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INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (345 Franklin) (Details)
1 Months Ended 12 Months Ended
Jun. 30, 2013
USD ($)
Dec. 31, 2015
USD ($)
item
Dec. 31, 2014
USD ($)
item
Dec. 31, 2013
USD ($)
item
Nov. 30, 2001
USD ($)
item
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES          
Investments in joint venture   $ 7,819,162 $ 8,807,868 $ 12,025,144  
Distribution to the Partnership   3,785,883 3,858,386 $ 3,893,662  
Outstanding amount of mortgage   195,939,469 $ 196,071,540    
345 Franklin          
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES          
Distribution to the Partnership $ 1,610,000        
345 Franklin | Mortgage, 3.87%, June 2013          
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES          
Term of debt 15 years        
Mortgage amount $ 10,000,000        
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        
Outstanding amount of mortgage   $ 10,000,000      
345 Franklin | Mortgage, Paid off June 2013          
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES          
Repayment of loan $ 6,776,000        
345 Franklin          
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES          
Investments in joint venture         $ 1,533,000
Ownership interest (as a percent)     50.00% 50.00% 50.00%
Number of units | item   40 40 40 40
345 Franklin | Residential buildings          
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES          
Number of units | item   40 40 40  
345 Franklin | Maximum          
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES          
Carrying value $ 0