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SUBSEQUENT EVENTS (Details)
1 Months Ended 2 Months Ended 12 Months Ended 184 Months Ended
Oct. 14, 2022
USD ($)
Jan. 31, 2023
$ / item
Mar. 13, 2023
shares
Dec. 31, 2022
USD ($)
shares
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2022
USD ($)
$ / item
shares
Dec. 12, 2022
USD ($)
ft²
Oct. 04, 2022
Subsequent events                  
Number of depository receipts repurchased | shares             1,488,460    
Repurchase price of depository receipts (in dollars per receipt) | $ / item             30.14    
Total cost of repurchase       $ 5,326,973 $ 450,258 $ 394,031 $ 50,495,000    
Units required to be repurchased (in shares) | shares       2,261 240 222      
Total property cost       $ 400,703,910 $ 400,588,242   $ 400,703,910    
Modification agreement with Brookline Bank. | Extending the maturity until October 14, 2032                  
Subsequent events                  
Existing loan amount $ 5,954,546.14                
Interest rate (as a percent)                 4.60%
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%                
Purchase and sale agreement | Property located at 659 Worcester Road, Framingham, MA. | Commercial                  
Subsequent events                  
Area of property (in square feet) | ft²               20,700  
Purchase deposit               $ 500,000  
Purchase and sale agreement | Property located at 659 Worcester Road, Framingham, MA. | Residential buildings                  
Subsequent events                  
Total property cost               $ 10,151,000  
Class B                  
Subsequent events                  
Total cost of repurchase       $ 1,011,403 85,492 $ 74,870      
Units required to be repurchased (in shares) | shares       429.65          
General Partnership                  
Subsequent events                  
Total cost of repurchase       $ 53,232 $ 4,500 $ 3,941      
Units required to be repurchased (in shares) | shares       22.61          
Subsequent event                  
Subsequent events                  
Number of depository receipts repurchased | shares     0            
Quarterly distributions per depositary receipt (in dollars per receipt) | $ / item   0.32              
Quarterly distribution per unit approved (in dollars per unit) | $ / item   9.60              
Quarterly distribution per unit (in dollars per unit) | $ / item   0.32              
Special distribution per unit (in dollars per unit) | $ / item   38.40              
Special distribution per depository receipt (in dollars per receipt) | $ / item   1.28