 14,164 Less: Interest and investment income 449 1,677 889 3,351 Income tax provision (48) (15) (75) (34) Net gain on disposition of real estate 144 68 144 142 Net gain on sale of undepreciated real estate 4,127 — 5,024 1,993 Consolidated net operating income $ 74,393 $ 72,675 $ 153,980 $ 146,770

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	6 Months Ended
COMMITMENTS AND CONTINGENCIES	Jun. 30, 2022
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	14. COMMITMENTS AND CONTINGENCIES Legal Proceedings The Company is involved from time to time in litigation on various matters, including disputes with tenants, vendors and disputes arising out of agreements to purchase or sell properties. Given the nature of the Company’s business activities, these lawsuits are considered routine to the conduct of its business. The result of any particular lawsuit cannot be predicted, because of the very nature of litigation, the litigation process and its adversarial nature, and the jury system. The Company will establish reserves for specific legal proceedings when it determines that the likelihood of an unfavorable outcome is probable and when the amount of loss is reasonably estimable. The Company does not expect that the liabilities, if any, that may ultimately result from such legal actions will have a material adverse effect on the consolidated financial position, results of operations or cash flows of the Company. 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. Debt Guarantees As of June 30, 2022, the Company’s unconsolidated real estate ventures had aggregate indebtedness of $1,224.5 million. These loans are generally mortgage or construction loans, most of which are nonrecourse to the Company, except for customary recourse carve-outs. In addition, during construction undertaken by the unconsolidated real estate ventures, including the 3025 JFK Venture, the Company has provided, and expects to continue to provide, cost overrun and completion guarantees, as well as customary environmental indemnities and guarantees of customary exceptions to nonrecourse provisions in loan agreements. In the agreement with its partner in the 3025 JFK Venture, the Company agreed to provide cost overrun and completion guaranties for the project under development. With respect to the construction loan obtained by 3025 JFK Venture on July 23, 2021, the Company has also provided a carry guarantee and limited payment guarantee up to 25% of the principal balance of the $186.7 million construction loan. Impact of Natural Disasters and Casualty The Company carries liability insurance to mitigate its exposure to certain losses, including those relating to property damage. The Company records the estimated amount of expected insurance proceeds for property damage and other losses incurred as an asset (typically a receivable from the insurer) and income up to the amount of the losses incurred when receipt of insurance proceeds is deemed probable. Any amount of insurance recovery in excess of the amount of the losses is considered a gain contingency and is not recorded until the proceeds are received. In February 2021, one of the Company's properties in Austin, Texas sustained damage from the winter storms and resulting power grid failures. As a result of the damage, during the year ended December 31, 2021, the Company recorded a fixed asset write-off totaling $1.2 million and recorded an estimated $7.2 million of restoration costs, of which $1.9 million is included in accounts payable and accrued expenses on the consolidated balance sheets as of December 31, 2021. The Company also sustained business interruption loss of $3.9 million related to unpaid rent, which is also fully covered under the insurance policy. During the year ended December 31, 2021, the Company received $15.3 million of insurance proceeds, resulting in full recovery of the costs incurred to date. The $3.0 million of insurance proceeds received in excess of the fixed asset write-off, total business interruption, and total estimated restoration cost during the year ended December 31, 2021 is included in other income on the consolidated statement of operations. During the six months ended June 30, 2022, the Company recognized a $0.8 million reduction of the previously estimated restoration costs and also received $2.4 million of additional insurance proceeds. The reduction of the restoration costs and additional insurance proceeds are included in other income on the consolidated statement of operations. Other Commitments or Contingencies Under the terms of each of the One Uptown joint venture agreements, the joint venture partner is not required to fund project costs until the closing of the applicable construction loans. In the event that the Company does not close on the applicable construction loan for each of the joint ventures by July 30, 2022, the joint venture partner could elect to assign its interest in the project to the Company and have no obligation to fund the project costs. In addition, the Company has provided cost overrun and completion guarantees, as well as customary environmental indemnities, in favor of the joint venture partner, for each of the One Uptown joint ventures. On July 29, 2022, the One Uptown joint ventures closed on two construction loans. See Note 3, ''Real Estate Investments,” to our Consolidated Financial Statements for further information. In connection with the Schuylkill Yards Project, the Company entered into a neighborhood engagement program and, as of June 30, 2022, had $7.2 million of future fixed contractual obligations. The Company also committed to fund additional contributions under the program. As of June 30, 2022, the Company estimates that these additional contributions, which are not fixed under the terms of agreement, will be $2.3 million. In connection with the formation of the Commerce Square Venture, the Company has committed to investing an additional $20.0 million of preferred equity in the properties on a pari passu basis with its joint venture partner of which $5.9 million has been contributed by the Company as of June 30, 2022. The Company invests in its properties and regularly incurs capital expenditures in the ordinary course of business to maintain the properties. The Company believes that such expenditures enhance its competitiveness. The Company also enters into

SUBSEQUENT EVENTS

SUBSEQUENT EVENTS	6 Months Ended
SUBSEQUENT EVENTS	Jun. 30, 2022
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	15. SUBSEQUENT EVENTS On July 14, 2022, the Company formed a joint venture, with an unaffiliated third party, to develop an approximately 417,000 square foot life science/office building under a long-term ground lease located at 3151 Market Street in Philadelphia, Pennsylvania. The estimated project cost is approximately $307 million, and the joint venture partner has agreed, subject to customary funding conditions, to fund up to approximately $55 million of the project costs in exchange for a 45% preferred equity interest in the venture. We have agreed to provide a completion guaranty in connection with the development of the project.

BASIS OF PRESENTATION (Policies

BASIS OF PRESENTATION (Policies)	6 Months Ended
BASIS OF PRESENTATION (Policies)	Jun. 30, 2022
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The consolidated financial statements have been prepared by the Company pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (“SEC”) for interim financial statements. Certain information and footnote disclosures normally included in the annual financial statements prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") have been condensed or omitted pursuant to such rules and regulations. In the opinion of management, all adjustments consist solely of normal recurring matters, and result in a fair statement of the financial position of the Company as of June 30, 2022, the results of its operations for the three and six months ended June 30, 2022 and 2021 and its cash flows for the six months ended June 30, 2022 and 2021. 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 Annual Report on Form 10-K for the year ended December 31, 2021 filed with the SEC on February 24, 2022. The consolidated balance sheet at December 31, 2021 has been derived from the audited financial statements as of that date but does not include all the information and footnotes required by GAAP for complete financial statements. The Company's Annual Report on Form 10-K for the year ended December 31, 2021 contains a discussion of its significant accounting policies under Note 2, "Summary of Significant Accounting Policies" . There have been no significant changes in the Company's significant accounting policies since December 31, 2021.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In March 2020, the FASB issued ASU 2020-04 Reference Rate Reform (Topic 848) Facilitation of the Effects of Reference Rate Reform on Financial Reporting. The amendments provide practical expedients for reference rate reform related activities that impact debt, leases, derivatives and other contracts. The guidance is optional and is effective between March 12, 2020 and December 31, 2022. The guidance may be elected over time as reference rate reform activities occur. During the second quarter of 2022, the Company elected to apply the hedge accounting expedients related to probability and the assessments of effectiveness for future LIBOR-indexed cash flows to assume that the index upon which future hedged transactions will be based matches the index on the corresponding derivatives. In addition, the Company elected to apply the hedge accounting expedients related to changes in critical terms of derivative or hedged transactions, and bilaterally negotiated contract changes for the refinance of the Company's term loan and associated interest rate swap. The Company continues to evaluate the impact of the guidance and may apply elections as applicable as additional changes in the market occur.

