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SUBSEQUENT EVENTS - Mortgage Notes Payable (FY) (Details) - USD ($)
Jun. 30, 2021
Mar. 05, 2021
Dec. 31, 2020
Dec. 31, 2019
Subsequent Event [Line Items]        
Principal amount $ 185,758,762   $ 182,948,438  
Levins        
Subsequent Event [Line Items]        
Principal amount $ 2,687,293   2,032,332  
Debt instrument, effective interest rate 3.75%      
Dollar General        
Subsequent Event [Line Items]        
Principal amount $ 2,263,573   2,268,922  
Debt instrument, effective interest rate 3.65%      
GSA (MSHA)        
Subsequent Event [Line Items]        
Principal amount $ 1,743,349   1,752,092  
Debt instrument, effective interest rate 3.65%      
Mortgage Notes Payable        
Subsequent Event [Line Items]        
Principal amount $ 182,758,762   176,948,438 $ 195,739,481
Mortgage Notes Payable | Levins        
Subsequent Event [Line Items]        
Principal amount     $ 2,032,332 2,079,793
Debt instrument, effective interest rate     3.74%  
Mortgage Notes Payable | Levins | Subsequent Event        
Subsequent Event [Line Items]        
Principal amount   $ 2,700,000    
Debt instrument, effective interest rate   3.75%    
Mortgage Notes Payable | Dollar General        
Subsequent Event [Line Items]        
Principal amount     $ 2,268,922  
Debt instrument, effective interest rate     3.38%  
Mortgage Notes Payable | Dollar General | Subsequent Event        
Subsequent Event [Line Items]        
Principal amount   $ 2,280,000    
Debt instrument, effective interest rate   3.65%    
Mortgage Notes Payable | PMI Preclinical        
Subsequent Event [Line Items]        
Principal amount     $ 4,020,418 4,118,613
Debt instrument, effective interest rate     3.38%  
Mortgage Notes Payable | PMI Preclinical | Subsequent Event        
Subsequent Event [Line Items]        
Principal amount   $ 5,400,000    
Debt instrument, effective interest rate   3.75%    
Mortgage Notes Payable | GSA (MSHA)        
Subsequent Event [Line Items]        
Principal amount     $ 1,752,092 $ 1,796,361
Debt instrument, effective interest rate     3.13%  
Mortgage Notes Payable | GSA (MSHA) | Subsequent Event        
Subsequent Event [Line Items]        
Principal amount   $ 1,756,000    
Debt instrument, effective interest rate   3.65%