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BENEFICIARIES' EQUITY OF THE PARENT COMPANY - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($)
$ / shares in Units, $ 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
Numerator                
Net loss $ (25,998) $ (88,936) $ (27,056) $ (165,720) $ 30,267 $ (16,414) $ (141,990) $ (151,867)
Basic                
Net loss attributable to noncontrolling interests 79     500     427 452
Nonforfeitable dividends allocated to unvested restricted shareholders (313)     (276)     (1,064) (889)
Net loss attributable to Common Shareholders of Brandywine Realty Trust (26,232)     (165,496)     (142,627) (152,304)
Diluted                
Net loss attributable to noncontrolling interests 79     500     427 452
Nonforfeitable dividends allocated to unvested restricted shareholders (313)     (276)     (1,064) (889)
Net loss attributable to common shareholders $ (26,232)     $ (165,496)     $ (142,627) $ (152,304)
Denominator                
Weighted average shares outstanding, basic (in shares) 173,699,312     172,668,731     173,385,330 172,480,325
Weighted average shares outstanding, diluted (in shares) 173,699,312     172,668,731     173,385,330 172,480,325
Loss per Common Share:                
Net loss attributable to common shareholders, basic (in dollars per share) $ (0.15)     $ (0.96)     $ (0.82) $ (0.88)
Net loss attributable to common shareholders, diluted (in dollars per share) $ (0.15)     $ (0.96)     $ (0.82) $ (0.88)