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REAL ESTATE INVESTMENTS - Schedule of Acquired Properties (Details) $ in Thousands |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 29, 2022 USD ($) | Jan. 21, 2022 USD ($) a | Nov. 30, 2020 USD ($) ft² | Nov. 05, 2020 USD ($) ft² | Feb. 27, 2020 USD ($) a | Dec. 31, 2022 USD ($) ft² | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Apr. 29, 2022 ft² | Apr. 29, 2022 a
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  | $ 3,446 | $ 0 | $ 41,950 |  |
Area of real estate property | ft² |  |  |  |  |  | 13,578,188 |  |  |  |
Land | 631 Park Avenue |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Land area | a |  | 3.3 |  |  |  |  |  |  |  |
Purchase price |  | $ 3,650 |  |  |  |  |  |  |  |
Land | 3151 Market Street |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Land area |  |  |  |  |  |  |  |  | 0.8 | 0.8
Purchase price | $ 27,349 |  |  |  |  |  |  |  |  |
Lease agreement term (in years) | 99 years |  |  |  |  |  |  |  |  |
Prepaid Rent | $ 19,500 |  |  |  |  |  |  |  |  |
Area of real estate property | ft² |  |  |  |  |  |  |  |  | 500,000 |
Land | 155 King of Prussia Road |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Land area | a |  |  |  |  | 7.75 |  |  |  |  |
Purchase price |  |  |  |  | $ 11,250 |  |  |  |  |
Land | Schuylkill Yards Project |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Area of real estate property | ft² |  |  |  |  |  |  |  |  | 200,000 |
Operating Lease Costs, Capitalized | $ 7,800 |  |  |  |  |  |  |  |  |
Office | 1505-11 Race Street |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Rentable Square Feet | ft² |  |  |  | 119,763 |  |  |  |  |  |
Purchase price |  |  |  | $ 9,700 |  |  |  |  |  |
Office | 250 King of Prussia Road |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Rentable Square Feet | ft² |  |  | 169,843 |  |  |  |  |  |  |
Purchase price |  |  | $ 20,250 |  |  |  |  |  |  |

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