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INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Hamilton on Main) (Details)
1 Months Ended 12 Months Ended
Aug. 31, 2014
USD ($)
Dec. 31, 2017
USD ($)
item
Dec. 31, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
item
Dec. 31, 2005
USD ($)
item
May 31, 2008
item
Aug. 31, 2004
USD ($)
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      
Number of units sold | item       242      
Outstanding amount of mortgage   233,221,258 212,709,080        
Distribution to the Partnership   $ 7,985,835 $ 6,729,679 $ 3,785,883      
Hamilton on Main Apts              
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES              
Investments in joint venture       $ 832,780     $ 8,000,000
Ownership interest (as a percent)     50.00% 50.00%     50.00%
Number of units | item   148 148 148     280
Outstanding amount of mortgage   $ 16,900,000          
Hamilton on Main Apts              
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES              
Number of units sold | item           137  
Distribution to the Partnership $ 850,000            
Hamilton on Main Apts | Mortgage, 5.18%, 2005              
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES              
Term of debt         10 years    
Number of buildings | item         3    
Interest rate (as a percent)         5.18%    
Period for which the entity is required to make interest only payments         3 years    
Amortization period of debt         30 years    
Term excluding period for which interest only payments to be made         7 years    
Net proceeds after funding escrow accounts and closing costs         $ 16,700,000    
Repayment of loan $ 15,205,000            
Hamilton on Main Apts | Mortgage, 4.34%, August 2014              
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES              
Term of debt 10 years            
Interest rate (as a percent) 4.34%            
Residential buildings              
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES              
Number of units | item       1,030      
Residential buildings | Hamilton on Main Apts              
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES              
Number of units | item   148 148 148      
Mortgages payable              
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES              
Outstanding amount of mortgage   $ 233,221,000