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MORTGAGE NOTES PAYABLE AND LINE OF CREDIT (Mortgage by property) (Details) - Mortgages payable - USD ($) |  |  |  |  |  |  |  | 1 Months Ended |
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Jul. 11, 2014 | Jun. 11, 2014 | Dec. 20, 2013 | Dec. 20, 2013 | Oct. 02, 2013 | Jul. 07, 2013 | Mar. 11, 2013 | Mar. 11, 2013 | Feb. 25, 2013 | Feb. 28, 2014 | Dec. 31, 2015
Hamilton Green |  |  |  |  |  |  |  |  |  |  |
MORTGAGE NOTES PAYABLE |  |  |  |  |  |  |  |  |  |  |
Amount of mortgage paid off |  |  | $ 40,000,000 |  |  |  |  |  |  |  |
Term of debt |  |  |  | 15 years |  |  |  |  |  |  |
Mortgage amount |  |  | $ 38,500,000 | $ 38,500,000 |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 4.67% | 4.67% |  |  |  |  |  |  |
Period for which the entity is required to make interest only payments |  |  | 2 years | 2 years |  |  |  |  |  |  |
Amortization period of debt |  |  | 30 years | 30 years |  |  |  |  |  |  |
Additional capital required for refinancing |  |  | $ 1,846,000 | $ 1,846,000 |  |  |  |  |  |  |
Refinancing costs |  |  | $ 346,000 |  |  |  |  |  |  |  |
NERA Dean Street Associates, LLC |  |  |  |  |  |  |  |  |  |  |
MORTGAGE NOTES PAYABLE |  |  |  |  |  |  |  |  |  |  |
Mortgage amount |  | $ 5,687,000 |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 4.22% |  |  |  |  |  |  |  |  |
Period for which the entity is required to make interest only payments |  | 10 years |  |  |  |  |  |  |  |  |
Amount of loan proceeds utilized for pay off the existing mortgage |  | $ 5,077,000 |  |  |  |  |  |  |  |  |
Refinancing costs |  | $ 89,000 |  |  |  |  |  |  |  |  |
Westgate Apartments LLC |  |  |  |  |  |  |  |  |  |  |
MORTGAGE NOTES PAYABLE |  |  |  |  |  |  |  |  |  |  |
Term of debt |  |  |  |  | 10 years |  |  |  |  |  |
Mortgage amount |  |  |  |  | $ 15,700,000 |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 4.65% |  |  |  |  |  |
Amount of loan proceeds utilized for pay off the existing mortgage |  |  |  |  | $ 7,616,000 |  |  |  |  |  |
Refinancing costs |  |  |  |  | $ 190,000 |  |  |  |  |  |
Hamilton Cypress LLC Commercial-1031Exchange Brookline, Massachusetts |  |  |  |  |  |  |  |  |  |  |
MORTGAGE NOTES PAYABLE |  |  |  |  |  |  |  |  |  |  |
Amount of mortgage paid off |  |  |  |  |  |  |  |  | $ 3,967,000 |  |
Mortgage prepayment penalties |  |  |  |  |  |  |  |  | $ 0 |  |
Property located at School Street |  |  |  |  |  |  |  |  |  |  |
MORTGAGE NOTES PAYABLE |  |  |  |  |  |  |  |  |  |  |
Mortgage amount |  |  |  |  |  |  | $ 15,000,000 | $ 15,000,000 |  |  |
Interest rate (as a percent) |  |  |  |  |  |  | 3.76% | 3.76% |  |  |
Period for which the entity is required to make interest only payments |  |  |  |  |  |  | 3 years |  |  |  |
Amortization period of debt |  |  |  |  |  |  | 30 years |  |  |  |
Amount of loan proceeds utilized for pay off the existing mortgage |  |  |  |  |  |  | $ 15,284,000 | $ 15,284,000 |  |  |
Refinancing costs |  |  |  |  |  |  |  | $ 159,000 |  |  |
Boylston Downtown L.P. Residential Apartments Boston, Massachusetts |  |  |  |  |  |  |  |  |  |  |
MORTGAGE NOTES PAYABLE |  |  |  |  |  |  |  |  |  |  |
Term of debt |  |  |  |  |  | 15 years |  |  |  |  |
Mortgage amount |  |  |  |  |  | $ 40,000,000 |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  | 3.97% |  |  |  |  |
Period for which the entity is required to make interest only payments |  |  |  |  |  | 3 years |  |  |  |  |
Amortization period of debt |  |  |  |  |  | 30 years |  |  |  |  |
Amount of loan proceeds utilized for pay off the existing mortgage |  |  |  |  |  | $ 19,500,000 |  |  |  |  |
Net proceeds from the loan - cash back |  |  |  |  |  | 20,000,000 |  |  |  |  |
Refinancing costs |  |  |  |  |  | $ 279,000 |  |  |  |  |
Hamilton Linewt LLC Commercial-1031 Exchange Newton, Massachusetts |  |  |  |  |  |  |  |  |  |  |
MORTGAGE NOTES PAYABLE |  |  |  |  |  |  |  |  |  |  |
Amount of mortgage paid off |  |  |  |  |  |  |  |  |  | $ 1,466,000 |
Linhart L.P. Residential/Commercial Newton, Massachusetts |  |  |  |  |  |  |  |  |  |  |
MORTGAGE NOTES PAYABLE |  |  |  |  |  |  |  |  |  |  |
Amount of mortgage paid off |  |  |  |  |  |  |  |  |  | $ 1,926,000 |
Westgate Apartments Residential Units Burlington Massachusetts Member |  |  |  |  |  |  |  |  |  |  |
MORTGAGE NOTES PAYABLE |  |  |  |  |  |  |  |  |  |  |
Mortgage amount | $ 2,500,000 |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) | 4.31% |  |  |  |  |  |  |  |  |  |
Period for which the entity is required to make interest only payments | 10 years |  |  |  |  |  |  |  |  |  |
Amount of loan proceeds utilized for pay off the existing mortgage | $ 2,010,000 |  |  |  |  |  |  |  |  |  |
Refinancing costs | $ 75,000 |  |  |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |
MORTGAGE NOTES PAYABLE |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  | 3.76%
Maximum |  |  |  |  |  |  |  |  |  |  |
MORTGAGE NOTES PAYABLE |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  | 5.97%

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