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PARTNERS' EQUITY OF THE PARENT COMPANY - Schedule of Number of Units and Net Income Used to Calculate Basic and Diluted Earnings Per Common Partnership Unit (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Mar. 31, 2026 | Jun. 30, 2025 | Mar. 31, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Numerator |  |  |  |  |  |
Net loss | $ (31,535) | $ (48,804) | $ (88,936) | $ (27,056) | $ (80,339) | $ (115,992)
Nonforfeitable dividends allocated to unvested restricted shareholders | (248) |  | (322) |  | (566) | (751)
Nonforfeitable dividends allocated to unvested restricted unitholders, diluted | (248) |  | (322) |  | (566) | (751)
Net loss attributable to Common Shareholders of Brandywine Realty Trust | (31,658) |  | (88,991) |  | (80,567) | (116,395)
Net loss attributable to common unitholders, diluted | $ (31,658) |  | $ (88,991) |  | $ (80,567) | $ (116,395)
Denominator |  |  |  |  |  |
Total weighted-average units outstanding, basic (in shares) | 174,384,600 |  | 173,532,583 |  | 174,072,403 | 173,225,737
Total weighted-average units outstanding, diluted (in shares) | 174,384,600 |  | 173,532,583 |  | 174,072,403 | 173,225,737
Loss per Common Partnership Unit: |  |  |  |  |  |
Net loss attributable to common shareholders, basic (in dollars per share) | $ (0.18) |  | $ (0.51) |  | $ (0.46) | $ (0.67)
Net loss attributable to common shareholders, diluted (in dollars per share) | $ (0.18) |  | $ (0.51) |  | $ (0.46) | $ (0.67)
Brandywine Operating Partnership, L.P. |  |  |  |  |  |
Numerator |  |  |  |  |  |
Net loss | $ (31,535) | $ (48,804) | $ (88,936) | $ (27,056) | $ (80,339) | $ (115,992)
Net loss attributable to noncontrolling interests | 30 |  | 0 |  | 97 | 0
Nonforfeitable dividends allocated to unvested restricted shareholders | (248) |  | (322) |  | (566) | (751)
Nonforfeitable dividends allocated to unvested restricted unitholders, diluted | (248) |  | (322) |  | (566) | (751)
Net loss attributable to Common Shareholders of Brandywine Realty Trust | (31,753) |  | (89,258) |  | (80,808) | (116,743)
Net loss attributable to common unitholders, diluted | $ (31,753) |  | $ (89,258) |  | $ (80,808) | $ (116,743)
Denominator |  |  |  |  |  |
Total weighted-average units outstanding, basic (in shares) | 174,900,195 |  | 174,048,178 |  | 174,587,997 | 173,741,332
Total weighted-average units outstanding, diluted (in shares) | 174,900,195 |  | 174,048,178 |  | 174,587,997 | 173,741,332
Loss per Common Partnership Unit: |  |  |  |  |  |
Net loss attributable to common shareholders, basic (in dollars per share) | $ (0.18) |  | $ (0.51) |  | $ (0.46) | $ (0.67)
Net loss attributable to common shareholders, diluted (in dollars per share) | $ (0.18) |  | $ (0.51) |  | $ (0.46) | $ (0.67)

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