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MORTGAGE NOTES PAYABLE AND LINE OF CREDIT (Line of Credit) (Details) |  |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 15, 2016 USD ($) | Jan. 07, 2016 USD ($) | Jul. 31, 2014 USD ($) | Dec. 31, 2016 USD ($) item | Dec. 31, 2015 USD ($) | Sep. 18, 2015 USD ($) | Jul. 11, 2014 USD ($) | Jun. 11, 2014 USD ($)
Line of Credit |  |  |  |  |  |  |  |
Credit line balance |  |  |  |  | $ 25,000,000 |  |  |
Residences at Captain Parkers LLC Residential Apartments Lexington, Massachusetts |  |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |
Credit line balance |  | $ 0 |  |  |  | $ 25,000,000 |  |
Amount of loan proceeds and cash reserves utilized to pay off the existing line of credit | $ 2,000,000 | 23,000,000 |  |  |  |  |  |
LIBOR | Residences at Captain Parkers LLC Residential Apartments Lexington, Massachusetts |  |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |
Principal amount |  | $ 20,071,000 |  |  |  |  |  |
LIBOR | Residences at Captain Parkers LLC Residential Apartments Lexington, Massachusetts |  |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |
Margin over basis of interest rate (as a percent) |  | 2.01% |  |  |  |  |  |
Mortgages payable | Westgate Apartments Residential Units Burlington Massachusetts Member |  |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 2,500,000 |
Mortgages payable | NERA Dean Street Associates, LLC |  |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  | $ 5,687,000
Line of Credit |  |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |
Maximum borrowings |  |  | $ 25,000,000 |  |  |  |  |
Term of debt |  |  | 3 years |  |  |  |  |
Amount of refinancing costs |  |  | $ 125,000 |  |  |  |  |
Number of properties in which borrowing amount collateralized | item |  |  |  | 23 |  |  |  |
Commitment fee |  |  |  | $ 50,000 |  |  |  |
Line of Credit | Base Rate |  |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |
Margin over basis of interest rate (as a percent) |  |  | 2.50% |  |  |  |  |
Line of Credit | Federal Funds Rate |  |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |
Basis of effective interest rate used in calculation of Base Rate (as a percent) |  |  | 0.50% |  |  |  |  |
Line of Credit | LIBOR |  |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |
Reference rate used in calculation of Base Rate |  |  | one month LIBOR |  |  |  |  |
Basis of effective interest rate used in calculation of Base Rate (as a percent) |  |  | 1.00% |  |  |  |  |
Line of Credit | Minimum |  |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |
Pledged interests of the Partnership's ownership interest (as a percent) |  |  |  | 49.00% |  |  |  |
Commitment fee for unused amount (as a percent) |  |  |  | 0.15% |  |  |  |
Tangible net worth |  |  |  | $ 150,000,000 |  |  |  |
Ratio of net operating income to total indebtedness |  |  |  | 9.50% |  |  |  |
Debt service coverage ratio |  |  |  | 1.6 |  |  |  |
Line of Credit | Maximum |  |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |
Pledged interests of the Partnership's ownership interest (as a percent) |  |  |  | 100.00% |  |  |  |
Commitment fee for unused amount (as a percent) |  |  |  | 0.20% |  |  |  |
Leverage ratio |  |  |  | 65.00% |  |  |  |
Aggregate increase in indebtedness |  |  |  | $ 15,000,000 |  |  |  |

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