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FAIR VALUE MEASUREMENTS (Details) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Mortgage Notes Payable    
Carrying Amount $ 253,584,894 $ 233,221,258
Estimated Fair Value 233,103,625 237,895,708
Partially owned properties    
Mortgage Notes Payable    
Carrying Amount 123,720,733 124,145,012
Estimated Fair Value $ 123,539,032 $ 125,519,974