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INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES - Investment in Real Estate Ventures and Share of Real Estate Ventures' Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 11, 2018 | Aug. 01, 2018 | Jun. 26, 2018 | May 29, 2015 | Jul. 31, 2013
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Carrying Amount | $ 120,294 | $ 169,100 | $ 194,621 |  |  |  |  |
Company's Share of Real Estate Venture Income (Loss) | (9,922) | (15,231) | $ (8,306) |  |  |  |  |
Real Estate Venture Debt at 100%, gross | $ 596,007 | $ 370,319 |  |  |  |  |  |
Brandywine - AI Venture LLC |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Ownership percentage | 50.00% | 50.00% | 50.00% |  |  |  |  |
Carrying Amount | $ 10,116 | $ 11,731 |  |  |  |  |  |
Company's Share of Real Estate Venture Income (Loss) | (2,800) | (14,559) | $ (4,465) |  |  |  |  |
Real Estate Venture Debt at 100%, gross | $ 0 | 26,111 |  |  |  |  |  |
Herndon Innovation Center Metro Portfolio Venture, LLC |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Ownership percentage | 15.00% |  |  |  |  |  |  |
Carrying Amount | $ 16,446 | 47,834 |  |  |  |  |  |
Company's Share of Real Estate Venture Income (Loss) | (498) | 83 |  |  |  |  |  |
Real Estate Venture Debt at 100%, gross | $ 207,302 | $ 0 |  |  |  |  |  |
MAP Venture |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Ownership percentage | 50.00% | 50.00% | 50.00% |  |  |  |  |
Carrying Amount | $ (70) | $ 11,173 |  |  |  |  |  |
Company's Share of Real Estate Venture Income (Loss) | (6,102) | (2,155) | $ (3,443) |  |  |  |  |
Real Estate Venture Debt at 100%, gross | $ 185,000 | 185,000 |  |  | $ 180,800 |  |  |
PJP VII |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Ownership percentage | 25.00% |  |  |  |  |  |  |
Carrying Amount | $ 0 | 1,100 |  |  |  |  |  |
Company's Share of Real Estate Venture Income (Loss) | 190 | 157 |  |  |  |  |  |
Real Estate Venture Debt at 100%, gross | $ 0 | 3,777 |  |  |  |  |  |
PJP Two |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Ownership percentage | 30.00% |  |  |  |  |  |  |
Carrying Amount | $ 0 | 663 |  |  |  |  |  |
Company's Share of Real Estate Venture Income (Loss) | 81 | 179 |  |  |  |  |  |
Real Estate Venture Debt at 100%, gross | $ 0 | 2,214 |  |  |  |  |  |
PJP VI |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Ownership percentage | 25.00% |  |  |  |  |  |  |
Carrying Amount | $ 0 | 125 |  |  |  |  |  |
Company's Share of Real Estate Venture Income (Loss) | (185) | 71 |  |  |  |  |  |
Real Estate Venture Debt at 100%, gross | $ 0 | 7,069 |  |  |  |  |  |
DRA Austin Venture |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Ownership percentage | 50.00% |  |  |  |  |  |  |
Carrying Amount | $ 0 | 0 |  |  |  |  |  |
Company's Share of Real Estate Venture Income (Loss) | 0 | 1,687 |  |  |  |  |  |
Real Estate Venture Debt at 100%, gross | $ 0 | 0 |  |  |  |  |  |
1919 Ventures |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Ownership percentage | 50.00% |  |  |  |  | 50.00% |  |
Carrying Amount | $ 17,524 | 19,897 |  |  |  |  |  |
Company's Share of Real Estate Venture Income (Loss) | 328 | 253 |  |  |  |  |  |
Real Estate Venture Debt at 100%, gross | $ 88,860 | $ 88,860 |  |  |  |  |  |
Evo at Cira Centre South Venture |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Ownership percentage | 50.00% | 50.00% | 50.00% |  |  |  |  |
Carrying Amount | $ 0 | $ 0 |  |  |  |  |  |
Company's Share of Real Estate Venture Income (Loss) | 0 | (358) | $ 449 |  |  |  |  |
Real Estate Venture Debt at 100%, gross | $ 0 | 0 |  |  |  |  |  |
4040 Wilson Venture |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Ownership percentage | 50.00% |  |  |  |  |  |  | 50.00%
Carrying Amount | $ 37,002 | 37,371 |  |  |  |  |  |
Company's Share of Real Estate Venture Income (Loss) | (368) | (192) |  |  |  |  |  |
Real Estate Venture Debt at 100%, gross | $ 114,845 | 57,288 |  |  |  |  |  |
JBG 51 N 50 Patterson |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Ownership percentage | 70.00% |  |  |  |  |  |  |
Carrying Amount | $ 21,531 | 21,368 |  |  |  |  |  |
Company's Share of Real Estate Venture Income (Loss) | (313) | (137) |  |  |  |  |  |
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% |  |  |  |  |  | 70.00% |
Carrying Amount | $ 17,745 | 17,838 |  |  |  |  |  |
Company's Share of Real Estate Venture Income (Loss) | (255) | (260) |  |  |  |  |  |
Real Estate Venture Debt at 100%, gross | $ 0 | $ 0 |  |  |  |  |  |
DRA Austin Venture |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Ownership percentage |  |  |  | 50.00% |  |  |  |
Percentage of ownership interests |  |  |  | 50.00% |  |  |  |

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