CONSOLIDATED STATEMENTS OF OPERATIONS - BRANDYWINE OPERATING PARTNERSHIP, L.P. - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenue
Total revenue	$ 125,882	$ 124,042	$ 255,109	$ 251,547
Operating expenses
Property operating expenses	31,891	33,111	65,485	64,659
Real estate taxes	11,571	13,746	26,173	27,559
Third party management expenses	2,557	2,792	5,196	5,349
Depreciation and amortization	47,079	43,959	92,679	87,741
General and administrative expenses	9,360	8,328	18,842	18,328
Provision for impairment	4,468	0	4,468	0
Total operating expenses	106,926	101,936	212,843	203,636
Gain on sale of real estate
Net gain on disposition of real estate	0	144	0	144
Net gain on sale of undepreciated real estate	0	4,127	781	5,024
Total gain on sale of real estate	0	4,271	781	5,168
Operating income	18,956	26,377	43,047	53,079
Nonoperating Income (Expense) [Abstract]
Interest income	520	449	1,025	889
Interest expense	(23,669)	(16,341)	(46,322)	(32,083)
Interest expense - amortization of deferred financing costs	(1,114)	(805)	(2,141)	(1,514)
Equity in loss of unconsolidated real estate ventures	(7,598)	(4,981)	(13,765)	(9,544)
Net gain on real estate venture transactions	181	0	181	0
Net income (loss) before income taxes	(12,724)	4,699	(17,975)	10,827
Income tax provision	(13)	(48)	(38)	(75)
Net income (loss)	(12,737)	4,651	(18,013)	10,752
Nonforfeitable dividends allocated to unvested restricted shareholders	(204)	(98)	(274)	(246)
Net income (loss) attributable to Common Shareholders of Brandywine Realty Trust	$ (12,900)	$ 4,539	$ (18,229)	$ 10,484
Basic income (loss) per Common Partnership Unit (in dollars per share)	$ (0.08)	$ 0.03	$ (0.11)	$ 0.06
Diluted income (loss) per Common Partnership Unit (in dollars per share)	$ (0.08)	$ 0.03	$ (0.11)	$ 0.06
Basic weighted average common partnership units outstanding (in shares)	171,962,162	171,527,031	171,818,463	171,411,631
Diluted weighted average common partnership units outstanding (in shares)	171,962,162	172,260,429	171,818,463	172,575,408
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Revenue
Total revenue	$ 125,882	$ 124,042	$ 255,109	$ 251,547
Operating expenses
Property operating expenses	31,891	33,111	65,485	64,659
Real estate taxes	11,571	13,746	26,173	27,559
Third party management expenses	2,557	2,792	5,196	5,349
Depreciation and amortization	47,079	43,959	92,679	87,741
General and administrative expenses	9,360	8,328	18,842	18,328
Provision for impairment	4,468	0	4,468	0
Total operating expenses	106,926	101,936	212,843	203,636
Gain on sale of real estate
Net gain on disposition of real estate	0	144	0	144
Net gain on sale of undepreciated real estate	0	4,127	781	5,024
Total gain on sale of real estate	0	4,271	781	5,168
Operating income	18,956	26,377	43,047	53,079
Nonoperating Income (Expense) [Abstract]
Interest income	520	449	1,025	889
Interest expense	(23,669)	(16,341)	(46,322)	(32,083)
Interest expense - amortization of deferred financing costs	(1,114)	(805)	(2,141)	(1,514)
Equity in loss of unconsolidated real estate ventures	(7,598)	(4,981)	(13,765)	(9,544)
Net gain on real estate venture transactions	181	0	181	0
Net income (loss) before income taxes	(12,724)	4,699	(17,975)	10,827
Income tax provision	(13)	(48)	(38)	(75)
Net income (loss)	(12,737)	4,651	(18,013)	10,752
Net loss attributable to noncontrolling interests - consolidated real estate ventures	0	2	1	4
Net income (loss) attributable to Brandywine Operating Partnership	(12,737)	4,653	(18,012)	10,756
Nonforfeitable dividends allocated to unvested restricted shareholders	(204)	(98)	(274)	(246)
Net income (loss) attributable to Common Shareholders of Brandywine Realty Trust	$ (12,941)	$ 4,555	$ (18,286)	$ 10,510
Basic income (loss) per Common Partnership Unit (in dollars per share)	$ (0.08)	$ 0.03	$ (0.11)	$ 0.06
Diluted income (loss) per Common Partnership Unit (in dollars per share)	$ (0.08)	$ 0.03	$ (0.11)	$ 0.06
Basic weighted average common partnership units outstanding (in shares)	172,478,629	172,043,498	172,334,930	171,985,863
Diluted weighted average common partnership units outstanding (in shares)	172,478,629	172,776,896	172,334,930	173,149,640
Rents
Revenue
Total revenue	$ 118,133	$ 116,897	$ 238,981	$ 232,798
Rents | BRANDYWINE OPERATING PARTNERSHIP, L.P.
Revenue
Total revenue	118,133	116,897	238,981	232,798
Third party management fees, labor reimbursement and leasing
Revenue
Total revenue	6,227	5,924	12,229	11,032
Third party management fees, labor reimbursement and leasing | BRANDYWINE OPERATING PARTNERSHIP, L.P.
Revenue
Total revenue	6,227	5,924	12,229	11,032
Other
Revenue
Total revenue	1,522	1,221	3,899	7,717
Other | BRANDYWINE OPERATING PARTNERSHIP, L.P.
Revenue
Total revenue	$ 1,522	$ 1,221	$ 3,899	$ 7,717