ORGANIZATION OF THE PARENT CO_2

ORGANIZATION OF THE PARENT COMPANY AND THE OPERATING PARTNERSHIP (Tables)	6 Months Ended
	Jun. 30, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Summary of Core Portfolio of Operating Properties and Excludes Development, Redevelopment and Held for Sale	The Company’s core portfolio of operating properties (the “Core Properties”) excludes development properties, redevelopment properties, and properties held for sale. The Properties were comprised of the following as of June 30, 2022: Number of Properties Rentable Square Feet Office properties 69 12,054,491 Mixed-use properties 5 942,334 Core Properties 74 12,996,825 Development property 1 205,803 Redevelopment properties 3 436,659 The Properties 78 13,639,287

REAL ESTATE INVESTMENTS (Tables

REAL ESTATE INVESTMENTS (Tables)	6 Months Ended
REAL ESTATE INVESTMENTS (Tables)	Jun. 30, 2022
Real Estate [Abstract]
Schedule of Gross Carrying Value of Operating Properties	As of June 30, 2022 and December 31, 2021, the gross carrying value of the operating properties was as follows (in thousands): June 30, 2022 December 31, 2021 Land $ 410,891 $ 410,144 Building and improvements 2,710,368 2,653,492 Tenant improvements 423,843 408,966 Total $ 3,545,102 $ 3,472,602
Summary of Properties Acquired	The following table summarizes the property acquisitions during the six months ended June 30, 2022 (dollars in thousands): Property/Portfolio Name Acquisition Date Location Property Type Rentable Square Feet/Acres Purchase Price 631 Park Avenue January 21, 2022 King of Prussia, PA Land 3.3 acres $ 3,650 3151 Market Street (a) April 29, 2022 Philadelphia, PA Leasehold Interest 0.8 acres $ 27,349 (a) On April 29, 2022, the Company acquired, through a 99-year ground lease, the leasehold interest in a 0.8-acre land parcel, located at 3151 Market Street, in Philadelphia, Pennsylvania. The Company prepaid $19.5 million of the ground lease, representing 500,000 square feet of buildable floor to area ratio ("FAR") to be used for the development of 3151 Market Street, and paid $7.8 million for 200,000 square feet of FAR density usable pursuant to the Schuylkill Yards Project master development agreement. The ground lease and additional density are included in construction in progress and prepaid leasehold interests in land held for development, respectively, in the consolidated balance sheets. See Note 15, ''Subsequent Events," for further information.
Summary of Properties Sold	The following table summarizes the property dispositions during the six months ended June 30, 2022 (dollars in thousands): Property/Portfolio Name Disposition Date Location Property Type Rentable Square Feet/Acres Sales Price Gain/(Loss) on Sale (a) Gateway G & H January 20, 2022 Richmond, VA Land 10.0 acres $ 1,600 $ 897 25 M Street April 14, 2022 Washington, D.C. Land 0.8 acres $ 29,675 $ 3,436 Gibbsboro Portfolio June 28, 2022 Gibbsboro, NJ Office/Land 42,809/4.0 acres $ 4,100 $ 831 (b) (a) Gain/(Loss) on Sale is net of closing and other transaction related costs. (b) Includes $0.7 million of gain on sale of undepreciated real estate and $0.1 million of gain on disposition of real estate included within the consolidated statements of operations for the six months ended June 30, 2022.

INVESTMENT IN UNCONSOLIDATED _2

INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES (Tables)	6 Months Ended
INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES (Tables)	Jun. 30, 2022
Equity Method Investments and Joint Ventures [Abstract]
Summary of Financial Position of Real Estate Ventures	The following is a summary of the financial position of the unconsolidated real estate ventures in which the Company held interests as of June 30, 2022 and December 31, 2021 (in thousands): June 30, 2022 December 31, 2021 Net property $ 1,962,902 $ 1,563,263 Other assets 516,328 434,687 Other liabilities 415,816 331,947 Debt, net 1,218,561 956,668 Equity (a) 844,853 709,335 (a) This amount does not include 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.
Summary of Results Of Unconsolidated Real Estate Ventures	The following is a summary of results of operations of the unconsolidated real estate ventures in which the Company held interests during the three and six month periods ended June 30, 2022 and 2021 (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2022 2021 2022 2021 Revenue $ 64,957 $ 53,228 $ 118,173 $ 106,585 Operating expenses (31,671) (28,629) (60,263) (57,616) Interest expense, net (11,663) (8,017) (19,132) (15,391) Depreciation and amortization (27,927) (25,500) (49,210) (50,393) Net loss $ (6,304) $ (8,918) $ (10,432) $ (16,815) Ownership interest % Various Various Various Various Company's share of net loss $ (4,822) $ (7,281) $ (9,439) $ (13,822) Basis adjustments and other (159) 41 (105) (342) Equity in loss of unconsolidated real estate ventures $ (4,981) $ (7,240) $ (9,544) $ (14,164)

LEASES (Tables)

LEASES (Tables)	6 Months Ended
LEASES (Tables)	Jun. 30, 2022
Leases [Abstract]
Schedule of Lease Income	The table below sets forth the allocation of lease revenue between fixed contractual payments and variable lease payments for the three and six months ended June 30, 2022 and 2021 (in thousands): Three Months Ended June 30, Six Months Ended June 30, Lease Revenue 2022 2021 2022 2021 Fixed contractual payments $ 88,672 $ 86,117 $ 177,435 $ 172,497 Variable lease payments 25,234 22,060 49,565 46,208 Total $ 113,906 $ 108,177 $ 227,000 $ 218,705

INTANGIBLE ASSETS AND LIABILI_2

INTANGIBLE ASSETS AND LIABILITIES (Tables)	6 Months Ended
INTANGIBLE ASSETS AND LIABILITIES (Tables)	Jun. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of Intangible Assets and Liabilities	As of June 30, 2022 and December 31, 2021, the Company’s intangible assets/liabilities were comprised of the following (in thousands): June 30, 2022 Total Cost Accumulated Amortization Intangible Assets, net Intangible assets, net: In-place lease value $ 59,582 $ (36,770) $ 22,812 Tenant relationship value 167 (100) 67 Above market leases acquired 331 (195) 136 Total intangible assets, net $ 60,080 $ (37,065) $ 23,015 Total Cost Accumulated Amortization Intangible Liabilities, net Intangible liabilities, net: Below market leases acquired $ 22,268 $ (10,991) $ 11,277 December 31, 2021 Total Cost Accumulated Amortization Intangible Assets, net Intangible assets, net: In-place lease value $ 72,376 $ (44,066) $ 28,310 Tenant relationship value 167 (97) 70 Above market leases acquired 486 (310) 176 Total intangible assets, net $ 73,029 $ (44,473) $ 28,556 Total Cost Accumulated Amortization Intangible Liabilities, net Intangible liabilities, net: Below market leases acquired $ 27,025 $ (14,044) $ 12,981
Summary of Amortization for Intangible Assets and Liabilities	As of June 30, 2022, the Company’s annual amortization for its intangible assets/liabilities, assuming no prospective early lease terminations, was as follows (dollars in thousands): Assets Liabilities 2022 (six months remaining) $ 4,100 $ 883 2023 6,724 1,540 2024 4,433 1,321 2025 3,255 1,044 2026 1,195 754 Thereafter 3,308 5,735 Total $ 23,015 $ 11,277

DEBT OBLIGATIONS (Tables)

DEBT OBLIGATIONS (Tables)	6 Months Ended
DEBT OBLIGATIONS (Tables)	Jun. 30, 2022
Debt Disclosure [Abstract]
Schedule of Consolidated Debt Obligations	The following table sets forth information regarding the Company’s consolidated debt obligations outstanding as of June 30, 2022 and December 31, 2021 (in thousands): June 30, 2022 December 31, 2021 Effective Maturity UNSECURED DEBT $600 million Unsecured Credit Facility $ 214,000 $ 23,000 SOFR + 1.15% June 2026 (a) Term Loan - Swapped to fixed 250,000 250,000 2.87% June 2027 (b) $350.0M 3.95% Guaranteed Notes due 2023 350,000 350,000 3.87% February 2023 $350.0M 4.10% Guaranteed Notes due 2024 350,000 350,000 3.78% October 2024 $450.0M 3.95% Guaranteed Notes due 2027 450,000 450,000 4.03% November 2027 $350.0M 4.55% Guaranteed Notes due 2029 350,000 350,000 4.30% October 2029 Indenture IA (Preferred Trust I) 27,062 27,062 LIBOR + 1.25% March 2035 Indenture IB (Preferred Trust I) 25,774 25,774 LIBOR + 1.25% April 2035 Indenture II (Preferred Trust II) 25,774 25,774 LIBOR + 1.25% July 2035 Principal balance outstanding 2,042,610 1,851,610 Plus: original issue premium (discount), net 7,212 8,187 Less: deferred financing costs (7,063) (6,211) Total unsecured indebtedness $ 2,042,759 $ 1,853,586 (a) Spread includes a 10 basis point daily SOFR adjustment. (b) On June 30, 2022, the Company executed the 2022 Credit Agreement (as defined below), that provides for, among other things, the Term Loan (as defined below), which replaced the Company's $250.0 million term loan that had been scheduled to mature on October 22, 2022. As of June 30, 2022, based on the Operating Partnership's unsecured senior debt rating, the applicable margin for the Term Loan was 120.0 basis points, plus a daily SOFR adjustment of 10 basis points. Through a series of interest rate swaps, the $250.0 million principal amount of the Term Loan has a fixed interest rate of 2.87% until October 8, 2022.
Schedule of Maturities of Long-term Debt	As of June 30, 2022, the aggregate scheduled principal payments on the Company's debt obligations were as follows (in thousands): 2022 (six months remaining) $ — 2023 350,000 2024 350,000 2025 — 2026 214,000 Thereafter 1,128,610 Total principal payments 2,042,610 Net unamortized premiums/(discounts) 7,212 Net deferred financing costs (7,063) Outstanding indebtedness $ 2,042,759

