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RELATED PARTY TRANSACTIONS - Narrative (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 28, 2020
USD ($)
Jul. 31, 2020
USD ($)
Mar. 02, 2020
USD ($)
property
Jul. 31, 2020
USD ($)
shares
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Apr. 23, 2020
USD ($)
Dec. 31, 2019
USD ($)
notesPayable
Related Party Transaction [Line Items]                    
Payments to independent member of Company's board of directors for services rendered       $ 31,250            
Board of Directors Chairman | Secured Notes Payable                    
Related Party Transaction [Line Items]                    
Due to related parties                   $ 630,820
Related party transaction rate             10.00%      
Number of notes payable | notesPayable                   2
Balloon payment due at maturity                 $ 437,862  
Board of Directors Chairman | Secured Notes Payable, Note Two                    
Related Party Transaction [Line Items]                    
Balloon payment due at maturity                 218,931  
Board of Directors Chairman | Secured Notes Payable, Note One                    
Related Party Transaction [Line Items]                    
Balloon payment due at maturity                 $ 218,931  
Santa Clara | Advisor fees                    
Related Party Transaction [Line Items]                    
Amount paid for related party transactions         $ 47,984 $ 47,984 $ 95,967 $ 95,967    
Wirta Trust | Board of Directors Chairman                    
Related Party Transaction [Line Items]                    
Notes payable, related party     $ 4,000,000              
Number of real estate properties under mortgages | property     2              
Related party transaction rate     8.00%              
Wirta Trust | Board of Directors Chairman | Chevron Gas Station, San Jose property                    
Related Party Transaction [Line Items]                    
Repayments of related party debt   $ 2,000,000                
Wirta Trust | Board of Directors Chairman | Chevron Gas Station, Roseville property                    
Related Party Transaction [Line Items]                    
Repayments of related party debt $ 2,000,000                  
Class C                    
Related Party Transaction [Line Items]                    
Number of shares issued for services rendered (in shares) | shares       4,821            
Director                    
Related Party Transaction [Line Items]                    
Due to related parties         $ 101,250   $ 101,250