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INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (345 Franklin) (Details)		1 Months Ended	9 Months Ended
	Oct. 12, 2016 USD ($)	Jun. 30, 2013 USD ($)	Sep. 30, 2020 USD ($) property	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 20, 2019 USD ($)	Nov. 30, 2001 USD ($) item
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Investments in joint venture			$ 1,439,697		$ 1,430,402
Repayment of loan	$ 5,158,000
Distribution to the Partnership			3,506,894	$ 3,525,701
Outstanding amount of mortgage			$ 283,927,890		$ 281,771,246
Maximum
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Mortgage amount						$ 35,000,000
Maximum | Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Interest rate (as a percent)			5.66%
345 Franklin | Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Outstanding amount of mortgage			$ 9,201,000
345 Franklin
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Investments in joint venture							$ 1,533,000
Ownership interest (as a percent)				50.00%			50.00%
Number of units			40	40			40
Distribution to the Partnership		$ 1,610,000
Outstanding amount of mortgage			$ 9,149,766	$ 9,346,663
Legal obligation to fund operating results			$ 0
345 Franklin | Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Term of debt		15 years
Interest rate (as a percent)		3.87%
Period for which the entity is required to make interest only payments		3 years
Amortization period of debt		30 years
Repayment of loan		$ 6,776,000
Borrowings		$ 10,000,000
345 Franklin | Residential buildings
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of units			40	40

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