FAIR VALUE OF FINANCIAL INSTR_2

FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)	6 Months Ended
FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)	Jun. 30, 2022
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, 2022 December 31, 2021 Carrying Amount (a) Fair Value Carrying Amount (a) Fair Value Unsecured notes payable $ 1,502,102 $ 1,461,960 $ 1,502,368 $ 1,588,780 Variable rate debt $ 540,657 $ 542,610 $ 351,218 $ 344,754 Notes receivable $ 44,430 $ 44,058 $ 44,430 $ 45,230

DERIVATIVE FINANCIAL INSTRUME_2

DERIVATIVE FINANCIAL INSTRUMENTS (Tables)	6 Months Ended
DERIVATIVE FINANCIAL INSTRUMENTS (Tables)	Jun. 30, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value	The following table summarizes the terms and fair values of the Company’s derivative financial instruments as of June 30, 2022 and December 31, 2021. The notional amounts provide an indication of the extent of the Company’s involvement in these instruments at that time, but do not represent exposure to credit, interest rate or market risks (amounts presented in thousands). Hedge Product Hedge Type Designation Notional Amount Strike Trade Date Maturity Date Fair value 6/30/2022 12/31/2021 6/30/2022 12/31/2021 Assets Swap Interest Rate Cash Flow (a) $ 250,000 $ 250,000 2.868 % October 8, 2015 October 8, 2022 $ 415 $ (2,461) $ 250,000 $ 250,000 (a) Hedging unsecured variable rate debt.

BENEFICIARIES' EQUITY OF THE _2

BENEFICIARIES' EQUITY OF THE PARENT COMPANY (Tables)	6 Months Ended
BENEFICIARIES' EQUITY OF THE PARENT COMPANY (Tables)	Jun. 30, 2022
Equity [Abstract]
Schedule of Earnings Per Share (EPS), Basic and Diluted	The following table details 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 Months Ended June 30, 2022 2021 Basic Diluted Basic Diluted Numerator Net income $ 4,651 $ 4,651 $ (175) $ (175) Net (income) loss attributable to noncontrolling interests (14) (14) 8 8 Nonforfeitable dividends allocated to unvested restricted shareholders (98) (98) (94) (94) Net income (loss) attributable to common shareholders $ 4,539 $ 4,539 $ (261) $ (261) Denominator Weighted-average shares outstanding 171,527,031 171,527,031 170,848,894 170,848,894 Contingent securities/Share based compensation — 733,398 — — Weighted-average shares outstanding 171,527,031 172,260,429 170,848,894 170,848,894 Earnings per Common Share: Net income attributable to common shareholders $ 0.03 $ 0.03 $ — $ — Six Months Ended June 30, 2022 2021 Basic Diluted Basic Diluted Numerator Net income $ 10,752 $ 10,752 $ 6,789 $ 6,789 Net income attributable to noncontrolling interests (22) (22) (35) (35) Nonforfeitable dividends allocated to unvested restricted shareholders (246) (246) (240) (240) Net income attributable to common shareholders $ 10,484 $ 10,484 $ 6,514 $ 6,514 Denominator Weighted-average shares outstanding 171,411,631 171,411,631 170,737,437 170,737,437 Contingent securities/Share based compensation — 1,163,777 — 1,258,682 Weighted-average shares outstanding 171,411,631 172,575,408 170,737,437 171,996,119 Earnings per Common Share: Net income attributable to common shareholders $ 0.06 $ 0.06 $ 0.04 $ 0.04 The following table details 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 Months Ended June 30, 2022 2021 Basic Diluted Basic Diluted Numerator Net income (loss) $ 4,651 $ 4,651 $ (175) $ (175) Net loss attributable to noncontrolling interests 2 2 1 1 Nonforfeitable dividends allocated to unvested restricted unitholders (98) (98) (94) (94) Net income (loss) attributable to common unitholders $ 4,555 $ 4,555 $ (268) $ (268) Denominator Weighted-average units outstanding 172,043,498 172,043,498 171,792,415 171,792,415 Contingent securities/Share based compensation — 733,398 — — Total weighted-average units outstanding 172,043,498 172,776,896 171,792,415 171,792,415 Earnings per Common Partnership Unit: Net income attributable to common unitholders $ 0.03 $ 0.03 $ — $ — Six Months Ended June 30, 2022 2021 Basic Diluted Basic Diluted Numerator Net income $ 10,752 $ 10,752 $ 6,789 $ 6,789 Net loss attributable to noncontrolling interests 4 4 2 2 Nonforfeitable dividends allocated to unvested restricted unitholders (246) (246) (240) (240) Net income attributable to common unitholders $ 10,510 $ 10,510 $ 6,551 $ 6,551 Denominator Weighted-average units outstanding 171,985,863 171,985,863 171,699,909 171,699,909 Contingent securities/Share based compensation — 1,163,777 — 1,258,682 Total weighted-average units outstanding 171,985,863 173,149,640 171,699,909 172,958,591 Earnings per Common Partnership Unit: Net income attributable to common unitholders $ 0.06 $ 0.06 $ 0.04 $ 0.04

PARTNERS' EQUITY OF THE PAREN_2

PARTNERS' EQUITY OF THE PARENT COMPANY (Tables)	6 Months Ended
PARTNERS' EQUITY OF THE PARENT COMPANY (Tables)	Jun. 30, 2022
Equity [Abstract]
Schedule of Earnings Per Share (EPS), Basic and Diluted	The following table details 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 Months Ended June 30, 2022 2021 Basic Diluted Basic Diluted Numerator Net income $ 4,651 $ 4,651 $ (175) $ (175) Net (income) loss attributable to noncontrolling interests (14) (14) 8 8 Nonforfeitable dividends allocated to unvested restricted shareholders (98) (98) (94) (94) Net income (loss) attributable to common shareholders $ 4,539 $ 4,539 $ (261) $ (261) Denominator Weighted-average shares outstanding 171,527,031 171,527,031 170,848,894 170,848,894 Contingent securities/Share based compensation — 733,398 — — Weighted-average shares outstanding 171,527,031 172,260,429 170,848,894 170,848,894 Earnings per Common Share: Net income attributable to common shareholders $ 0.03 $ 0.03 $ — $ — Six Months Ended June 30, 2022 2021 Basic Diluted Basic Diluted Numerator Net income $ 10,752 $ 10,752 $ 6,789 $ 6,789 Net income attributable to noncontrolling interests (22) (22) (35) (35) Nonforfeitable dividends allocated to unvested restricted shareholders (246) (246) (240) (240) Net income attributable to common shareholders $ 10,484 $ 10,484 $ 6,514 $ 6,514 Denominator Weighted-average shares outstanding 171,411,631 171,411,631 170,737,437 170,737,437 Contingent securities/Share based compensation — 1,163,777 — 1,258,682 Weighted-average shares outstanding 171,411,631 172,575,408 170,737,437 171,996,119 Earnings per Common Share: Net income attributable to common shareholders $ 0.06 $ 0.06 $ 0.04 $ 0.04 The following table details 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 Months Ended June 30, 2022 2021 Basic Diluted Basic Diluted Numerator Net income (loss) $ 4,651 $ 4,651 $ (175) $ (175) Net loss attributable to noncontrolling interests 2 2 1 1 Nonforfeitable dividends allocated to unvested restricted unitholders (98) (98) (94) (94) Net income (loss) attributable to common unitholders $ 4,555 $ 4,555 $ (268) $ (268) Denominator Weighted-average units outstanding 172,043,498 172,043,498 171,792,415 171,792,415 Contingent securities/Share based compensation — 733,398 — — Total weighted-average units outstanding 172,043,498 172,776,896 171,792,415 171,792,415 Earnings per Common Partnership Unit: Net income attributable to common unitholders $ 0.03 $ 0.03 $ — $ — Six Months Ended June 30, 2022 2021 Basic Diluted Basic Diluted Numerator Net income $ 10,752 $ 10,752 $ 6,789 $ 6,789 Net loss attributable to noncontrolling interests 4 4 2 2 Nonforfeitable dividends allocated to unvested restricted unitholders (246) (246) (240) (240) Net income attributable to common unitholders $ 10,510 $ 10,510 $ 6,551 $ 6,551 Denominator Weighted-average units outstanding 171,985,863 171,985,863 171,699,909 171,699,909 Contingent securities/Share based compensation — 1,163,777 — 1,258,682 Total weighted-average units outstanding 171,985,863 173,149,640 171,699,909 172,958,591 Earnings per Common Partnership Unit: Net income attributable to common unitholders $ 0.06 $ 0.06 $ 0.04 $ 0.04

