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SEGMENT INFORMATION - Unconsolidated Real Estate Ventures of Company's Reportable Segments (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Segment Reporting Information [Line Items] |  |  |
Investment in real estate ventures, at equity | $ 570,455 | $ 552,494 |
Equity in income (loss) of real estate venture | (191,585) | (77,915) | $ (22,016)
Philadelphia CBD |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in real estate ventures, at equity | 452,334 | 450,136 |
Equity in income (loss) of real estate venture | (155,567) | (25,793) | (11,764)
Mid-Atlantic Office JV |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in real estate ventures, at equity | 10,844 | 0 |
Equity in income (loss) of real estate venture | 7,141 | (26,448) | 412
MAP Venture |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in real estate ventures, at equity | 0 | (48,733) |
Equity in income (loss) of real estate venture | (6,542) | (10,581) | (8,340)
Austin, Texas |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in real estate ventures, at equity | 90,495 | 79,160 |
Equity in income (loss) of real estate venture | (4,001) | 0 | 0
Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in real estate ventures, at equity | 16,782 | 71,931 |
Equity in income (loss) of real estate venture | $ (32,616) | $ (15,093) | $ (2,324)

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