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INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES - Mid-Atlantic Office JV (Details) | Dec. 21, 2020 USD ($) ft² property | Mar. 31, 2024 USD ($) property | Dec. 31, 2023 USD ($)
--- | --- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |  |
Number of real estate properties | property |  | 72 |
Investment in real estate ventures |  | $ 565,842,000 | $ 552,494,000
Philadelphia CBD |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investment in real estate ventures |  | 468,642,000 | 450,136,000
Other |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investment in real estate ventures |  | $ 69,288,000 | $ 71,931,000
Mid-Atlantic Office Venture |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership percentage | 40.00% |  |
Joint venture, funding from debt | $ 147,400,000 |  |
Proceeds from issuance of secured debt | $ 120,800,000 |  |
Mid-Atlantic Office Venture | Mid-Atlantic Office JV Loan | Secured Overnight Financing Rate (SOFR) |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Basis spread on interest rate (as percent) | 3.25% |  |
Office Properties | Mid-Atlantic Office Venture |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Number of real estate properties | property | 12 |  |
Rentable area (in square feet) | ft² | 1,128,645 |  |
Disposal group, including discontinued operation, consideration | $ 192,900,000 |  |
Investment in real estate ventures | $ 0 |  |
Office Properties | Mid-Atlantic Office Venture | Philadelphia CBD |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Number of real estate properties | property | 9 |  |
Office Properties | Mid-Atlantic Office Venture | Other |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Number of real estate properties | property | 3 |  |

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