SEGMENT INFORMATION (Tables)

SEGMENT INFORMATION (Tables)	6 Months Ended
SEGMENT INFORMATION (Tables)	Jun. 30, 2022
Segment Reporting [Abstract]
Schedule of Real Estate Investments, Net Operating Income and Unconsolidated Real Estate Ventures of Reportable Segments	The following tables provide selected asset information and results of operations of the Company's reportable segments (in thousands): Real estate investments, at cost: June 30, 2022 December 31, 2021 Philadelphia CBD $ 1,506,350 $ 1,460,510 Pennsylvania Suburbs 870,510 866,223 Austin, Texas 794,734 778,145 Metropolitan Washington, D.C. 287,215 280,921 Other 86,293 86,803 Operating Properties $ 3,545,102 $ 3,472,602 Corporate Right of use asset - operating leases, net $ 19,988 $ 20,313 Construction-in-progress $ 366,823 $ 277,237 Land held for development $ 93,887 $ 114,604 Prepaid leasehold interests in land held for development, net $ 35,576 $ 27,762 Net operating income: Three Months Ended June 30, 2022 2021 Total revenue Operating expenses (a) Net operating income Total revenue Operating expenses (a) Net operating income Philadelphia CBD $ 55,426 $ (20,538) $ 34,888 $ 51,445 $ (18,259) $ 33,186 Pennsylvania Suburbs 31,333 (10,258) 21,075 30,294 (9,777) 20,517 Austin, Texas 23,921 (10,438) 13,483 25,513 (9,962) 15,551 Metropolitan Washington, D.C. 5,486 (3,116) 2,370 4,812 (3,902) 910 Other 3,919 (2,342) 1,577 3,662 (2,528) 1,134 Corporate 3,957 (2,957) 1,000 4,376 (2,999) 1,377 Operating properties $ 124,042 $ (49,649) $ 74,393 $ 120,102 $ (47,427) $ 72,675 Six Months Ended June 30, 2022 2021 Total revenue Operating expenses (a) Net operating income Total revenue Operating expenses (a) Net operating income Philadelphia CBD $ 108,897 $ (40,281) $ 68,616 $ 102,672 $ (35,670) 67,002 Pennsylvania Suburbs 63,140 (20,416) 42,724 62,034 (20,471) 41,563 Austin, Texas 48,836 (20,731) 28,105 51,688 (19,682) 32,006 Metropolitan Washington, D.C. 10,681 (6,544) 4,137 9,487 (8,101) 1,386 Other 7,523 (4,352) 3,171 6,875 (4,810) 2,065 Corporate 12,470 (5,243) 7,227 8,115 (5,367) 2,748 Operating properties $ 251,547 $ (97,567) $ 153,980 $ 240,871 $ (94,101) $ 146,770 Unconsolidated real estate ventures: Investment in real estate ventures Equity in income (loss) of real estate venture As of Three Months Ended June 30, June 30, 2022 December 31, 2021 2022 2021 Philadelphia CBD $ 341,748 $ 317,959 $ (2,574) $ (4,661) Metropolitan Washington, D.C. 85,614 85,867 (381) (778) Mid-Atlantic Office JV 31,478 31,680 (101) 117 MAP Venture (29,594) (24,396) (1,925) (1,918) Total $ 429,246 $ 411,110 $ (4,981) $ (7,240)
Schedule of Reconciliation of Consolidated Net Income to Consolidated NOI	The following is a reconciliation of consolidated net income (loss), as defined by GAAP, to consolidated NOI, (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2022 2021 2022 2021 Net income (loss) $ 4,651 $ (175) $ 10,752 $ 6,789 Plus: Interest expense 16,341 15,490 32,083 31,783 Interest expense - amortization of deferred financing costs 805 709 1,514 1,418 Depreciation and amortization 43,959 42,785 87,741 83,128 General and administrative expenses 8,328 8,356 18,328 14,940 Equity in loss of unconsolidated real estate ventures 4,981 7,240 9,544 14,164 Less: Interest and investment income 449 1,677 889 3,351 Income tax provision (48) (15) (75) (34) Net gain on disposition of real estate 144 68 144 142 Net gain on sale of undepreciated real estate 4,127 — 5,024 1,993 Consolidated net operating income $ 74,393 $ 72,675 $ 153,980 $ 146,770

ORGANIZATION OF THE PARENT CO_3

ORGANIZATION OF THE PARENT COMPANY AND THE OPERATING PARTNERSHIP- Narrative (Details)	6 Months Ended
	Jun. 30, 2022 a ft² property parcel
Organization of The Parent Company and The Operating Partnership [Line Items]
Number of real estate properties \| property	78
Rentable area (in square feet)	13,639,287
Unconsolidated Properties \| Unconsolidated Real Estate Ventures
Organization of The Parent Company and The Operating Partnership [Line Items]
Number of real estate properties \| property	10
Parent Company
Organization of The Parent Company and The Operating Partnership [Line Items]
Areas of land held for development (in acres) \| a	164.6
Lease agreement term	99 years
Area of additional undeveloped parcels of land with option to purchase (in acres) \| a	54.7
Total potential development capacity (in square feet)	13,100,000
Parent Company \| Parcel of land
Organization of The Parent Company and The Operating Partnership [Line Items]
Lease agreement term	99 years
Parent Company \| Leashold Interest Land
Organization of The Parent Company and The Operating Partnership [Line Items]
Areas of land held for development (in acres) \| a	1.6
Number of parcels of land \| parcel	2
Wholly-owned Management Company Subsidiaries
Organization of The Parent Company and The Operating Partnership [Line Items]
Rentable area (in square feet)	23,000,000
Wholly-owned Management Company Subsidiaries \| Wholly Owned Properties
Organization of The Parent Company and The Operating Partnership [Line Items]
Rentable area (in square feet)	13,600,000
Wholly-owned Management Company Subsidiaries \| Partially Owned Properties
Organization of The Parent Company and The Operating Partnership [Line Items]
Rentable area (in square feet)	9,400,000
Brandywine Operating Partnership LP
Organization of The Parent Company and The Operating Partnership [Line Items]
Ownership in the operating partnership	99.70%

ORGANIZATION OF THE PARENT CO_4

ORGANIZATION OF THE PARENT COMPANY AND THE OPERATING PARTNERSHIP - Summary of Core Portfolio of Operating Properties and Excludes Development, Redevelopment and Held for Sale (Details)	Jun. 30, 2022 ft² property
Real Estate Properties [Line Items]
Number of Properties \| property	78
Rentable area (in square feet) \| ft²	13,639,287
Core Properties
Real Estate Properties [Line Items]
Number of Properties \| property	74
Rentable area (in square feet) \| ft²	12,996,825
Office properties
Real Estate Properties [Line Items]
Number of Properties \| property	69
Rentable area (in square feet) \| ft²	12,054,491
Mixed-use properties
Real Estate Properties [Line Items]
Number of Properties \| property	5
Rentable area (in square feet) \| ft²	942,334
Development property
Real Estate Properties [Line Items]
Number of Properties \| property	1
Rentable area (in square feet) \| ft²	205,803
Redevelopment properties
Real Estate Properties [Line Items]
Number of Properties \| property	3
Rentable area (in square feet) \| ft²	436,659

REAL ESTATE INVESTMENTS - Gross

REAL ESTATE INVESTMENTS - Gross Carrying Value of Operating Properties (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Real Estate [Abstract]
Land	$ 410,891	$ 410,144
Building and improvements	2,710,368	2,653,492
Tenant improvements	423,843	408,966
Total	$ 3,545,102	$ 3,472,602

REAL ESTATE INVESTMENTS - Summa

REAL ESTATE INVESTMENTS - Summary of Properties Acquired (Details) $ in Thousands			6 Months Ended
	Apr. 29, 2022 USD ($)	Jan. 21, 2022 USD ($) a	Jun. 30, 2022 USD ($) ft²	Jun. 30, 2021 USD ($)	Apr. 29, 2022 ft²	Apr. 29, 2022 a
Real Estate [Line Items]
Purchase Price			$ 3,446	$ 0
Rentable area (in square feet) \| ft²			13,639,287
Land \| 631 Park Avenue
Real Estate [Line Items]
Rentable Square Feet/Acres \| a		3.3
Purchase Price		$ 3,650
Land \| 3151 Market Street
Real Estate [Line Items]
Rentable Square Feet/Acres					0.8	0.8
Purchase Price	$ 27,349
Lease agreement term	99 years
Prepaid rent	$ 19,500
Rentable area (in square feet) \| ft²					500,000
Operating lease costs, capitalized	$ 7,800
Land \| Schuylkill Yards Project
Real Estate [Line Items]
Rentable area (in square feet) \| ft²					200,000

