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REAL ESTATE INVESTMENTS - Narrative (Details) |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2023 USD ($) | Sep. 30, 2023 USD ($) ft² | Mar. 31, 2023 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) ft² | Sep. 30, 2022 USD ($) | Jan. 30, 2023 ft²
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Net gain on disposition of real estate |  | $ 0 |  | $ 8,669,000 | $ 0 | $ 8,813,000 |
Leaseholds and Leasehold Improvements | 3151 Market Street |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Operating lease costs, capitalized |  |  | $ 7,800,000 |  |  |  |
Rentable area (in square feet) | ft² |  |  |  |  |  |  | 200,000
Net gain from remeasurment of investment in real estate ventures |  |  | $ 800,000 |  |  |  |
Office Properties | Pennsylvania suburbs segment |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Impairment charge |  | $ 11,700,000 |  |  |  |  |
Office Properties | Three Barton Skyway |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Rentable area (in square feet) | ft² |  | 173,302 |  |  | 173,302 |  |
Disposal group, including discontinued operation, consideration |  | $ 53,300,000 |  |  | $ 53,300,000 |  |
Impairment charge | $ 4,500,000 |  |  |  |  |  |
Net gain on disposition of real estate |  | $ 0 |  |  |  |  |

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