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SEGMENT INFORMATION - Unconsolidated Real Estate Ventures of Company's Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Segment Reporting Information [Line Items] |  |  |
Investment in real estate ventures | $ 565,842 |  | $ 552,494
Equity in income (loss) of real estate ventures | (13,588) | $ (6,167) |
Philadelphia CBD |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in real estate ventures | 468,642 |  | 450,136
Equity in income (loss) of real estate ventures | (9,613) | (3,259) |
Metropolitan Washington, D.C. |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in real estate ventures | 69,288 |  | 71,931
Equity in income (loss) of real estate ventures | (752) | (1,176) |
Mid-Atlantic Office JV |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in real estate ventures | 0 |  | 0
Equity in income (loss) of real estate ventures | 0 | 190 |
MAP Venture |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in real estate ventures | (52,200) |  | (48,733)
Equity in income (loss) of real estate ventures | (3,223) | (1,922) |
Austin, Texas |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in real estate ventures | 80,112 |  | $ 79,160
Equity in income (loss) of real estate ventures | $ 0 | $ 0 |

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