CONSOLIDATED STATEMENTS OF OPERATIONS - BRANDYWINE OPERATING PARTNERSHIP, L.P. - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenue
Total revenue	$ 131,782	$ 129,372	$ 383,612	$ 384,481
Operating expenses
Property operating expenses	31,900	31,123	95,532	96,608
Real estate taxes	11,892	12,808	37,019	38,981
Third party management expenses	2,487	2,468	7,456	7,664
Depreciation and amortization	44,301	48,966	133,530	141,645
General and administrative expenses	12,681	8,069	32,726	26,911
Provision for impairment	37,980	11,666	44,407	16,134
Total operating expenses	141,241	115,100	350,670	327,943
Gain on sale of real estate
Net gain on sale of undepreciated real estate	0	0	0	781
Total gain on sale of real estate	0	0	0	781
Operating income (loss)	(9,459)	14,272	32,942	57,319
Other income (expense):
Interest and investment income	639	293	2,572	1,318
Interest expense	(30,561)	(24,355)	(85,104)	(70,677)
Interest expense - amortization of deferred financing costs	(1,247)	(1,110)	(3,753)	(3,251)
Equity in loss of unconsolidated real estate ventures	(125,862)	(10,739)	(153,957)	(24,504)
Net gain on real estate venture transactions	770	0	54,503	181
Gain on early extinguishment of debt	0	0	941	0
Net loss before income taxes	(165,720)	(21,639)	(151,856)	(39,614)
Income tax benefit (provision)	0	3	(11)	(35)
Net loss	(165,720)	(21,636)	(151,867)	(39,649)
Nonforfeitable dividends allocated to unvested restricted unitholders	(276)	(159)	(889)	(433)
Net loss attributable to Common Shareholders of Brandywine Realty Trust	$ (165,496)	$ (21,713)	$ (152,304)	$ (39,942)
Basic loss per Common Partnership Unit (in dollars per share)	$ (0.96)	$ (0.13)	$ (0.88)	$ (0.23)
Diluted loss per Common Partnership Unit (in dollars per share)	$ (0.96)	$ (0.13)	$ (0.88)	$ (0.23)
Basic weighted average common partnership units outstanding (in shares)	172,668,731	172,097,661	172,480,325	171,912,552
Diluted weighted average common partnership units outstanding (in shares)	172,668,731	172,097,661	172,480,325	171,912,552
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Revenue
Total revenue	$ 131,782	$ 129,372	$ 383,612	$ 384,481
Operating expenses
Property operating expenses	31,900	31,123	95,532	96,608
Real estate taxes	11,892	12,808	37,019	38,981
Third party management expenses	2,487	2,468	7,456	7,664
Depreciation and amortization	44,301	48,966	133,530	141,645
General and administrative expenses	12,681	8,069	32,726	26,911
Provision for impairment	37,980	11,666	44,407	16,134
Total operating expenses	141,241	115,100	350,670	327,943
Gain on sale of real estate
Net gain on sale of undepreciated real estate	0	0	0	781
Total gain on sale of real estate	0	0	0	781
Operating income (loss)	(9,459)	14,272	32,942	57,319
Other income (expense):
Interest and investment income	639	293	2,572	1,318
Interest expense	(30,561)	(24,355)	(85,104)	(70,677)
Interest expense - amortization of deferred financing costs	(1,247)	(1,110)	(3,753)	(3,251)
Equity in loss of unconsolidated real estate ventures	(125,862)	(10,739)	(153,957)	(24,504)
Net gain on real estate venture transactions	770	0	54,503	181
Gain on early extinguishment of debt	0	0	941	0
Net loss before income taxes	(165,720)	(21,639)	(151,856)	(39,614)
Income tax benefit (provision)	0	3	(11)	(35)
Net loss	(165,720)	(21,636)	(151,867)	(39,649)
Net (income) loss attributable to noncontrolling interests - consolidated real estate ventures	3	20	(3)	21
Net loss attributable to Brandywine Operating Partnership, L.P.	(165,717)	(21,616)	(151,870)	(39,628)
Nonforfeitable dividends allocated to unvested restricted unitholders	(276)	(159)	(889)	(433)
Net loss attributable to Common Shareholders of Brandywine Realty Trust	$ (165,993)	$ (21,775)	$ (152,759)	$ (40,061)
Basic loss per Common Partnership Unit (in dollars per share)	$ (0.96)	$ (0.13)	$ (0.88)	$ (0.23)
Diluted loss per Common Partnership Unit (in dollars per share)	$ (0.96)	$ (0.13)	$ (0.88)	$ (0.23)
Basic weighted average common partnership units outstanding (in shares)	173,184,325	172,614,128	172,995,920	172,429,019
Diluted weighted average common partnership units outstanding (in shares)	173,184,325	172,614,128	172,995,920	172,429,019
Rents
Revenue
Total revenue	$ 117,958	$ 121,661	$ 354,975	$ 360,642
Rents | BRANDYWINE OPERATING PARTNERSHIP, L.P.
Revenue
Total revenue	117,958	121,661	354,975	360,642
Third party management fees, labor reimbursement and leasing
Revenue
Total revenue	6,093	6,553	17,685	18,782
Third party management fees, labor reimbursement and leasing | BRANDYWINE OPERATING PARTNERSHIP, L.P.
Revenue
Total revenue	6,093	6,553	17,685	18,782
Other
Revenue
Total revenue	7,731	1,158	10,952	5,057
Other | BRANDYWINE OPERATING PARTNERSHIP, L.P.
Revenue
Total revenue	$ 7,731	$ 1,158	$ 10,952	$ 5,057