CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 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)	$ (12,737)	$ (5,276)	13,478	$ 4,651	$ 6,101	(39,649)	24,230
Net (income) loss attributable to noncontrolling interests	82			(37)			140	(59)
Net income (loss) attributable to Brandywine Realty Trust	(21,554)			13,441			(39,509)	24,171
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 shares outstanding (in shares)	172,097,661			171,569,807			171,912,552	171,464,936
Diluted weighted average shares outstanding (in shares)	172,097,661			172,152,256			171,912,552	172,435,153
Rents
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
Other
Revenue
Total revenue	$ 1,158			$ 1,216			$ 5,057	$ 8,933