CONSOLIDATED STATEMENTS OF OPERATIONS - BRANDYWINE OPERATING PARTNERSHIP, L.P. - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenue
Total revenue	$ 129,372	$ 125,569	$ 384,481	$ 377,116
Operating expenses
Property operating expenses	31,123	32,624	96,608	97,283
Real estate taxes	12,808	12,313	38,981	39,872
Third party management expenses	2,468	2,549	7,664	7,898
Depreciation and amortization	48,966	45,134	141,645	132,875
General and administrative expenses	8,069	7,564	26,911	25,892
Provision for impairment	11,666	0	16,134	0
Total operating expenses	115,100	100,184	327,943	303,820
Gain on sale of real estate
Net gain on disposition of real estate	0	8,669	0	8,813
Net gain on sale of undepreciated real estate	0	2,983	781	8,007
Total gain on sale of real estate	0	11,652	781	16,820
Operating income	14,272	37,037	57,319	90,116
Other income (expense):
Interest income	293	498	1,318	1,387
Interest expense	(24,355)	(17,061)	(70,677)	(49,144)
Interest expense - amortization of deferred financing costs	(1,110)	(745)	(3,251)	(2,259)
Equity in loss of unconsolidated real estate ventures	(10,739)	(6,260)	(24,504)	(15,804)
Net gain on real estate venture transactions	0	0	181	0
Net income (loss) before income taxes	(21,639)	13,469	(39,614)	24,296
Income tax benefit (provision)	3	9	(35)	(66)
Net income (loss)	(21,636)	13,478	(39,649)	24,230
Nonforfeitable dividends allocated to unvested restricted shareholders	(159)	(105)	(433)	(351)
Net income (loss) attributable to Common Shareholders of Brandywine Realty Trust	$ (21,713)	$ 13,336	$ (39,942)	$ 23,820
Basic income (loss) per Common Share (in dollars per share)	$ (0.13)	$ 0.08	$ (0.23)	$ 0.14
Diluted income (loss) per Common Share (in dollars per share)	$ (0.13)	$ 0.08	$ (0.23)	$ 0.14
Basic weighted average common partnership units outstanding (in shares)	172,097,661	171,569,807	171,912,552	171,464,936
Diluted weighted average common partnership units outstanding (in shares)	172,097,661	172,152,256	171,912,552	172,435,153
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Revenue
Total revenue	$ 129,372	$ 125,569	$ 384,481	$ 377,116
Operating expenses
Property operating expenses	31,123	32,624	96,608	97,283
Real estate taxes	12,808	12,313	38,981	39,872
Third party management expenses	2,468	2,549	7,664	7,898
Depreciation and amortization	48,966	45,134	141,645	132,875
General and administrative expenses	8,069	7,564	26,911	25,892
Provision for impairment	11,666	0	16,134	0
Total operating expenses	115,100	100,184	327,943	303,820
Gain on sale of real estate
Net gain on disposition of real estate	0	8,669	0	8,813
Net gain on sale of undepreciated real estate	0	2,983	781	8,007
Total gain on sale of real estate	0	11,652	781	16,820
Operating income	14,272	37,037	57,319	90,116
Other income (expense):
Interest income	293	498	1,318	1,387
Interest expense	(24,355)	(17,061)	(70,677)	(49,144)
Interest expense - amortization of deferred financing costs	(1,110)	(745)	(3,251)	(2,259)
Equity in loss of unconsolidated real estate ventures	(10,739)	(6,260)	(24,504)	(15,804)
Net gain on real estate venture transactions	0	0	181	0
Net income (loss) before income taxes	(21,639)	13,469	(39,614)	24,296
Income tax benefit (provision)	3	9	(35)	(66)
Net income (loss)	(21,636)	13,478	(39,649)	24,230
Net loss attributable to noncontrolling interests - consolidated real estate ventures	20	1	21	5
Net income (loss) attributable to Brandywine Operating Partnership	(21,616)	13,479	(39,628)	24,235
Nonforfeitable dividends allocated to unvested restricted shareholders	(159)	(105)	(433)	(351)
Net income (loss) attributable to Common Shareholders of Brandywine Realty Trust	$ (21,775)	$ 13,374	$ (40,061)	$ 23,884
Basic income (loss) per Common Share (in dollars per share)	$ (0.13)	$ 0.08	$ (0.23)	$ 0.14
Diluted income (loss) per Common Share (in dollars per share)	$ (0.13)	$ 0.08	$ (0.23)	$ 0.14
Basic weighted average common partnership units outstanding (in shares)	172,614,128	172,086,274	172,429,019	172,019,701
Diluted weighted average common partnership units outstanding (in shares)	172,614,128	172,668,723	172,429,019	172,989,918
Rents
Revenue
Total revenue	$ 121,661	$ 117,481	$ 360,642	$ 350,279
Rents | BRANDYWINE OPERATING PARTNERSHIP, L.P.
Revenue
Total revenue	121,661	117,481	360,642	350,279
Third party management fees, labor reimbursement and leasing
Revenue
Total revenue	6,553	6,872	18,782	17,904
Third party management fees, labor reimbursement and leasing | BRANDYWINE OPERATING PARTNERSHIP, L.P.
Revenue
Total revenue	6,553	6,872	18,782	17,904
Other
Revenue
Total revenue	1,158	1,216	5,057	8,933
Other | BRANDYWINE OPERATING PARTNERSHIP, L.P.
Revenue
Total revenue	$ 1,158	$ 1,216	$ 5,057	$ 8,933