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INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (345 Franklin) (Details)
1 Months Ended 3 Months Ended
Jun. 30, 2013
USD ($)
Mar. 31, 2016
USD ($)
item
Mar. 31, 2015
USD ($)
item
Dec. 31, 2015
USD ($)
Nov. 30, 2001
USD ($)
item
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES          
Investments in joint venture   $ 7,440,487   $ 7,819,162  
Distribution to the Partnership   936,925 $ 951,330    
Outstanding amount of mortgage   214,311,243   $ 194,500,820  
345 Franklin | Mortgages payable          
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES          
Mortgage amount   $ 9,918,000      
Maximum | Mortgages payable          
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES          
Interest rate (as a percent)   5.97%      
345 Franklin          
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES          
Investments in joint venture         $ 1,533,000
Ownership interest (as a percent)         50.00%
Number of units | item   40 40   40
Distribution to the Partnership $ 1,610,000        
345 Franklin | Mortgages payable          
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES          
Term of debt 15 years        
Interest rate (as a percent) 3.87%        
Period for which the entity is required to make interest only payments 3 years        
Amortization period of debt 30 years        
Repayment of loan $ 6,776,000        
Borrowings $ 10,000,000        
345 Franklin | Residential buildings          
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES          
Number of units | item   40 40