CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2025	Sep. 30, 2024
Statement of Comprehensive Income [Abstract]
Net loss	$ (25,998)	$ (88,936)	$ (27,056)	$ (165,720)	$ 30,267	$ (16,414)	$ (141,990)	$ (151,867)
Comprehensive loss:
Unrealized loss on derivative financial instruments	(439)			(9,919)			(4,090)	(3,112)
Total comprehensive loss	(439)	$ (1,099)	$ (2,552)	(9,919)	$ 781	$ 6,026	(4,090)	(3,112)
Comprehensive loss	(26,437)			(175,639)			(146,080)	(154,979)
Comprehensive loss attributable to noncontrolling interest	80			529			440	459
Comprehensive loss attributable to Brandywine Realty Trust	$ (26,357)			$ (175,110)			$ (145,640)	$ (154,520)