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MORTGAGE NOTES PAYABLE (Mortgage by property) (Details) - USD ($) |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2015 | Aug. 31, 2014 | Dec. 31, 2005 | Jun. 30, 2017 | Jan. 15, 2016 | Jan. 07, 2016
Line of Credit |  |  |  |  |  |
MORTGAGE NOTES PAYABLE |  |  |  |  |  |
Mortgage amount |  |  |  |  |  | $ 0
Residences at Captain Parkers LLC Residential Apartments Lexington, Massachusetts |  |  |  |  |  |
MORTGAGE NOTES PAYABLE |  |  |  |  |  |
Amount of loan proceeds utilized for pay off the existing mortgage |  |  |  |  | $ 2,000,000 | 23,000,000
Mortgages payable | Hamilton Essex 81 |  |  |  |  |  |
MORTGAGE NOTES PAYABLE |  |  |  |  |  |
Term of debt | 10 years |  |  |  |  |
Amount of loan proceeds utilized for pay off the existing mortgage | $ 8,040,719 |  |  |  |  |
Mortgages payable | Hamilton on Main Apartments, LLC |  |  |  |  |  |
MORTGAGE NOTES PAYABLE |  |  |  |  |  |
Amount of mortgage paid off |  | $ 15,205,000 |  |  |  |
Term of debt |  | 10 years | 10 years |  |  |
Interest rate (as a percent) |  | 4.34% | 5.18% |  |  |
Period for which the entity is required to make interest only payments |  |  | 3 years |  |  |
Amortization period of debt |  |  | 30 years |  |  |
Mortgages payable | Residences at Captain Parkers LLC Residential Apartments Lexington, Massachusetts |  |  |  |  |  |
MORTGAGE NOTES PAYABLE |  |  |  |  |  |
Mortgage amount |  |  |  |  |  | $ 20,071,000
Mortgages payable | Minimum |  |  |  |  |  |
MORTGAGE NOTES PAYABLE |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 2.80% |  |
Mortgages payable | Maximum |  |  |  |  |  |
MORTGAGE NOTES PAYABLE |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 5.97% |  |

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