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INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Details)
1 Months Ended 9 Months Ended 12 Months Ended
Feb. 28, 2007
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Sep. 30, 2018
USD ($)
property
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Sep. 30, 2017
USD ($)
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Dec. 31, 2017
USD ($)
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INVESTMENT IN UNCONSOLIDATED JOINT VENTURES        
Number of limited partnerships and limited liability companies in which the entity has invested   8    
Number of partnerships investing in commercial property   3    
Investments in joint venture | $   $ 1,804,747 $ 8,452,484 $ 7,212,044
Number of units     1,033  
Outstanding amount of mortgage | $   252,781,336   $ 233,221,258
Number of units sold     297  
Number of units retained for long-term investment     (690)  
Unsold units     46  
Distribution to the Partnership | $   3,358,443 $ 3,358,648  
Investment Properties        
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES        
Investments in joint venture | $   $ 1,804,747    
Number of units | property   913    
Number of units sold | property   217    
Number of units retained for long-term investment | property   (690)    
Unsold units | property   6    
Hamilton Bay Apts        
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES        
Number of units sold       29
Number of units refinanced 48      
Gain on the sale of real estate | $       $ 3,628,000
Hamilton Bay Sales        
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES        
Number of units sold   15    
Gain on the sale of real estate | $   $ 2,198,000    
345 Franklin | Mortgages payable        
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES        
Outstanding amount of mortgage | $   $ 9,601,000    
Condominium        
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES        
Number of units   19    
Residential buildings        
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES        
Number of units     1,030  
Residential buildings | Investment Properties        
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES        
Number of units | property   910    
Commercial        
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES        
Number of units     3  
Commercial | Investment Properties        
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES        
Number of units | property   3    
Minimum | Mortgages payable        
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES        
Interest rate (as a percent)   3.76%    
Minimum | Harold Brown        
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES        
Ownership interest (as a percent)   43.20%    
Maximum | Mortgages payable        
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES        
Interest rate (as a percent)   5.81%    
Maximum | Harold Brown        
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES        
Ownership interest (as a percent)   56.00%