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MORTGAGE NOTES PAYABLE (Details) - 10Q (USD $)
 9 Months Ended 85 Months Ended 0 Months Ended 0 Months Ended 9 Months Ended 0 Months Ended 0 Months Ended 0 Months Ended 0 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended 0 Months Ended 1 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Jul. 31, 2014
Line of Credit [Member]
Sep. 30, 2014
Line of Credit [Member]
Jul. 31, 2014
Line of Credit [Member]
item
Jul. 31, 2014
Base Rate [Member]
Line of Credit [Member]
Jul. 31, 2014
Prime Rate [Member]
Line of Credit [Member]
Jul. 31, 2014
Federal Funds Rate [Member]
Line of Credit [Member]
Jul. 31, 2014
London Interbank Offered Rate (LIBOR) [Member]
Line of Credit [Member]
Jul. 15, 2013
Hamilton Green
Jul. 31, 2014
Minimum
Line of Credit [Member]
Jul. 31, 2014
Minimum
Base Rate [Member]
Line of Credit [Member]
Jul. 31, 2014
Maximum
Line of Credit [Member]
Jul. 31, 2014
Maximum
Base Rate [Member]
Line of Credit [Member]
Sep. 30, 2014
Mortgages payable
Dec. 20, 2013
Mortgages payable
Hamilton Green
Dec. 20, 2013
Mortgages payable
Hamilton Green
Jun. 11, 2014
Mortgages payable
NERA Dean Street Associates, LLC
Jun. 11, 2014
Mortgages payable
NERA Dean Street Associates, LLC
Oct. 01, 2013
Mortgages payable
Westgate Apartments LLC
Oct. 01, 2013
Mortgages payable
Westgate Apartments LLC
Jul. 11, 2014
Mortgages payable
Westgate Apartments Burlington LLC [Member]
Jul. 11, 2014
Mortgages payable
Westgate Apartments Burlington LLC [Member]
Feb. 25, 2013
Mortgages payable
Hamilton Cypress LLC Commercial-1031Exchange Brookline, Massachusetts
Feb. 28, 2014
Mortgages payable
Hamilton Cypress LLC Commercial-1031Exchange Brookline, Massachusetts
Mar. 11, 2013
Mortgages payable
Property located at School Street
Mar. 11, 2013
Mortgages payable
Property located at School Street
Jul. 07, 2013
Mortgages payable
Boylston Downtown L.P. Residential Apartments Boston, Massachusetts
Jul. 07, 2013
Mortgages payable
Boylston Downtown L.P. Residential Apartments Boston, Massachusetts
Feb. 28, 2014
Mortgages payable
Hamilton Linewt LLC Commercial-1031Exchange Newton, Massachusetts
Feb. 28, 2014
Mortgages payable
Linhart L.P. Residential/Commercial Newton, Massachusetts
Sep. 30, 2014
Mortgages payable
Minimum
Sep. 30, 2014
Mortgages payable
Maximum
MORTGAGE NOTES PAYABLE                                                                    
Interest rate (as a percent)                                   4.67%   4.22%   4.65%   4.31%       3.70%   3.97%     3.76% 5.97%
Amount of monthly installments including principal                               $ 808,000                                    
Weighted average interest rate (as a percent)                               4.81%                                    
Effective interest rate (as a percent) 5.46%   5.46%                         4.92%                                    
Annual maturities of mortgage debt                                                                    
2015-current maturities 133,000   133,000                                                              
2016 726,000   726,000                                                              
2017 1,821,000   1,821,000                                                              
2018 7,840,000   7,840,000                                                              
2019 1,912,000   1,912,000                                                              
Thereafter 183,671,000   183,671,000                                                              
Total 196,103,000   196,103,000                                                              
Long-term Debt, Maturities, Repayments of Principal in Next Rolling Twelve Months 133,000   133,000                                                              
Additional disclosures related to mortgages                                                                    
Amount of mortgage paid off                                 40,000,000               3,967,000           1,466,000 1,926,000    
Mortgage prepayment penalties                                                 0 0                
Amount of new loan                                 38,500,000   5,687,000   15,700,000           15,000,000   40,000,000          
Period of interest only payments on loans                                 2 years   10 years   10 years   10 years       3 years              
Term of debt       3 years                         15 years                       15 years          
Period for which the entity is required to make interest only payments                                 2 years                       3 years          
Amortization period of debt                                 30 years                   30 years   30 years          
Amount of loan proceeds utilized for pay off the existing mortgage                                   1,846,000   5,077,000   7,616,000   2,010,000       15,284,000   19,500,000        
Deferred financing cost associated with mortgage                                                       159,000            
Net proceed from the loan - cash back                                                           20,000,000        
Refinancing cost                                 346,000   89,000   190,000               279,000          
Closing costs associated with financing                     38,000           346,000                                  
Amount of new loan                                   38,500,000           2,500,000                    
Repurchase of depository receipts 25,920   1,268,811                                                              
Repurchase price of depository receipts $ 47.22   $ 25.32                                                              
Repurchase price of units $ 1,416.60                                                                  
Repurchase of depository receipts 1,258,399                                                                  
Repurchase of units 1,080 905                                                                
Total cost of repurchase 1,564,397 1,021,987 34,045,000                                                              
Amount of refinancing costs           125,000                                   75,000                    
Maximum borrowings           25,000,000                                                        
Reference rate used in calculation of Base Rate             base Prime Federal Funds one month LIBOR                                                
Basis of effective interest rate used in calculation of Base Rate (as a percent)                 0.50% 1.00%                                                
Debt Instrument, Basis Spread on Variable Rate                         2.50%   3.50%                                      
Funds drawn by the company         $ 0                                                          
Pledged interests rate of the Partnership's ownership interest (as a percent)                       49.00%   100.00%                                        
Number of properties in which borrowing amount collateralized           23                                                        
Commitment fee for unused amount (as a percent)                       0.15%   0.20%