REAL ESTATE INVESTMENTS - Sum_2

REAL ESTATE INVESTMENTS - Summary of Property Dispositions (Details) $ in Thousands				3 Months Ended		6 Months Ended
	Jun. 28, 2022 USD ($)	Apr. 14, 2022 USD ($) a	Jan. 20, 2022 USD ($) a	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 28, 2022 a	Jun. 28, 2022 ft²
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net gain on disposition of real estate				$ 144	$ 68	$ 144	$ 142
Net gain on sale of undepreciated real estate				$ 4,127	$ 0	5,024	$ 1,993
Land \| Gateway G & H
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Rentable Square Feet/Acres \| a			10
Sales Price			$ 1,600
Net gain on disposition of real estate			$ 897
Land \| 25 M Street
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Rentable Square Feet/Acres \| a		0.8
Sales Price		$ 29,675
Net gain on disposition of real estate		$ 3,436
Land \| Gibbsboro Portfolio
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net gain on disposition of real estate	$ 700
Office/Land \| Gibbsboro Portfolio
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Rentable Square Feet/Acres								4	42,809
Sales Price	4,100
Net gain on disposition of real estate	$ 831
Office properties \| Gibbsboro Portfolio
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net gain on disposition of real estate						$ 100

REAL ESTATE INVESTMENTS - Narra

REAL ESTATE INVESTMENTS - Narrative (Details) $ in Thousands		6 Months Ended
	Jul. 29, 2022 USD ($) loan	Jun. 30, 2022 USD ($) ft² property	Jul. 28, 2022 loan	Dec. 31, 2021 USD ($)	Dec. 01, 2021 USD ($) ft² property apartment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Investment in real estate ventures		$ 429,246		$ 411,110
Rentable area (in square feet) \| ft²		13,639,287
Principal balance outstanding		$ 2,042,610
Unsecured Debt
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Principal balance outstanding		2,042,610		1,851,610
Unsecured Debt \| $600 million Unsecured Credit Facility
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Principal balance outstanding		$ 214,000		$ 23,000
Unsecured Debt \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate \| $600 million Unsecured Credit Facility
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Spread on variable rate		1.15%
Unsecured Debt \| Daily SOFR Adjustment \| $600 million Unsecured Credit Facility
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Spread on variable rate		0.10%
One Uptown Venture
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Investment in real estate ventures					$ 328,400
Number of apartment residence \| apartment					341
Joint venture, funding committed by other party					$ 61,000
Construction loan, percentage of total cost		63%
One Uptown Venture \| Subsequent Event \| Carry Guarantee \| Loans Payable
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Guarantee percent	30%
One Uptown Venture \| Subsequent Event \| Limited Payment Guarantee \| Loans Payable
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Guarantee percent	15%
One Uptown Venture \| Construction Loans
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Principal balance outstanding		$ 206,700
One Uptown Venture \| Construction Loans \| Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Principal balance outstanding	$ 121,700
Number of loans closed \| loan	2		2
One Uptown Venture \| Construction Loans \| Subsequent Event \| Multifamily Joint Venture
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Principal balance outstanding	$ 85,000
One Uptown Venture \| Construction Loans \| Subsequent Event \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Spread on variable rate	3%
One Uptown Venture \| Construction Loans \| Subsequent Event \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate \| Multifamily Joint Venture
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Spread on variable rate	2.45%
One Uptown Venture \| Preferred Stock
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity method investment, ownership percentage					50%
One Uptown Venture \| Common Stock
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity method investment, ownership percentage					50%
One Uptown Venture \| Class A Workspace
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Rentable area (in square feet) \| ft²					348,000
One Uptown Venture \| Street Level Retail
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Rentable area (in square feet) \| ft²					15,000
Canyon Partners Real Estate \| One Uptown Venture
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of joint ventures \| property		2			2

INVESTMENT IN UNCONSOLIDATED _3

INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES - Narrative (Details) $ in Thousands		3 Months Ended		6 Months Ended
	Mar. 17, 2022 USD ($) ft²	Jun. 30, 2022 USD ($) a ft² property apartment	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) a ft² property apartment	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Schedule of Equity Method Investments [Line Items]
Number of real estate properties \| property		78		78
Investment in unconsolidated real estate ventures		$ 458,840		$ 458,840		$ 435,506
Accounts receivable		$ 13,584		$ 13,584		11,875
Rentable area (in square feet) \| ft²		13,639,287		13,639,287
Purchase price				$ 3,446	$ 0
Real Estate Venture
Schedule of Equity Method Investments [Line Items]
Accounts receivable		$ 2,800		2,800		$ 2,500
Management Fees \| Real Estate Venture
Schedule of Equity Method Investments [Line Items]
Service and other revenue		2,100	$ 2,100	4,000	4,100
Leasing Commission Income \| Real Estate Venture
Schedule of Equity Method Investments [Line Items]
Service and other revenue		800	$ 600	1,100	$ 1,900
Unconsolidated Real Estate Ventures
Schedule of Equity Method Investments [Line Items]
Investment in unconsolidated real estate ventures		$ 429,300		$ 429,300
Unconsolidated Real Estate Ventures \| Minimum
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage		15%		15%
Unconsolidated Real Estate Ventures \| Maximum
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage		70%		70%
Unconsolidated Real Estate Ventures \| Office properties
Schedule of Equity Method Investments [Line Items]
Number of unconsolidated investments in Real Estate Ventures \| property		5		5
Rentable area (in square feet) \| ft²		9,100,000		9,100,000
Unconsolidated Real Estate Ventures \| Other Liabilities
Schedule of Equity Method Investments [Line Items]
Investment in unconsolidated real estate ventures		$ 29,600		$ 29,600
Unconsolidated Real Estate Ventures \| Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
Number of real estate properties \| property		10		10
Number of properties with negative investment balances \| property		1		1
Unconsolidated Real Estate Ventures \| Land Held For Development
Schedule of Equity Method Investments [Line Items]
Number of unconsolidated investments in Real Estate Ventures \| property		2		2
Area of land (in acres) \| a		1.4		1.4
Unconsolidated Real Estate Ventures \| Land Under Active Development
Schedule of Equity Method Investments [Line Items]
Number of unconsolidated investments in Real Estate Ventures \| property		1		1
Area of land (in acres) \| a		1		1
Unconsolidated Real Estate Ventures \| Mixed Use Tower
Schedule of Equity Method Investments [Line Items]
Number of unconsolidated investments in Real Estate Ventures \| property		1		1
Rentable area (in square feet) \| ft²		200,000		200,000
Number of apartment units (in units) \| apartment		250		250
Unconsolidated Real Estate Ventures \| Residential Tower
Schedule of Equity Method Investments [Line Items]
Number of unconsolidated investments in Real Estate Ventures \| property		1		1
Number of apartment units (in units) \| apartment		321		321
Cira Square REIT, LLC
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	20%
Gross purchase price	$ 383,000
Purchase price	$ 28,600
Cira Square REIT, LLC \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Schedule of Equity Method Investments [Line Items]
Spread on variable rate	3.50%
Cira Square REIT, LLC \| Secured Debt
Schedule of Equity Method Investments [Line Items]
Debt instrument, face amount	$ 257,700
Cira Square REIT, LLC \| Office properties
Schedule of Equity Method Investments [Line Items]
Rentable area (in square feet) \| ft²	862,692

INVESTMENT IN UNCONSOLIDATED _4

INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES - Summary of Financial Position of Real Estate Ventures (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Net property	$ 3,052,268		$ 2,955,068
Other assets	124,486		133,094
Other liabilities	52,359		48,683
Debt, net	2,042,759
Equity	1,651,563	$ 1,675,863	1,701,219	$ 1,751,053	$ 1,782,254	$ 1,804,648
Investment In Nonconsolidated Real Estate
Schedule of Equity Method Investments [Line Items]
Net property	1,962,902		1,563,263
Other assets	516,328		434,687
Other liabilities	415,816		331,947
Debt, net	1,218,561		956,668
Equity	$ 844,853		$ 709,335

