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RELATED PARTY TRANSACTIONS - Narrative (Q2) (Details)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Aug. 28, 2020
USD ($)
Jul. 31, 2020
USD ($)
Mar. 02, 2020
USD ($)
property
Jul. 31, 2020
USD ($)
shares
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
notesPayable
shares
Apr. 23, 2020
USD ($)
Related Party Transaction [Line Items]                      
Due to related parties                 $ 0 $ 630,820  
Payments to independent member of Company's board of directors for services rendered       $ 31,250              
Repayments of related party debt                 0 107,500  
Amount paid for related party transactions                 $ 0    
Advisor fees                      
Related Party Transaction [Line Items]                      
Related party transaction rate                 0.10%    
Amount paid for related party transactions                 $ 263,971    
Board of Directors Chairman | Secured Notes Payable                      
Related Party Transaction [Line Items]                      
Due to related parties                   $ 630,820  
Related party transaction rate             10.00%   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 $ 191,933 $ 191,933  
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                    
Common 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 21,250 57,500  
Payments to independent member of Company's board of directors for services rendered                 $ 407,083 $ 372,500  
Director | Common Class C                      
Related Party Transaction [Line Items]                      
Number of shares issued for services rendered (in shares) | shares                 16,786 10,335