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INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Dexter) (Details)
1 Months Ended 12 Months Ended
May 31, 2018
USD ($)
Oct. 28, 2009
USD ($)
item
Oct. 31, 2009
USD ($)
Dec. 31, 2018
USD ($)
item
Dec. 31, 2017
USD ($)
item
Dec. 31, 2016
USD ($)
item
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES            
Investments in joint venture       $ 1,985,680 $ 7,212,044 $ 8,336,505
Number of units | item       1,033 1,033 1,033
Outstanding amount of mortgage       $ 252,370,843 $ 233,221,258  
Distribution to the Partnership       4,477,923 7,985,835 $ 6,729,679
Mortgages payable            
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES            
Outstanding amount of mortgage       $ 252,371,000    
Dexter Park            
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES            
Investments in joint venture   $ 15,925,000     $ 2,943,060 $ 3,522,393
Ownership interest (as a percent)   40.00%   40.00% 40.00% 40.00%
Number of units | item       409 409 409
Outstanding amount of mortgage $ 82,000,000          
Distribution to the Partnership 41,200,000          
Defeasance cost       $ 3,830,000    
Dexter Park            
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES            
Purchase price of real estate properties   $ 129,500,000        
Dexter Park | Mortgage, 5.57%, Due 2019            
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES            
Loan amount     $ 89,914,000      
Interest rate (as a percent)   5.57%        
Period for which the entity is required to make interest only payments     2 years      
Amortization period of debt   30 years        
John Hancock | Dexter Park            
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES            
Loan amount $ 125,000,000          
Interest rate (as a percent) 3.99%          
Outstanding amount of mortgage       125,000,000    
General Partnership            
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES            
Distribution to the Partnership       44,779 $ 79,858 $ 67,297
General Partnership | Dexter Park            
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES            
Distribution to the Partnership $ 16,500,000          
Carrying value $ 0          
Defeasance cost       $ 1,532,000    
Defeasance cost (as a percent)       40.00%    
Residential buildings            
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES            
Number of units | item       1,030 1,030 1,030
Residential buildings | Dexter Park            
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES            
Number of units | item       409 409 409
Residential buildings | Dexter Park            
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES            
Number of units | item   409