INVESTMENT IN UNCONSOLIDATED _5

INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES - Summary of Results of Operations of Real Estate Ventures with Interests (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Schedule of Equity Method Investments [Line Items]
Revenue	$ 124,042		$ 120,102		$ 251,547	$ 240,871
Operating expenses	(101,936)		(98,568)		(203,636)	(192,169)
Interest expense, net	(16,341)		(15,490)		(32,083)	(31,783)
Depreciation and amortization	(43,959)		(42,785)		(87,741)	(83,128)
Net income (loss)	4,651	$ 6,101	(175)	$ 6,964	10,752	6,789
Equity in loss of unconsolidated real estate ventures	(4,981)		(7,240)		(9,544)	(14,164)
Investment In Nonconsolidated Real Estate
Schedule of Equity Method Investments [Line Items]
Revenue	64,957		53,228		118,173	106,585
Operating expenses	(31,671)		(28,629)		(60,263)	(57,616)
Interest expense, net	(11,663)		(8,017)		(19,132)	(15,391)
Depreciation and amortization	(27,927)		(25,500)		(49,210)	(50,393)
Net income (loss)	(6,304)		(8,918)		(10,432)	(16,815)
Company's share of net loss	(4,822)		(7,281)		(9,439)	(13,822)
Basis adjustments and other	$ (159)		$ 41		$ (105)	$ (342)

LEASES (Details)

LEASES (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
LEASES (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Leases [Abstract]
Fixed contractual payments	$ 88,672	$ 86,117	$ 177,435	$ 172,497
Variable lease payments	25,234	22,060	49,565	46,208
Total	$ 113,906	$ 108,177	$ 227,000	$ 218,705

INTANGIBLE ASSETS AND LIABILI_3

INTANGIBLE ASSETS AND LIABILITIES - Intangible Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Intangible Assets [Line Items]
Intangible assets, total cost	$ 60,080	$ 73,029
Intangible assets, accumulated amortization	(37,065)	(44,473)
Intangible Assets, net	23,015	28,556
Intangible liabilities, total cost	22,268	27,025
Intangible liabilities, accumulated amortization	(10,991)	(14,044)
Intangible Liabilities, net	11,277	12,981
In-place lease value
Intangible Assets [Line Items]
Intangible assets, total cost	59,582	72,376
Intangible assets, accumulated amortization	(36,770)	(44,066)
Intangible Assets, net	22,812	28,310
Tenant relationship value
Intangible Assets [Line Items]
Intangible assets, total cost	167	167
Intangible assets, accumulated amortization	(100)	(97)
Intangible Assets, net	67	70
Above market leases acquired
Intangible Assets [Line Items]
Intangible assets, total cost	331	486
Intangible assets, accumulated amortization	(195)	(310)
Intangible Assets, net	$ 136	$ 176

INTANGIBLE ASSETS AND LIABILI_4

INTANGIBLE ASSETS AND LIABILITIES - Annual Amortization of Intangible Assets, Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Assets
2022 (six months remaining)	$ 4,100
2023	6,724
2024	4,433
2025	3,255
2026	1,195
Thereafter	3,308
Intangible Assets, net	23,015	$ 28,556
Liabilities
2022 (six months remaining)	883
2023	1,540
2024	1,321
2025	1,044
2026	754
Thereafter	5,735
Intangible Liabilities, net	$ 11,277	$ 12,981

DEBT OBLIGATIONS - Consolidated

DEBT OBLIGATIONS - Consolidated Debt Obligations Outstanding (Details) - USD ($)	6 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Consolidated debt obligations
Principal balance outstanding	$ 2,042,610,000
Plus: original issue premium (discount), net	(7,212,000)
Less: deferred financing costs	(7,063,000)
Debt, net	2,042,759,000
Unsecured Debt
Consolidated debt obligations
Principal balance outstanding	2,042,610,000	$ 1,851,610,000
Plus: original issue premium (discount), net	7,212,000	8,187,000
Less: deferred financing costs	(7,063,000)	(6,211,000)
Debt, net	2,042,759,000	1,853,586,000
Unsecured Debt \| $600 million Unsecured Credit Facility
Consolidated debt obligations
Debt instrument, face amount	600,000,000
Principal balance outstanding	$ 214,000,000	23,000,000
Unsecured Debt \| $600 million Unsecured Credit Facility \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Consolidated debt obligations
Spread on variable rate	1.15%
Unsecured Debt \| $600 million Unsecured Credit Facility \| Daily SOFR Adjustment
Consolidated debt obligations
Spread on variable rate	0.10%
Unsecured Debt \| Term loan
Consolidated debt obligations
Principal balance outstanding	$ 250,000,000	250,000,000
Spread on variable rate	1.20%
Effective interest rate	2.87%
Unsecured Debt \| Term loan \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Consolidated debt obligations
Spread on variable rate	1.20%
Unsecured Debt \| $350.0M 3.95% Guaranteed Notes due 2023
Consolidated debt obligations
Debt instrument, face amount	$ 350,000,000
Debt instrument, interest rate, stated percentage	3.95%
Principal balance outstanding	$ 350,000,000	350,000,000
Effective interest rate	3.87%
Unsecured Debt \| $350.0M 4.10% Guaranteed Notes due 2024
Consolidated debt obligations
Debt instrument, face amount	$ 350,000,000
Debt instrument, interest rate, stated percentage	4.10%
Principal balance outstanding	$ 350,000,000	350,000,000
Effective interest rate	3.78%
Unsecured Debt \| $450.0M 3.95% Guaranteed Notes due 2027
Consolidated debt obligations
Debt instrument, face amount	$ 450,000,000
Debt instrument, interest rate, stated percentage	3.95%
Principal balance outstanding	$ 450,000,000	450,000,000
Effective interest rate	4.03%
Unsecured Debt \| $350.0M 4.55% Guaranteed Notes due 2029
Consolidated debt obligations
Debt instrument, face amount	$ 350,000,000
Debt instrument, interest rate, stated percentage	4.55%
Principal balance outstanding	$ 350,000,000	350,000,000
Effective interest rate	4.30%
Unsecured Debt \| Indenture IA (Preferred Trust I)
Consolidated debt obligations
Principal balance outstanding	$ 27,062,000	27,062,000
Unsecured Debt \| Indenture IA (Preferred Trust I) \| LIBOR
Consolidated debt obligations
Spread on variable rate	1.25%
Unsecured Debt \| Indenture IB (Preferred Trust I)
Consolidated debt obligations
Principal balance outstanding	$ 25,774,000	25,774,000
Unsecured Debt \| Indenture IB (Preferred Trust I) \| LIBOR
Consolidated debt obligations
Spread on variable rate	1.25%
Unsecured Debt \| Indenture II (Preferred Trust II)
Consolidated debt obligations
Principal balance outstanding	$ 25,774,000	$ 25,774,000
Unsecured Debt \| Indenture II (Preferred Trust II) \| LIBOR
Consolidated debt obligations
Spread on variable rate	1.25%

DEBT OBLIGATIONS - Narrative (D

DEBT OBLIGATIONS - Narrative (Details)	6 Months Ended
DEBT OBLIGATIONS - Narrative (Details)	Jun. 30, 2022 USD ($) property	Dec. 31, 2021 USD ($)
Debt Instrument [Line Items]
Principal balance outstanding	$ 2,042,610,000
Letters of credit outstanding	4,300,000
Line of Credit \| Term loan
Debt Instrument [Line Items]
Capitalized financing costs	2,000,000
Unsecured Debt
Debt Instrument [Line Items]
Principal balance outstanding	2,042,610,000	$ 1,851,610,000
Unsecured Debt \| Term loan
Debt Instrument [Line Items]
Principal balance outstanding	$ 250,000,000	$ 250,000,000
Spread on variable rate	1.20%
Unsecured Debt \| Term loan \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Spread on variable rate	1.20%
Unsecured Debt \| Term loan \| Minimum \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Spread on variable rate	0.80%
Unsecured Debt \| Term loan \| Minimum \| Base Rate
Debt Instrument [Line Items]
Spread on variable rate	0%
Unsecured Debt \| Term loan \| Maximum \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Spread on variable rate	1.60%
Unsecured Debt \| Term loan \| Maximum \| Base Rate
Debt Instrument [Line Items]
Spread on variable rate	0.60%
Letter of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity (up to)	$ 50,000,000
Revolving Credit Facility \| Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity (up to)	600,000,000
Capitalized financing costs	4,700,000
Line of credit facility, accordion feature	$ 500,000,000
Spread on variable rate	0.25%
Weighted average interest rate	1.72%
Interest expense	$ 1,200,000
Available borrowings under its unsecured credit facility	$ 381,700,000
Revolving Credit Facility \| Line of Credit \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Spread on variable rate	1.05%
Revolving Credit Facility \| Line of Credit \| Minimum \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Spread on variable rate	0.725%
Revolving Credit Facility \| Line of Credit \| Minimum \| Base Rate
Debt Instrument [Line Items]
Spread on variable rate	0%
Revolving Credit Facility \| Line of Credit \| Maximum \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Spread on variable rate	1.40%
Revolving Credit Facility \| Line of Credit \| Maximum \| Base Rate
Debt Instrument [Line Items]
Spread on variable rate	0.40%
Revolving Credit Facility \| Line of Credit \| 2022 Credit Facility
Debt Instrument [Line Items]
Maturity period \| property	2
Extension term	6 months
Line of credit facility covenant minimum fixed charge coverage ratio	1.5
Line of credit facility covenant maximum leverage ratio	0.60
Line of credit facility covenant maximum unsecured indebtedness to unencumbered asset value ratio	0.60
Line of credit facility covenant maximum secured indebtedness to asset value ratio	0.40
Line of credit facility covenant minimum unencumbered cash flow to interest expense on unsecured debt ratio	1.75
Line of credit facility covenant maximum percent of payments of dividends and distributions	0.95

