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RENTAL PROPERTIES (Details)
3 Months Ended
Jan. 18, 2023
USD ($)
Oct. 14, 2022
USD ($)
Jun. 16, 2022
USD ($)
property
Nov. 30, 2021
USD ($)
property
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
property
Mar. 31, 2023
USD ($)
Mar. 31, 2023
property
Mar. 31, 2023
item
Mar. 31, 2023
ft²
Dec. 31, 2022
USD ($)
Dec. 12, 2022
ft²
RENTAL PROPERTIES                        
Number of commercial shopping centers | item                 2      
Rental properties                        
Total fixed assets             $ 411,850,917       $ 400,703,910  
Less: Accumulated depreciation             (163,321,577)       (159,627,479)  
Total fixed assets, net             248,529,340       241,076,431  
Payment of debt         $ 611,861 $ 600,190            
Line of credit             0       0  
Master Credit Facility [Member]                        
RENTAL PROPERTIES                        
Number of properties | property     4 11                
Rental properties                        
Interest rate (as a percent)     4.33% 2.97%                
Payment of debt     $ 370,650,000 $ 65,305,000                
Mortgage prepayment penalties     834,000 2,700,000                
Proceeds of mortgage notes payable     $ 42,404,000 $ 89,000,000                
Master Credit Facility [Member] | Modification agreement with Brookline Bank.                        
Rental properties                        
Interest rate (as a percent)   4.60%                    
Existing loan amount   $ 5,954,546.14                    
Interest only term   2 years                    
Term of debt   30 years                    
Additional earnout   $ 1,495,453.86                    
Debt service coverage ratio   1.35                    
Threshold percentage of Loan to Value   65.00%                    
Master Credit Facility [Member] | Modification agreement with Brookline Bank. | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]                        
Rental properties                        
Variable interest rate spread   1.70%                    
Land, improvements and parking lots                        
Rental properties                        
Total fixed assets             90,839,091       87,405,897  
Land, improvements and parking lots | Minimum                        
Rental properties                        
Useful Life         15 years              
Land, improvements and parking lots | Maximum                        
Rental properties                        
Useful Life         40 years              
Buildings and improvements                        
Rental properties                        
Total fixed assets             261,724,341       256,035,191  
Buildings and improvements | Minimum                        
Rental properties                        
Useful Life         15 years              
Buildings and improvements | Maximum                        
Rental properties                        
Useful Life         40 years              
Kitchen cabinets                        
Rental properties                        
Total fixed assets             14,744,566       14,347,212  
Kitchen cabinets | Minimum                        
Rental properties                        
Useful Life         5 years              
Kitchen cabinets | Maximum                        
Rental properties                        
Useful Life         10 years              
Carpets                        
Rental properties                        
Total fixed assets             12,609,952       12,047,573  
Carpets | Minimum                        
Rental properties                        
Useful Life         5 years              
Carpets | Maximum                        
Rental properties                        
Useful Life         10 years              
Air conditioning                        
Rental properties                        
Total fixed assets             501,697       501,697  
Air conditioning | Minimum                        
Rental properties                        
Useful Life         5 years              
Air conditioning | Maximum                        
Rental properties                        
Useful Life         10 years              
Laundry equipment                        
Rental properties                        
Total fixed assets             553,140       553,140  
Laundry equipment | Minimum                        
Rental properties                        
Useful Life         5 years              
Laundry equipment | Maximum                        
Rental properties                        
Useful Life         7 years              
Elevators                        
Rental properties                        
Total fixed assets             1,885,265       1,885,265  
Elevators | Minimum                        
Rental properties                        
Useful Life         20 years              
Elevators | Maximum                        
Rental properties                        
Useful Life         40 years              
Swimming pools                        
Rental properties                        
Total fixed assets             1,090,604       1,090,604  
Swimming pools | Minimum                        
Rental properties                        
Useful Life         10 years              
Swimming pools | Maximum                        
Rental properties                        
Useful Life         30 years              
