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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, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | $ 602,700 |  | $ 602,700 |  | $ 552,494
Equity in income (loss) of real estate ventures | (125,862) | $ (10,739) | (153,957) | $ (24,504) |
Philadelphia CBD |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | 419,700 |  | 419,700 |  | 450,136
Equity in income (loss) of real estate ventures | (125,593) | (6,537) | (145,429) | (14,208) |
Metropolitan Washington, D.C. |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | 86,666 |  | 86,666 |  | 71,931
Equity in income (loss) of real estate ventures | (6,915) | (1,306) | (8,608) | (3,896) |
Mid-Atlantic Office JV |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | 10,925 |  | 10,925 |  | 0
Equity in income (loss) of real estate ventures | 7,222 | 182 | 7,222 | 595 |
MAP Venture |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | 0 |  | 0 |  | (48,733)
Equity in income (loss) of real estate ventures | 10 | (3,078) | (6,552) | (6,995) |
Austin, Texas |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | 85,409 |  | 85,409 |  | $ 79,160
Equity in income (loss) of real estate ventures | $ (586) | $ 0 | $ (590) | $ 0 |

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