DEBT OBLIGATIONS - Aggregate Sc

DEBT OBLIGATIONS - Aggregate Scheduled Principal Payments of Debt Obligation, Excluding Amortization of Discounts and Premiums (Details) $ in Thousands	Jun. 30, 2022 USD ($)
Debt Disclosure [Abstract]
2022 (six months remaining)	$ 0
2023	350,000
2024	350,000
2025	0
2026	214,000
Thereafter	1,128,610
Total principal payments	2,042,610
Net unamortized premiums/(discounts)	7,212
Net deferred financing costs	(7,063)
Outstanding indebtedness	$ 2,042,759

FAIR VALUE OF FINANCIAL INSTR_3

FAIR VALUE OF FINANCIAL INSTRUMENTS - Financial Instruments for which Estimates of Fair Value Differ from Carrying Amounts (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deferred financing costs, net	$ 7,063
Unsecured notes payable
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deferred financing costs, net	7,063	$ 6,211
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes receivable	44,430	44,430
Carrying Amount \| Unsecured notes payable
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unsecured notes payable	1,502,102	1,502,368
Deferred financing costs, net	5,100	5,800
Carrying Amount \| Variable rate debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Variable rate debt	540,657	351,218
Deferred financing costs, net	2,000	400
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes receivable, fair value	44,058	45,230
Fair Value \| Unsecured notes payable
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instrument, fair value	1,461,960	1,588,780
Fair Value \| Variable rate debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instrument, fair value	$ 542,610	$ 344,754

DERIVATIVE FINANCIAL INSTRUME_3

DERIVATIVE FINANCIAL INSTRUMENTS (Details) - USD ($)	Jun. 30, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Notional Amount	$ 250,000,000	$ 250,000,000
Swap \| Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Notional Amount	$ 250,000,000	250,000,000
Strike	2.868%
Fair value	$ 415,000
Fair value		$ (2,461,000)

LIMITED PARTNERS' NONCONTROLL_2

LIMITED PARTNERS' NONCONTROLLING INTERESTS IN THE PARENT COMPANY (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Redemption of limited partnership units	$ 4,006	$ 2,234
Aggregate amount related to non-controlling interests classified within equity	5,000		$ 8,200
Settlement value of non controlling interest in operating partnership	$ 5,100		$ 11,100
General Partner Capital
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Repurchase and retirement of LP units (in shares)	307,516

BENEFICIARIES' EQUITY OF THE _3

BENEFICIARIES' EQUITY OF THE PARENT COMPANY - Number of Shares and Net Income Used to Calculate Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Numerator
Net income	$ 4,651	$ 6,101	$ (175)	$ 6,964	$ 10,752	$ 6,789
Net (income) loss attributable to noncontrolling interests, Basic	(14)		8		(22)	(35)
Net (income) loss attributable to noncontrolling interests, Diluted	(14)		8		(22)	(35)
Nonforfeitable dividends allocated to unvested restricted shareholders, Basic	(98)		(94)		(246)	(240)
Nonforfeitable dividends allocated to unvested restricted shareholders, Diluted	(98)		(94)		(246)	(240)
Net income (loss) attributable to Common Partnership Unitholders of Brandywine Operating Partnership, L.P.	4,539		(261)		10,484	6,514
Net income (loss) attributable to common shareholders, diluted	$ 4,539		$ (261)		$ 10,484	$ 6,514
Denominator
Weighted average units outstanding, basic (in shares)	171,527,031		170,848,894		171,411,631	170,737,437
Contingent securities/Share based compensation (in shares)	733,398		0		1,163,777	1,258,682
Weighted average units outstanding, diluted (in shares)	172,260,429		170,848,894		172,575,408	171,996,119
Earnings per Common Share:
Net income attributable to common shareholders, Basic (in dollars per share)	$ 0.03		$ 0		$ 0.06	$ 0.04
Net income attributable to common shareholders, Diluted (in dollars per share)	$ 0.03		$ 0		$ 0.06	$ 0.04

BENEFICIARIES' EQUITY OF THE _4

BENEFICIARIES' EQUITY OF THE PARENT COMPANY - Narrative (Details) - USD ($)			3 Months Ended				6 Months Ended
	Jul. 20, 2022	May 18, 2022	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021	Jan. 03, 2019
Class of Stock [Line Items]
Distributions declared (in dollars per share)		$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19
Dividends, common stock		$ 32,800,000
Stock repurchase program, authorized amount									$ 150,000,000
Shares repurchased and retired (in shares)							0	0
Subsequent Event
Class of Stock [Line Items]
Dividends paid in cash (in dollars per share)	$ 0.19
Redeemable Common Limited Partnership Units
Class of Stock [Line Items]
Redeemable common limited partnership units (in shares)							516,467	823,983

PARTNERS' EQUITY OF THE PAREN_3

PARTNERS' EQUITY OF THE PARENT COMPANY- Number of Units and Net Income Used to Calculate Basic and Diluted Earnings Per Common Partnership Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Numerator
Net income (loss)	$ 4,651	$ 6,101	$ (175)	$ 6,964	$ 10,752	$ 6,789
Nonforfeitable dividends allocated to unvested restricted shareholders, Basic	(98)		(94)		(246)	(240)
Nonforfeitable dividends allocated to unvested restricted shareholders, Diluted	$ (98)		$ (94)		$ (246)	$ (240)
Denominator
Weighted average units outstanding, basic (in shares)	171,527,031		170,848,894		171,411,631	170,737,437
Contingent securities/Share based compensation (in shares)	733,398		0		1,163,777	1,258,682
Weighted average units outstanding, diluted (in shares)	172,260,429		170,848,894		172,575,408	171,996,119
Earnings per Common Partnership Unit:
Net income attributable to common shareholders, Basic (in dollars per share)	$ 0.03		$ 0		$ 0.06	$ 0.04
Net income attributable to common shareholders, Diluted (in dollars per share)	$ 0.03		$ 0		$ 0.06	$ 0.04
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Numerator
Net income (loss)	$ 4,651	$ 6,101	$ (175)	$ 6,964	$ 10,752	$ 6,789
Net loss attributable to noncontrolling interests	2		1		4	2
Nonforfeitable dividends allocated to unvested restricted shareholders, Basic	(98)		(94)		(246)	(240)
Nonforfeitable dividends allocated to unvested restricted shareholders, Diluted	(98)		(94)		(246)	(240)
Net income (loss) attributable to common unitholders, Basic	4,555		(268)		10,510	6,551
Net income (loss) attributable to common unitholders, Diluted	$ 4,555		$ (268)		$ 10,510	$ 6,551
Denominator
Weighted average units outstanding, basic (in shares)	172,043,498		171,792,415		171,985,863	171,699,909
Contingent securities/Share based compensation (in shares)	733,398		0		1,163,777	1,258,682
Weighted average units outstanding, diluted (in shares)	172,776,896		171,792,415		173,149,640	172,958,591
Earnings per Common Partnership Unit:
Net income attributable to common shareholders, Basic (in dollars per share)	$ 0.03		$ 0		$ 0.06	$ 0.04
Net income attributable to common shareholders, Diluted (in dollars per share)	$ 0.03		$ 0		$ 0.06	$ 0.04

