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INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES - Schedule of Investment in Real Estate Ventures and Share of Real Estate Ventures' Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Nov. 30, 2022 | Feb. 02, 2021 | Dec. 21, 2020
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Carrying Amount | $ 532,224 | $ 411,110 |  |  |  |
Company's Share of unconsolidated real estate venture Income (Loss) | (22,016) | (26,697) | $ (18,584) |  |  |
Unconsolidated Real Estate Venture Debt at 100%, gross | $ 1,204,779 | 961,509 |  |  |  |
Commerce Square Venture |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership Percentage | 70.00% |  |  |  |  |
Carrying Amount | $ 238,105 | 247,798 |  |  |  |
Company's Share of unconsolidated real estate venture Income (Loss) | (12,128) | (15,501) | (9,150) |  |  |
Unconsolidated Real Estate Venture Debt at 100%, gross | $ 206,737 | 213,069 |  |  |  |
Mid-Atlantic Office Venture |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership Percentage | 40.00% |  |  |  |  | 40.00%
Carrying Amount | $ 31,005 | 31,680 |  |  |  |
Company's Share of unconsolidated real estate venture Income (Loss) | 412 | 932 | 96 |  |  |
Unconsolidated Real Estate Venture Debt at 100%, gross | $ 128,904 | 123,015 |  |  |  |
Brandywine - AI Venture LLC |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership Percentage | 50.00% |  |  |  |  |
Carrying Amount | $ 0 | 0 |  |  |  |
Company's Share of unconsolidated real estate venture Income (Loss) | 0 | (721) | 185 |  |  |
Unconsolidated Real Estate Venture Debt at 100%, gross | $ 0 | 0 |  |  |  |
Herndon Innovation Center Metro Portfolio Venture, LLC |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership Percentage | 15.00% |  |  |  |  |
Carrying Amount | $ 15,304 | 15,844 |  |  |  |
Company's Share of unconsolidated real estate venture Income (Loss) | (536) | (174) | (358) |  |  |
Unconsolidated Real Estate Venture Debt at 100%, gross | $ 207,302 | 207,302 |  |  |  |
MAP Venture |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership Percentage | 50.00% |  |  |  |  |
Carrying Amount | $ (35,411) | (24,396) |  |  |  |
Company's Share of unconsolidated real estate venture Income (Loss) | (8,340) | (8,683) | (6,570) |  |  |
Unconsolidated Real Estate Venture Debt at 100%, gross | $ 182,053 | 184,263 |  |  |  |
Cira Square |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership Percentage | 20.00% |  |  |  |  |
Carrying Amount | $ 27,815 | 0 |  |  |  |
Company's Share of unconsolidated real estate venture Income (Loss) | (985) | 0 | 0 |  |  |
Unconsolidated Real Estate Venture Debt at 100%, gross | $ 257,700 | 0 |  |  |  |
4040 Wilson Venture |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership Percentage | 50.00% |  |  |  |  |
Carrying Amount | $ 29,633 | 31,059 |  |  |  |
Company's Share of unconsolidated real estate venture Income (Loss) | (1,211) | (2,258) | (2,162) |  |  |
Unconsolidated Real Estate Venture Debt at 100%, gross | $ 145,070 | 145,000 |  |  |  |
1919 Venture |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership Percentage | 50.00% |  |  | 50.00% |  |
Carrying Amount | $ 0 | 13,791 |  |  |  |
Company's Share of unconsolidated real estate venture Income (Loss) | 1,392 | 427 | 59 |  |  |
Unconsolidated Real Estate Venture Debt at 100%, gross | $ 0 | 88,860 |  |  |  |
3025 JFK Venture |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership Percentage | 55.00% |  |  |  | 55.00% |
Carrying Amount | $ 57,630 | 56,370 |  |  |  |
Company's Share of unconsolidated real estate venture Income (Loss) | (35) | (118) | 0 |  |  |
Unconsolidated Real Estate Venture Debt at 100%, gross | $ 60,118 | 0 |  |  |  |
JBG 51 N Street |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership Percentage | 70.00% |  |  |  |  |
Carrying Amount | $ 21,208 | 21,213 |  |  |  |
Company's Share of unconsolidated real estate venture Income (Loss) | (382) | (402) | (457) |  |  |
Unconsolidated Real Estate Venture Debt at 100%, gross | $ 0 | 0 |  |  |  |
JBG 1250 First Street Office |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership Percentage | 70.00% |  |  |  |  |
Carrying Amount | $ 17,759 | 17,751 |  |  |  |
Company's Share of unconsolidated real estate venture Income (Loss) | (195) | (199) | (227) |  |  |
Unconsolidated Real Estate Venture Debt at 100%, gross | $ 0 | 0 |  |  |  |
3151 Market Street Venture |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership Percentage | 55.00% |  |  |  |  |
Carrying Amount | $ 63,751 | 0 |  |  |  |
Company's Share of unconsolidated real estate venture Income (Loss) | (8) | 0 | 0 |  |  |
Unconsolidated Real Estate Venture Debt at 100%, gross | $ 0 | 0 |  |  |  |
One Uptown - Office |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership Percentage | 50.00% |  |  |  |  |
Carrying Amount | $ 34,980 | 0 |  |  |  |
Company's Share of unconsolidated real estate venture Income (Loss) | 0 | 0 | 0 |  |  |
Unconsolidated Real Estate Venture Debt at 100%, gross | $ 16,895 | 0 |  |  |  |
One Uptown - Multifamily |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership Percentage | 50.00% |  |  |  |  |
Carrying Amount | $ 30,445 | 0 |  |  |  |
Company's Share of unconsolidated real estate venture Income (Loss) | 0 | 0 | $ 0 |  |  |
Unconsolidated Real Estate Venture Debt at 100%, gross | $ 0 | $ 0 |  |  |  |

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