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REAL ESTATE INVESTMENTS - Dispositions (Narrative) (Details) $ in Thousands |  |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 23, 2023 USD ($) ft² | Jul. 14, 2022 USD ($) a ft² | Feb. 02, 2021 USD ($) | Dec. 31, 2022 USD ($) ft² | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Jul. 23, 2021 USD ($) | Feb. 02, 2021 ft² | Feb. 02, 2021 a | Nov. 05, 2020 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Area of real estate property | ft² |  |  |  | 13,578,188 |  |  |  |  |  |
Investment in real estate ventures, at equity |  |  |  | $ 532,224 | $ 411,110 |  |  |  |  |
Net gain on sale of undepreciated real estate |  |  |  | 8,007 | 2,903 | $ 201 |  |  |  |
Net gain on disposition of real estate |  |  |  | $ 17,677 | $ 142 | $ 289,461 |  |  |  |
Land | 3151 Market Street |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Area of real estate property | ft² |  | 500,000 |  |  |  |  |  |  |  |
Land | 3151 Market Street | Subsequent Event |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Area of real estate property | ft² | 200,000 |  |  |  |  |  |  |  |  |
Leasehold Interest | 3151 Market Street |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Lease agreement term (in years) |  | 99 years |  |  |  |  |  |  |  |
Land area | a |  | 0.8 |  |  |  |  |  |  |  |
Sales Price |  | $ 30,394 |  |  |  |  |  |  |  |
Net gain on disposition of real estate |  | $ 2,583 |  |  |  |  |  |  |  |
Leasehold Interest | 3151 Market Street | Subsequent Event |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Sales Price | $ 7,800 |  |  |  |  |  |  |  |  |
Net gain on disposition of real estate | $ 800 |  |  |  |  |  |  |  |  |
3025 JFK Venture |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Lease agreement term (in years) |  |  | 99 years |  |  |  |  |  |  |
Land area |  |  |  |  |  |  |  | 1 | 1 |
Investment in real estate ventures, at equity |  |  | $ 34,800 |  |  |  | $ 34,800 |  |  |
Net gain on sale of undepreciated real estate |  |  | $ 2,000 |  |  |  |  |  |  |
1505-11 Race Street |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Transaction costs capitalized |  |  |  |  |  |  |  |  |  | $ 300

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