PARTNERS' EQUITY OF THE PAREN_4

PARTNERS' EQUITY OF THE PARENT COMPANY - Narrative (Details) $ / shares in Units, $ in Millions				3 Months Ended
	Jul. 20, 2022 $ / shares	May 18, 2022 USD ($) $ / shares	Feb. 23, 2022	Jun. 30, 2022 $ / shares	Mar. 31, 2022 $ / shares	Jun. 30, 2021 $ / shares	Mar. 31, 2021 $ / shares
Earnings Per Common Partnership Unit [Line Items]
Distributions declared (in dollars per share)		$ 0.19		$ 0.19	$ 0.19	$ 0.19	$ 0.19
Dividends, common stock \| $		$ 32.8
Subsequent Event
Earnings Per Common Partnership Unit [Line Items]
Dividends paid in cash (in dollars per share)	$ 0.19
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Earnings Per Common Partnership Unit [Line Items]
Dividends, common stock \| $		$ 32.8
Repurchase program, ratio of mirror unit of operating partnership retired for each common share repurchased			1
BRANDYWINE OPERATING PARTNERSHIP, L.P. \| Dividend declared
Earnings Per Common Partnership Unit [Line Items]
Distributions declared (in dollars per share)		$ 0.19

SEGMENT INFORMATION - Narrative

SEGMENT INFORMATION - Narrative (Details)	6 Months Ended
SEGMENT INFORMATION - Narrative (Details)	Jun. 30, 2022 segment
Segment Reporting [Abstract]
Number of reportable segments	5

SEGMENT INFORMATION - Real Esta

SEGMENT INFORMATION - Real Estate Investments, at Cost of Company's Reportable Segments (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Operating properties	$ 3,545,102	$ 3,472,602
Right of use asset - operating leases, net	19,988	20,313
Construction-in-progress	366,823	277,237
Land held for development	93,887	114,604
Prepaid leasehold interests in land held for development, net	35,576	27,762
Philadelphia CBD
Segment Reporting Information [Line Items]
Operating properties	1,506,350	1,460,510
Pennsylvania Suburbs
Segment Reporting Information [Line Items]
Operating properties	870,510	866,223
Austin, Texas
Segment Reporting Information [Line Items]
Operating properties	794,734	778,145
Metropolitan Washington, D.C.
Segment Reporting Information [Line Items]
Operating properties	287,215	280,921
Other
Segment Reporting Information [Line Items]
Operating properties	$ 86,293	$ 86,803

SEGMENT INFORMATION - Net Opera

SEGMENT INFORMATION - Net Operating Income of Company's Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting Information [Line Items]
Total revenue	$ 124,042	$ 120,102	$ 251,547	$ 240,871
Operating expenses	(49,649)	(47,427)	(97,567)	(94,101)
Net operating income	74,393	72,675	153,980	146,770
Operating Segments \| Philadelphia CBD
Segment Reporting Information [Line Items]
Total revenue	55,426	51,445	108,897	102,672
Operating expenses	(20,538)	(18,259)	(40,281)	(35,670)
Net operating income	34,888	33,186	68,616	67,002
Operating Segments \| Pennsylvania Suburbs
Segment Reporting Information [Line Items]
Total revenue	31,333	30,294	63,140	62,034
Operating expenses	(10,258)	(9,777)	(20,416)	(20,471)
Net operating income	21,075	20,517	42,724	41,563
Operating Segments \| Austin, Texas
Segment Reporting Information [Line Items]
Total revenue	23,921	25,513	48,836	51,688
Operating expenses	(10,438)	(9,962)	(20,731)	(19,682)
Net operating income	13,483	15,551	28,105	32,006
Operating Segments \| Metropolitan Washington, D.C.
Segment Reporting Information [Line Items]
Total revenue	5,486	4,812	10,681	9,487
Operating expenses	(3,116)	(3,902)	(6,544)	(8,101)
Net operating income	2,370	910	4,137	1,386
Operating Segments \| Other
Segment Reporting Information [Line Items]
Total revenue	3,919	3,662	7,523	6,875
Operating expenses	(2,342)	(2,528)	(4,352)	(4,810)
Net operating income	1,577	1,134	3,171	2,065
Corporate
Segment Reporting Information [Line Items]
Total revenue	3,957	4,376	12,470	8,115
Operating expenses	(2,957)	(2,999)	(5,243)	(5,367)
Net operating income	$ 1,000	$ 1,377	$ 7,227	$ 2,748

SEGMENT INFORMATION - Unconsoli

SEGMENT INFORMATION - Unconsolidated Real Estate Ventures of Company's Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Segment Reporting Information [Line Items]
Investment in real estate ventures	$ 429,246		$ 429,246		$ 411,110
Equity in income (loss) of real estate venture	(4,981)	$ (7,240)	(9,544)	$ (14,164)
Philadelphia CBD
Segment Reporting Information [Line Items]
Investment in real estate ventures	341,748		341,748		317,959
Equity in income (loss) of real estate venture	(2,574)	(4,661)
Metropolitan Washington, D.C.
Segment Reporting Information [Line Items]
Investment in real estate ventures	85,614		85,614		85,867
Equity in income (loss) of real estate venture	(381)	(778)
Mid-Atlantic Office JV
Segment Reporting Information [Line Items]
Investment in real estate ventures	31,478		31,478		31,680
Equity in income (loss) of real estate venture	(101)	117
MAP Venture
Segment Reporting Information [Line Items]
Investment in real estate ventures	(29,594)		$ (29,594)		$ (24,396)
Equity in income (loss) of real estate venture	$ (1,925)	$ (1,918)

SEGMENT INFORMATION - Reconcili

SEGMENT INFORMATION - Reconciliation of Consolidated Net Income to Consolidated NOI (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting [Abstract]
Net income (loss)	$ 4,651	$ 6,101	$ (175)	$ 6,964	$ 10,752	$ 6,789
Plus:
Interest expense	16,341		15,490		32,083	31,783
Interest expense - amortization of deferred financing costs	805		709		1,514	1,418
Depreciation and amortization	43,959		42,785		87,741	83,128
General and administrative expenses	8,328		8,356		18,328	14,940
Equity in loss of unconsolidated real estate ventures	4,981		7,240		9,544	14,164
Less:
Interest and investment income	449		1,677		889	3,351
Income tax provision	(48)		(15)		(75)	(34)
Net gain on disposition of real estate	144		68		144	142
Net gain on sale of undepreciated real estate	4,127		0		5,024	1,993
Consolidated net operating income	$ 74,393		$ 72,675		$ 153,980	$ 146,770

COMMITMENTS AND CONTINGENCIES (

COMMITMENTS AND CONTINGENCIES (Details) $ in Millions	1 Months Ended	6 Months Ended	12 Months Ended
COMMITMENTS AND CONTINGENCIES (Details) $ in Millions	Feb. 28, 2021 property	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Jul. 29, 2022 loan	Jul. 28, 2022 loan	Jul. 23, 2021 USD ($)
Loss Contingencies [Line Items]
Limited payment guarantee, percent of principle balance (up to)						25%
One and Two Commerce Square \| Preferred Equity Investment
Loss Contingencies [Line Items]
Other commitments		$ 20
Amount committed to date		5.9
Drexel Square
Loss Contingencies [Line Items]
Other commitments		7.2
Estimated potential additional contribution obligation		2.3
Winter Storm
Loss Contingencies [Line Items]
Number of properties damaged \| property	1
Write-off of fixed assets			$ 1.2
Restoration liability		0.8	7.2
Business interruption costs			3.9
Insurance proceeds		2.4	15.3
Winter Storm \| Other Income
Loss Contingencies [Line Items]
Insurance proceeds			3
Winter Storm \| Accounts Payable and Accrued Liabilities
Loss Contingencies [Line Items]
Restoration liability			$ 1.9
3025 JFK Venture
Loss Contingencies [Line Items]
Construction loan amount						$ 186.7
Unconsolidated Real Estate Ventures
Loss Contingencies [Line Items]
Unconsolidated real estate venture debt at 100%, gross		$ 1,224.5
One Uptown Venture \| Construction Loans \| Subsequent Event
Loss Contingencies [Line Items]
Number of loans closed \| loan				2	2

SUBSEQUENT EVENTS (Details)

SUBSEQUENT EVENTS (Details) $ in Thousands	Jul. 14, 2022 USD ($) ft²	Jun. 30, 2022 USD ($) ft²	Dec. 31, 2021 USD ($)
Subsequent Event [Line Items]
Rentable area (in square feet) \| ft²		13,639,287
Investment in real estate ventures		$ 429,246	$ 411,110
Subsequent Event \| 3151 Market Street
Subsequent Event [Line Items]
Rentable area (in square feet) \| ft²	417,000
Investment in real estate ventures	$ 307,000
Subsequent Event \| 3151 Market Street \| Joint Venture With Unaffiliated Third Party
Subsequent Event [Line Items]
Investment in real estate ventures	$ 55,000
Subsequent Event \| 3151 Market Street \| Joint Venture With Unaffiliated Third Party \| Joint Venture With Unaffiliated Third Party
Subsequent Event [Line Items]
Equity method investment, ownership percentage	45%