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SEGMENT INFORMATION - Unconsolidated Real Estate Ventures of Company's Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022
Segment Reporting Information [Line Items] |  |  |
Investment in real estate ventures | $ 545,491 |  | $ 532,224
Equity in income (loss) of real estate venture | (6,167) | $ (4,563) |
Philadelphia CBD |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in real estate ventures | 404,838 |  | 387,301
Equity in income (loss) of real estate venture | (3,259) | (2,772) |
Metropolitan Washington, D.C. |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in real estate ventures | 82,281 |  | 83,903
Equity in income (loss) of real estate venture | (1,176) | (186) |
Mid-Atlantic Office JV |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in real estate ventures | 30,591 |  | 31,005
Equity in income (loss) of real estate venture | 190 | 418 |
MAP Venture |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in real estate ventures | (38,284) |  | (35,411)
Equity in income (loss) of real estate venture | (1,922) | (2,023) |
Austin, Texas |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in real estate ventures | 66,065 |  | $ 65,426
Equity in income (loss) of real estate venture | $ 0 | $ 0 |

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