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INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES - JGB Ventures (Details) - a | Dec. 31, 2019 | May 29, 2015
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JBG 1250 First Street Office |  |
Schedule of Equity Method Investments [Line Items] |  |
Ownership percentage | 70.00% | 70.00%
Area owned by real estate venture of undeveloped parcels of land |  | 0.5
JBG 51 N 50 Patterson |  |
Schedule of Equity Method Investments [Line Items] |  |
Ownership percentage | 70.00% |
Area owned by real estate venture of undeveloped parcels of land |  | 0.9
JBG Ventures | JBG 1250 First Street Office |  |
Schedule of Equity Method Investments [Line Items] |  |
Ownership percentage |  | 30.00%

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