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Debt Obligations- Mortgage Payable (Details) - USD ($)
Sep. 30, 2019
Dec. 31, 2018
Debt Obligations    
Mortgages payable, net $ 435,115,000 $ 418,798,000
Mortgages payable    
Debt Obligations    
Mortgages payable, gross 439,417,000 423,096,000
Unamortized deferred financing costs (4,302,000) (4,298,000)
Mortgages payable, net $ 435,115,000 $ 418,798,000