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INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES - Mid-Atlantic Office JV (Details) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Dec. 21, 2020 USD ($) ft² property | Dec. 31, 2022 USD ($) property | Dec. 31, 2021 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |
Number of real estate properties | property |  | 77 |
Investment in real estate ventures, at equity |  | $ 532,224 | $ 411,110
Mid-Atlantic Office JV Loan |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Secured construction loan with total borrowing capacity |  | 18,500 |
Philadelphia CBD |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investment in real estate ventures, at equity |  | 387,301 | 317,959
Metropolitan Washington, D.C. |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investment in real estate ventures, at equity |  | $ 83,903 | $ 85,867
Mid-Atlantic Office Venture |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage | 40.00% | 40.00% |
Ownership percentage of total common equity | 20.00% |  |
Joint venture, funding from debt | $ 147,400 |  |
Proceeds from issuance of secured debt | $ 120,800 |  |
Mid-Atlantic Office Venture | Mid-Atlantic Office JV Loan | Maximum |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Debt instrument, interest rate, stated percentage |  | 5.70% |
Mid-Atlantic Office Venture | Mid-Atlantic Office JV Loan | LIBOR |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Basis spread on interest rate (as percent) |  | 3.15% |
Mid-Atlantic Office Venture | Preferred Equity Securities |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage | 25.00% |  |
Investment in real estate ventures, at equity | $ 20,000 |  |
Mid-Atlantic Office Venture | Common Equity Securities |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage | 15.00% |  |
Office Properties | Mid-Atlantic Office Venture |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Number of real estate properties | property | 12 |  |
Rentable square feet | ft² | 1,128,645 |  |
Aggregate sales price | $ 192,900 |  |
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 | Metropolitan Washington, D.C. |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Number of real estate properties | property | 3 |  |

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