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INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Dexter) (Details)			3 Months Ended
	May 31, 2018 USD ($)	Oct. 28, 2009 USD ($) item	Mar. 31, 2021 USD ($) property	Mar. 31, 2020 USD ($) property	Sep. 30, 2018 USD ($)	Dec. 31, 2020 USD ($)
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Investments in joint venture			$ 1,400,524			$ 1,410,769
Outstanding amount of mortgage			282,951,918			$ 283,444,533
Distribution to the Partnership			$ 1,168,860	$ 1,169,173
Dexter Park
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Investments in joint venture		$ 15,925,000
Ownership interest (as a percent)		40.00%		40.00%
Number of units		409	409	409
Purchase price of investments		$ 129,500,000
Outstanding amount of mortgage	$ 82,000,000		$ 124,536,869	$ 124,472,246
Distribution to the Partnership	41,200,000
Dexter Park | Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Loan amount		$ 89,914,000
Interest rate (as a percent)		5.57%
Period for which the entity is required to make interest only payments		2 years
Amortization period of debt		30 years
John Hancock | Dexter Park
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Loan amount	$ 125,000,000
Interest rate (as a percent)	3.99%
Defeasance cost					$ 3,830,000
Defeasance cost (as a percent)					40.00%
General Partnership
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Distribution to the Partnership			$ 11,689	$ 11,692
General Partnership | Dexter Park
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Distribution to the Partnership	$ 16,500,000
General Partnership | John Hancock | Dexter Park
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Defeasance cost					$ 1,532,000
Residential buildings | Dexter Park
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of units | property			409	409

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