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INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES - Brandywine - AI Venture (Details) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Nov. 09, 2021 USD ($) ft² | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) ft²
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Net gain on real estate venture transactions |  | $ 26,718 | $ 2,973 | $ 75 |
Impairment of properties held for use |  | $ 4,700 |  |  |
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  |  |  | Equity in loss of unconsolidated real estate ventures
Fairview Properties | Brandywine - AI Venture LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Provision for impairment on assets held for sale |  |  | 1,400 |  |
Impairment of properties held for use |  |  |  |  | $ 5,600
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 |  |
Impairment of properties held for use |  |  |  |  | $ 2,800
Falls Church, Virginia | Brandywine - AI Venture LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Rentable square feet | ft² | 183,618 |  |  |  | 180,659
Aggregate sales price | $ 27,600 |  |  |  |
Gross proceeds from sale | 12,600 |  |  |  |
Net gain on real estate venture transactions | $ 3,000 |  |  |  | $ 2,200
Debt, net |  |  |  |  | $ 26,000

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