CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 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)	$ 30,267	$ (16,414)	(21,636)	$ (12,737)	$ (5,276)	(151,867)	(39,649)
Net loss attributable to noncontrolling interests	500			82			452	140
Net loss attributable to Brandywine Realty Trust	(165,220)			(21,554)			(151,415)	(39,509)
Nonforfeitable dividends allocated to unvested restricted shareholders	(276)			(159)			(889)	(433)
Net loss attributable to common shareholders, basic	$ (165,496)			$ (21,713)			$ (152,304)	$ (39,942)
Basic loss per Common Share (in dollars per share)	$ (0.96)			$ (0.13)			$ (0.88)	$ (0.23)
Diluted loss per Common Share (in dollars per share)	$ (0.96)			$ (0.13)			$ (0.88)	$ (0.23)
Basic weighted average shares outstanding (in shares)	172,668,731			172,097,661			172,480,325	171,912,552
Diluted weighted average shares outstanding (in shares)	172,668,731			172,097,661			172,480,325	171,912,552
Rents
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
Other
Revenue
Total revenue	$ 7,731			$ 1,158			$ 10,952	$ 5,057