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INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (345 Franklin) (Details)
1 Months Ended 12 Months Ended
Jun. 30, 2013
USD ($)
Dec. 31, 2017
USD ($)
item
Dec. 31, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
item
Nov. 30, 2001
USD ($)
item
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES          
Investments in joint venture   $ 7,212,044 $ 8,336,505 $ 7,819,162  
Number of units | item       1,033  
Distribution to the Partnership   7,985,835 6,729,679 $ 3,785,883  
Outstanding amount of mortgage   233,221,258 $ 212,709,080    
Mortgages payable          
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES          
Outstanding amount of mortgage   $ 233,221,000      
Maximum | Mortgages payable          
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES          
Interest rate (as a percent)   5.97%      
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        
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   $ 9,743,000      
345 Franklin | Mortgage, Paid off June 2013          
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES          
Repayment of loan $ 6,776,000        
Residential buildings          
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES          
Number of units | item       1,030  
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 | Maximum          
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES          
Carrying value $ 0        
345 Franklin | Residential buildings          
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES          
Number of units | item   40 40 40