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Investments in and Advances to Unconsolidated Real Estate Ventures - Summary of Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Equity Method Investments and Joint Ventures [Abstract] |  |
Variable rate, weighted average interest rate | 4.10% |
Variable rate | $ 629,479 | $ 461,704
Fixed rate, weighted average interest rate | 3.98% |
Fixed rate | $ 561,236 | 665,662
Unconsolidated real estate ventures - mortgages payable | 1,190,715 | 1,127,366
Unamortized deferred financing costs | (2,859) | (1,998)
Unconsolidated real estate ventures - mortgages payable, net | $ 1,187,856 | $ 1,125,368

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