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SEGMENT INFORMATION - Schedule of Unconsolidated Real Estate Ventures of Company's Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | $ 594,203 |  | $ 594,203 |  | $ 570,455
Equity in income (loss) of real estate ventures | (18,183) | $ (125,862) | (43,526) | $ (153,957) |
Philadelphia CBD |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | 492,224 |  | 492,224 |  | 452,334
Equity in income (loss) of real estate ventures | (10,325) | (125,593) | (22,184) | (145,429) |
Mid-Atlantic Office JV |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | 10,951 |  | 10,951 |  | 10,844
Equity in income (loss) of real estate ventures | (168) | 7,222 | 107 | 7,222 |
MAP Venture |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | 0 |  | 0 |  | 0
Equity in income (loss) of real estate ventures | 0 | 10 | 0 | (6,552) |
Austin, Texas |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | 74,101 |  | 74,101 |  | 90,495
Equity in income (loss) of real estate ventures | (7,510) | (586) | (20,908) | (590) |
Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | 16,927 |  | 16,927 |  | $ 16,782
Equity in income (loss) of real estate ventures | $ (180) | $ (6,915) | $ (541) | $ (8,608) |

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