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SEGMENT INFORMATION - Unconsolidated Real Estate Ventures of Company's Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | $ 592,948 |  | $ 592,948 |  | $ 532,224
Equity in income (loss) of real estate venture | (10,739) | $ (6,260) | (24,504) | $ (15,804) |
Philadelphia CBD |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | 453,917 |  | 453,917 |  | 387,301
Equity in income (loss) of real estate venture | (6,537) | (3,452) | (14,208) | (8,798) |
Metropolitan Washington, D.C. |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | 82,350 |  | 82,350 |  | 83,903
Equity in income (loss) of real estate venture | (1,306) | (706) | (3,896) | (1,273) |
Mid-Atlantic Office JV |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | 28,335 |  | 28,335 |  | 31,005
Equity in income (loss) of real estate venture | 182 | (83) | 595 | 234 |
MAP Venture |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | (45,148) |  | (45,148) |  | (35,411)
Equity in income (loss) of real estate venture | (3,078) | (2,019) | (6,995) | (5,967) |
Austin, Texas |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | 73,494 |  | 73,494 |  | $ 65,426
Equity in income (loss) of real estate venture | $ 0 | $ 0 | $ 0 | $ 0 |

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