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MORTGAGE NOTES PAYABLE (Mortgage by property) (Details) | Mar. 29, 2018 USD ($) item | Mar. 12, 2018 USD ($) | Jul. 06, 2017 USD ($) item | Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 item | Sep. 29, 2017 USD ($) | Aug. 31, 2014 | Dec. 31, 2005 | Mar. 07, 2005 item
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MORTGAGE NOTES PAYABLE |  |  |  |  |  |  |  |  |  |
Number of units | item |  |  |  |  |  | 1,033 |  |  |  |
Line of credit |  |  |  | $ 5,000,000 | $ 17,000,000 |  |  |  |  |
Hamilton Essex 81 |  |  |  |  |  |  |  |  |  |
MORTGAGE NOTES PAYABLE |  |  |  |  |  |  |  |  |  |
Number of units | item |  |  |  |  |  | 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 |  |  |  |  |  |  |  |
Woodland Park Apartments LLC Newton Massachusetts |  |  |  |  |  |  |  |  |  |
MORTGAGE NOTES PAYABLE |  |  |  |  |  |  |  |  |  |
Number of units | item |  |  | 126 |  |  |  |  |  |  |
Loan amount |  |  | $ 16,000,000 |  |  |  | $ 22,250,000 |  |  |
Purchase price of real estate properties |  |  | 45,600,000 |  |  |  |  |  |  |
Line of credit |  |  | $ 25,000,000 |  | $ 17,000,000 |  |  |  |  |
Interest rate (as a percent) |  |  | 4.75% |  |  |  | 3.79% |  |  |
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 |
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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