CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - 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
Statement of Comprehensive Income [Abstract]
Net income (loss)		$ (21,636)	$ (12,737)	$ (5,276)	$ 13,478	$ 4,651	$ 6,101	$ (39,649)	$ 24,230
Comprehensive income:
Unrealized gain on derivative financial instruments		2,885			490			4,240	6,001
Amortization of interest rate contracts	[1]	0			188			0	564
Total comprehensive income		2,885	$ 6,646	$ (5,291)	678	$ 1,935	$ 3,952	4,240	6,565
Comprehensive income (loss)		(18,751)			14,156			(35,409)	30,795
Comprehensive (income) loss attributable to noncontrolling interest		106			(39)			128	(79)
Comprehensive income (loss) attributable to Brandywine Realty Trust		$ (18,645)			$ 14,117			$ (35,281)	$ 30,716

[1] Amounts reclassified from comprehensive income to interest expense within the Consolidated Statements of Operations.