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MORTGAGE NOTES PAYABLE (Mortgage by property) (Details) | May 31, 2019 USD ($) | Mar. 29, 2018 USD ($) item | Mar. 12, 2018 USD ($) | Jun. 30, 2019 USD ($) property | Jun. 30, 2018 property | Aug. 31, 2014 | Dec. 31, 2005 | Mar. 07, 2005 item
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MORTGAGE NOTES PAYABLE |  |  |  |  |  |  |  |
Number of units | property |  |  |  |  | 913 |  |  |
Loan balance |  |  |  | $ 253,362,000 |  |  |  |
Residences at Captain Parkers LLC Residential Apartments Lexington, Massachusetts |  |  |  |  |  |  |  |
MORTGAGE NOTES PAYABLE |  |  |  |  |  |  |  |
Loan amount | $ 20,750,000 |  |  |  |  |  |  |
Interest rate (as a percent) | 4.05% |  |  |  |  |  |  |
Loan balance | $ 20,071,000 |  |  |  |  |  |  |
Mortgage prepayment penalties | $ 202,000 |  |  |  |  |  |  |
Hamilton Essex 81 |  |  |  |  |  |  |  |
MORTGAGE NOTES PAYABLE |  |  |  |  |  |  |  |
Number of units |  |  |  | 49 | 49 |  |  | 48
Webster Green Apartments |  |  |  |  |  |  |  |
MORTGAGE NOTES PAYABLE |  |  |  |  |  |  |  |
Number of units | item |  | 79 |  |  |  |  |  |
Loan amount |  | $ 21,500,000 |  |  |  |  |  |
Purchase price of real estate properties |  | 34,500,000 |  |  |  |  |  |
Cash payment |  | 13,000,000 |  |  |  |  |  |
Cash from reserves |  | 5,000,000 |  |  |  |  |  |
Line of credit |  | 8,000,000 |  |  |  |  |  |
Closing Costs |  | $ 141,000 |  |  |  |  |  |
659 Worcester Road |  |  |  |  |  |  |  |
MORTGAGE NOTES PAYABLE |  |  |  |  |  |  |  |
Loan amount |  |  | $ 6,083,683 |  |  |  |  |
Closing Costs |  |  | $ 69,000 |  |  |  |  |
Interest rate (as a percent) |  |  | 4.87% |  |  |  |  |
Amortization period of debt |  |  | 30 years |  |  |  |  |
Future monthly payment amount |  |  | $ 32,427 |  |  |  |  |
Debt Instrument, Amortization Term |  |  | 30 years |  |  |  |  |
Mortgages payable | Hamilton on Main Apartments, LLC |  |  |  |  |  |  |  |
MORTGAGE NOTES PAYABLE |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  | 4.34% | 5.18% |
Amortization period of debt |  |  |  |  |  |  | 30 years |
Debt Instrument, Amortization Term |  |  |  |  |  |  | 30 years |
Mortgages payable | Minimum |  |  |  |  |  |  |  |
MORTGAGE NOTES PAYABLE |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 3.76% |  |  |  |
Mortgages payable | Maximum |  |  |  |  |  |  |  |
MORTGAGE NOTES PAYABLE |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 5.81% |  |  |  |

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