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RELATED PARTY TRANSACTIONS (Details)
3 Months Ended 12 Months Ended 24 Months Ended
Mar. 31, 2019
USD ($)
item
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
RELATED PARTY TRANSACTIONS        
Management fee as percentage of gross receipts rental revenue 4.00%      
Management fee as a percentage of gross receipts rental revenue of Linewt, LLC 3.00%      
Management fees of related party $ 591,000 $ 560,000    
Management fee 590,610 559,629    
Repairs and maintenance 1,944,231 1,814,283    
Administrative expense 612,757 539,145    
Employer contributions in 401K plan $ 12,000      
Number of limited partnerships and limited liability companies in which the entity has invested | item 8      
Interest expense $ 3,000,289 2,984,210    
Dexter Park        
RELATED PARTY TRANSACTIONS        
Management fee as percentage of gross receipts rental revenue 2.00%      
President of Management Company        
RELATED PARTY TRANSACTIONS        
Quarterly fee for asset management consulting services   18,750    
Harold Brown | Minimum        
RELATED PARTY TRANSACTIONS        
Ownership interest (as a percent) 47.60%      
Harold Brown | Maximum        
RELATED PARTY TRANSACTIONS        
Ownership interest (as a percent) 59.00%      
General Partner or Management Company [Member]        
RELATED PARTY TRANSACTIONS        
Repairs and maintenance $ 108,000      
Administrative expense 90,000      
Commercial brokerage fees 1,000      
Expenses for construction, architectural services and supervision of capital projects 150,000      
Costs related to professional services 349,000 354,000    
Management Company [Member]        
RELATED PARTY TRANSACTIONS        
Reimbursement to related party for payroll transfers 789,000 824,000    
Employer contributions in 401K plan $ 12,000   $ 0  
Number of accounting staff of related party providing bookkeeping and accounting functions | item 14      
Fees for accounting and bookkeeping services $ 31,250 $ 31,250    
Number of employees having ownership interest in the investment properties | item 5      
Fees for accounting and bookkeeping services per year       $ 125,000
Partially owned properties        
RELATED PARTY TRANSACTIONS        
Management fee as percentage of gross receipts rental revenue 4.00%      
Management fee $ 163,000      
Repairs and maintenance 18,000      
Administrative expense 11,000      
Commercial brokerage fees 121,000      
Construction, architectural services and supervision of capital projects 3,000      
Amount paid to related party $ 316,000      
Residential and mixed-use properties | Partially owned properties | Minimum        
RELATED PARTY TRANSACTIONS        
Ownership interest (as a percent) 40.00%      
Residential and mixed-use properties | Partially owned properties | Maximum        
RELATED PARTY TRANSACTIONS        
Ownership interest (as a percent) 50.00%