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INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (345 Franklin) (Details)
1 Months Ended 12 Months Ended
Jun. 11, 2014
USD ($)
Jun. 30, 2013
USD ($)
Dec. 31, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
item
Dec. 31, 2014
USD ($)
item
Nov. 30, 2001
USD ($)
item
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES            
Investments in joint venture     $ 8,336,505 $ 7,819,162 $ 8,807,868  
Number of units | item         1,033  
Distribution to the Partnership     6,729,679 3,785,883 $ 3,858,386  
Outstanding amount of mortgage     212,709,080 $ 194,500,820    
Mortgages payable            
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES            
Outstanding amount of mortgage     212,709,000      
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     $ 9,926,000      
345 Franklin | Mortgage, Paid off June 2013            
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES            
Repayment of loan   $ 6,776,000        
NERA Dean Street Associates, LLC | Mortgages payable            
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES            
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          
Residential buildings            
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES            
Number of units | item         1,030  
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% 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