INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Mortgage Maturities) (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
3/31/2019	$ 197,742
3/31/2020	205,532
3/31/2021	213,629
3/31/2022	222,044
3/31/2023	230,791
Thereafter	166,382,775
Total	167,452,513
Less: unamortized deferred financing costs	(959,821)
Debt maturities net of unamortized deferred financing costs	$ 166,492,692	$ 124,145,012	$ 130,152,298
Weighted average interest rate (as a percent)	3.87%
Effective interest rate (as a percent)	3.98%
Hamilton Essex 81
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Thereafter	$ 10,000,000
Total	10,000,000
Less: unamortized deferred financing costs	(93,076)
Debt maturities net of unamortized deferred financing costs	9,906,924	9,893,135	9,879,346
345 Franklin
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
3/31/2019	197,742
3/31/2020	205,532
3/31/2021	213,629
3/31/2022	222,044
3/31/2023	230,791
Thereafter	8,482,775
Total	9,552,513
Less: unamortized deferred financing costs	(63,256)
Debt maturities net of unamortized deferred financing costs	9,489,257	9,672,846	9,849,225
Hamilton Bay Apts
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Debt maturities net of unamortized deferred financing costs			4,430,574
Hamilton Minuteman
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Thereafter	6,000,000
Total	6,000,000
Less: unamortized deferred financing costs	(103,999)
Debt maturities net of unamortized deferred financing costs	5,896,001	5,887,818	5,879,634
Hamilton on Main Apts
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Thereafter	16,900,000
Total	16,900,000
Less: unamortized deferred financing costs	(90,957)
Debt maturities net of unamortized deferred financing costs	16,809,043	16,792,991	16,776,940
Dexter Park
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Thereafter	125,000,000
Total	125,000,000
Less: unamortized deferred financing costs	(608,533)
Debt maturities net of unamortized deferred financing costs	$ 124,391,467	$ 81,898,222	$ 83,336,579