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INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (345 Franklin) (Details)
1 Months Ended 6 Months Ended
Jun. 30, 2013
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
item
Dec. 31, 2017
USD ($)
Nov. 30, 2001
USD ($)
item
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES          
Investments in joint venture   $ 2,298,588 $ 9,029,233 $ 7,212,044  
Number of units | item     1,033    
Distribution to the Partnership   2,238,962 $ 2,239,168    
Outstanding amount of mortgage   $ 253,185,372   $ 233,221,258  
Maximum | Mortgages payable          
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES          
Interest rate (as a percent)   5.81%      
345 Franklin | Mortgages payable          
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES          
Outstanding amount of mortgage   $ 9,649,000      
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%
Number of units | item     40   40
Distribution to the Partnership $ 1,610,000        
Legal obligation to fund operating results   $ 0      
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