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SUBSEQUENT EVENTS (Details) - USD ($)		3 Months Ended
	Mar. 22, 2018	Jun. 30, 2018	Apr. 11, 2018	Mar. 31, 2018	Mar. 27, 2018	Dec. 31, 2017	Feb. 28, 2007
Subsequent events
Outstanding amount of mortgage				$ 253,584,894		$ 233,221,258
Hamilton Bay Apts
Subsequent events
Interest rate (as a percent)							5.57%
Hamilton Bay Apts | John Hancock
Subsequent events
Rate Lock Deposit Amount	$ 1,290,000				$ 1,290,000
Partnership contribution	1,016,000
Loan amount	$ 125,000,000
Interest rate (as a percent)	3.99%
Outstanding amount of mortgage	$ 82,000,000
Hamilton Bay Apts | John Hancock | Subsequent event
Subsequent events
Rate Lock Deposit Amount			$ 1,250,000
Hamilton Bay Apts | Forecast | John Hancock
Subsequent events
Defeasance cost		$ 3,750,000
Defeasance cost (as a percent)		40.00%
Hamilton Bay Apts | General Partnership | Forecast | John Hancock
Subsequent events
Defeasance cost		$ 1,500,000

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- Definition

The amount the partnership has contributed,

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No definition available.

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- Definition

Represents the percentage of debt extinguishment costs to be paid

+ References

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- Definition

Deposit required for a rate lock confirmation agreement.

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No definition available.

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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