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REAL ESTATE INVESTMENTS, NET - Dispositions (Q2) (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Feb. 12, 2021
USD ($)
ft²
Jan. 29, 2021
USD ($)
ft²
Jan. 07, 2021
USD ($)
ft²
Jun. 30, 2021
USD ($)
ft²
Mar. 31, 2021
USD ($)
ft²
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
ft²
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
ft²
Dec. 31, 2019
USD ($)
Real Estate [Line Items]                    
Rentable Square Feet | ft²       2,300,000     2,300,000   118,651  
Contract Sale Price                 $ 31,096,403  
Gain (Loss) on Sale       $ 0   $ 0 $ 289,642 $ 0 $ 4,139,749 $ 0
Retail                    
Real Estate [Line Items]                    
Rentable Square Feet | ft²         42,896          
Contract Sale Price         $ 13,714,188          
Gain (Loss) on Sale         $ 289,642          
Retail | Chevron Gas Station, Roseville property                    
Real Estate [Line Items]                    
Rentable Square Feet | ft²     3,300              
Contract Sale Price     $ 4,050,000              
Gain (Loss) on Sale     $ 228,769              
Retail | EcoThrift                    
Real Estate [Line Items]                    
Rentable Square Feet | ft²   38,536                
Contract Sale Price   $ 5,375,300                
Gain (Loss) on Sale   $ 51,415                
Retail | Chevron Gas Station, San Jose property                    
Real Estate [Line Items]                    
Rentable Square Feet | ft² 1,060                  
Contract Sale Price $ 4,288,888                  
Gain (Loss) on Sale $ 9,458