INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Mortgage Maturities) (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
3/31/2019	$ 205,532
3/31/2020	213,629
3/31/2021	222,044
3/31/2022	230,791
3/31/2023	17,139,883
Thereafter	149,242,892
Total	167,254,771
Less: unamortized deferred financing costs	(850,515)
Debt maturities net of unamortized deferred financing costs	$ 166,404,256	$ 166,492,692	$ 124,145,012
Weighted average interest rate (as a percent)	4.03%
Effective interest rate (as a percent)	4.09%
Hamilton Essex 81
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Thereafter	$ 10,000,000
Total	10,000,000
Less: unamortized deferred financing costs	(79,287)
Debt maturities net of unamortized deferred financing costs	9,920,713	9,906,924	9,893,135
345 Franklin
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
3/31/2019	205,532
3/31/2020	213,629
3/31/2021	222,044
3/31/2022	230,791
3/31/2023	239,883
Thereafter	8,242,892
Total	9,354,771
Less: unamortized deferred financing costs	(56,597)
Debt maturities net of unamortized deferred financing costs	9,298,174	9,489,257	9,672,846
Hamilton Minuteman
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Thereafter	6,000,000
Total	6,000,000
Less: unamortized deferred financing costs	(95,815)
Debt maturities net of unamortized deferred financing costs	5,904,185	5,896,001	5,887,818
Hamilton on Main Apts
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
3/31/2023	16,900,000
Total	16,900,000
Less: unamortized deferred financing costs	(74,906)
Debt maturities net of unamortized deferred financing costs	16,825,094	16,809,043	16,792,991
Dexter Park
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Thereafter	125,000,000
Total	125,000,000
Less: unamortized deferred financing costs	(543,910)
Debt maturities net of unamortized deferred financing costs	$ 124,456,090	$ 124,391,467	$ 81,898,222