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RELATED PARTY TRANSACTIONS (Details)
12 Months Ended
Dec. 31, 2021
USD ($)
item
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
RELATED PARTY TRANSACTIONS      
Management fee $ 2,523,943 $ 2,452,814 $ 2,409,151
Repairs and maintenance 10,069,325 8,781,789 9,191,561
Administrative expense 2,476,593 2,209,780 2,495,272
Employer contributions in 401K plan $ 45,000 45,000  
Number of advisory committee meetings | item 4    
Expenses incurred for advisory committee meeting $ 25,000    
Number of audit committee meetings held | item 4    
Expenses incurred for audit committee meeting $ 32,000    
Interest expense 13,629,463 13,705,415 12,201,966
Amount paid to related party $ 168,000 25,000 86,000
Majority of Partnership Properties, Excluding Linewt      
RELATED PARTY TRANSACTIONS      
Management fee as percentage of gross receipts rental revenue 4.00%    
Hamilton Linewt LLC Commercial-1031 Exchange Newton, Massachusetts      
RELATED PARTY TRANSACTIONS      
Management fee as percentage of gross receipts rental revenue 3.00%    
Investment Properties      
RELATED PARTY TRANSACTIONS      
Management fee $ 575,162 580,029 664,341
Repairs and maintenance 2,849,104 2,441,880 2,511,741
Administrative expense $ 403,509 327,697 377,298
Number of limited partnerships and limited liability companies in which the entity has invested | item 7    
Interest expense $ 6,658,595 6,742,727 6,915,193
Investment Properties | Minimum      
RELATED PARTY TRANSACTIONS      
Ownership interest (as a percent) 40.00%    
Investment Properties | Maximum      
RELATED PARTY TRANSACTIONS      
Ownership interest (as a percent) 50.00%    
Hamilton Company/Management Company      
RELATED PARTY TRANSACTIONS      
Number of accounting staff of related party providing bookkeeping and accounting functions | item 14    
Number of employees having ownership interest in the investment properties | item 5    
Hamilton Company/Management Company, Related Party      
RELATED PARTY TRANSACTIONS      
Management fee $ 2,524,000 2,453,000 2,409,000
Related Party Transaction, Services, Excluding Management Fee 1,086,000 1,080,000 1,702,000
Repairs and maintenance 220,000    
Administrative expense 285,000    
Construction, architectural services and supervision of capital projects 581,000    
Reimbursement to related party for payroll transfers 3,640,000 3,535,000 3,384,000
Employer contributions in 401K plan 45,000 45,000 45,000
Fees for accounting and bookkeeping services 125,000 $ 125,000 $ 125,000
Investment Properties | Hamilton Company/Management Company      
RELATED PARTY TRANSACTIONS      
Property Management Fee Revenue And Other Service Revenue 692,000    
Amount received for management fees 575,000    
Amount received for construction, architectural services and supervision of capital projects 55,000    
Amount received for maintenance services 34,000    
Amount received for administrative services $ 28,000    
Number of employees having ownership interest in the investment properties | item 5    
Investment Properties, Excluding Dexter Park | Hamilton Company/Management Company      
RELATED PARTY TRANSACTIONS      
Property management fee received (as a percent) 4.00%    
Dexter Park | Hamilton Company/Management Company      
RELATED PARTY TRANSACTIONS      
Property management fee received (as a percent) 2.00%    
Harold Brown | Investment Properties | Minimum      
RELATED PARTY TRANSACTIONS      
Ownership interest of related party (as a percent) 47.60%    
Harold Brown | Investment Properties | Maximum      
RELATED PARTY TRANSACTIONS      
Ownership interest of related party (as a percent) 59.00% 59.00%  
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 | Investment Properties | Minimum      
RELATED PARTY TRANSACTIONS      
Ownership interest (as a percent) 40.00%    
Residential and mixed-use properties | Partially owned properties | Investment Properties | Maximum      
RELATED PARTY TRANSACTIONS      
Ownership interest (as a percent) 50.00%