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INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES - Brandywine - AI Venture (Details) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Nov. 09, 2021 USD ($) ft² | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |
Net gain on real estate venture transactions |  | $ 181 | $ 26,718 | $ 2,973
Fairview Properties | Brandywine - AI Venture LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Provision for impairment on assets held for sale |  |  |  | 1,400
Fairview Properties | Brandywine - AI Venture LLC | Brandywine Realty Trust |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Provision for impairment on assets held for sale |  |  |  | $ 700
Falls Church, Virginia | Brandywine - AI Venture LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Rentable area (in square feet) | ft² | 183,618 |  |  |
Aggregate sales price | $ 27,600 |  |  |
Gross proceeds from sale | 12,600 |  |  |
Net gain on real estate venture transactions | $ 3,000 |  |  |

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