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SEGMENT INFORMATION - Schedule of Unconsolidated Real Estate Ventures of Company's Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025 | Dec. 31, 2025
Segment Reporting [Line Items] |  |  |  |  |
Investment in real estate ventures | $ 336,851 |  | $ 336,851 |  | $ 314,326
Equity in income (loss) of real estate ventures | (8,738) | $ (14,832) | (17,440) | $ (25,343) |
Philadelphia CBD |  |  |  |  |
Segment Reporting [Line Items] |  |  |  |  |
Investment in real estate ventures | 215,205 |  | 215,205 |  | 215,078
Equity in income (loss) of real estate ventures | (1,991) | (7,651) | (4,299) | (11,859) |
Mid-Atlantic Office JV |  |  |  |  |
Segment Reporting [Line Items] |  |  |  |  |
Investment in real estate ventures | 10,359 |  | 10,359 |  | 10,877
Equity in income (loss) of real estate ventures | (345) | 436 | (442) | 275 |
Austin, Texas |  |  |  |  |
Segment Reporting [Line Items] |  |  |  |  |
Investment in real estate ventures | 94,519 |  | 94,519 |  | 71,611
Equity in income (loss) of real estate ventures | (6,198) | (7,510) | (12,328) | (13,398) |
Other |  |  |  |  |
Segment Reporting [Line Items] |  |  |  |  |
Investment in real estate ventures | 16,768 |  | 16,768 |  | $ 16,760
Equity in income (loss) of real estate ventures | $ (204) | $ (107) | $ (371) | $ (361) |

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