PARTNERS' EQUITY OF THE PARENT COMPANY - Narrative (Details) $ / shares in Units, $ in Millions		3 Months Ended	12 Months Ended
	Jan. 23, 2025 USD ($)	Dec. 31, 2024 $ / shares shares	Dec. 31, 2024 class $ / shares shares	Dec. 31, 2023 $ / shares shares	Dec. 31, 2022 $ / shares shares
Earnings Per Common Partnership Unit [Line Items]
Number of classes of partnership units | class			2
Distributions declared (in dollars per share) | $ / shares		$ 0.15	$ 0.60	$ 0.68	$ 0.76
Repurchased and retired (in shares)			0	0
Subsequent Event
Earnings Per Common Partnership Unit [Line Items]
Amount of dividend declared | $	$ 26.3
Class A Units
Earnings Per Common Partnership Unit [Line Items]
Redeemable limited partnership unit price (in dollars per share) | $ / shares		$ 5.60	$ 5.60	$ 5.40	$ 6.15
Limited partners' capital account, units outstanding (in units)		515,595	515,595	515,595	516,467
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Earnings Per Common Partnership Unit [Line Items]
Preferred units, outstanding (in units)		0	0	0
Distributions declared (in dollars per share) | $ / shares		$ 0.15
Repurchase program, number of mirror unit of operating partnership retired for each common share repurchased			1
BRANDYWINE OPERATING PARTNERSHIP, L.P. | Subsequent Event
Earnings Per Common Partnership Unit [Line Items]
Amount of dividend declared | $	$ 26.3