Equipment                        
Rental properties                        
Total fixed assets             19,215,896       18,716,758  
Equipment | Minimum                        
Rental properties                        
Useful Life         5 years              
Equipment | Maximum                        
Rental properties                        
Useful Life         30 years              
Motor vehicles                        
Rental properties                        
Total fixed assets             232,954       171,519  
Motor vehicles | Maximum                        
Rental properties                        
Useful Life         5 years              
Fences                        
Rental properties                        
Total fixed assets             46,872       46,872  
Fences | Minimum                        
Rental properties                        
Useful Life         5 years              
Fences | Maximum                        
Rental properties                        
Useful Life         15 years              
Furniture and fixtures                        
Rental properties                        
Total fixed assets             $ 8,406,539       $ 7,902,182  
Furniture and fixtures | Minimum                        
Rental properties                        
Useful Life         5 years              
Furniture and fixtures | Maximum                        
Rental properties                        
Useful Life         7 years              
Wholly owned properties                        
RENTAL PROPERTIES                        
Number of properties | property               30        
Investment Properties                        
RENTAL PROPERTIES                        
Number of units | property           690   690        
NERA 40%                        
RENTAL PROPERTIES                        
Ownership interest (as a percent)         40.00% 40.00%            
NERA 50%                        
RENTAL PROPERTIES                        
Ownership interest (as a percent)         50.00% 50.00%            
Residential and mixed-use properties | Wholly owned properties                        
RENTAL PROPERTIES                        
Number of units | item                 2,892      
Number of properties | property               25        
Residential and mixed-use properties | Partially owned properties                        
RENTAL PROPERTIES                        
Number of units               688 688      
Rental properties                        
Area of property (in square feet) | ft²                   12,500    
Residential and mixed-use properties | Investment Properties | Partially owned properties                        
RENTAL PROPERTIES                        
Number of properties | item                 7      
Residential and mixed-use properties | Limited Partnerships | Partially owned properties                        
RENTAL PROPERTIES                        
Number of properties | item                 7      
Residential and mixed-use properties | NERA 40% | Partially owned properties | Minimum                        
RENTAL PROPERTIES                        
Ownership interest (as a percent)         40.00%              
Residential and mixed-use properties | NERA 50% | Partially owned properties | Maximum                        
RENTAL PROPERTIES                        
Ownership interest (as a percent)         50.00%              
Condominium | Wholly owned properties                        
RENTAL PROPERTIES                        
Number of units | item                 19      
Number of properties | property               1        
Commercial | Property located at 659 Worcester Road, Framingham, MA.                        
Rental properties                        
Purchase price $ 10,151,000                      
Closing costs $ 59,000                      
Amortization period 12 months                      
Commercial | Property located at 659 Worcester Road, Framingham, MA. | Leases, Acquired-in-Place [Member]                        
Rental properties                        
Purchase price $ 585,000                      
Commercial | Property located at 659 Worcester Road, Framingham, MA. | Customer Relationships [Member]                        
Rental properties                        
Purchase price $ 378,000                      
Commercial | Purchase and sale agreement | Property located at 659 Worcester Road, Framingham, MA.                        
Rental properties                        
Area of property (in square feet) | ft²                       20,700
Commercial | Minimum | Property located at 659 Worcester Road, Framingham, MA. | Leases, Acquired-in-Place [Member]                        
Rental properties                        
Amortization period 20 months                      
Commercial | Maximum | Property located at 659 Worcester Road, Framingham, MA. | Customer Relationships [Member]                        
Rental properties                        
Amortization period 156 months                      
Commercial | Wholly owned properties                        
RENTAL PROPERTIES                        
Number of properties | property               5        
Rental properties                        
Area of property (in square feet) | ft²                   128,096    
Commercial | Investment Properties                        
RENTAL PROPERTIES                        
Number of units | property           3   3