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INVESTMENT IN UNCONSOLIDATED ENTITY - Entities Equity In Earnings (FY) (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]            
Income from investments in unconsolidated entities $ 74,834 $ 125,658 $ 147,302 $ 146,411 $ 296,780 $ 234,048
The TIC Interest            
Schedule of Equity Method Investments [Line Items]            
Income from investments in unconsolidated entities $ 74,834 $ 125,658 $ 147,302 $ 146,411 296,780 296,691
REIT I            
Schedule of Equity Method Investments [Line Items]            
Income from investments in unconsolidated entities         $ 0 $ (62,643)