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INVESTMENT IN UNCONSOLIDATED ENTITY - Investments (Q2) (Details) - USD ($)
Jun. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]      
Investment in unconsolidated entity   $ 10,002,368 $ 10,388,588
The TIC Interest      
Schedule of Equity Method Investments [Line Items]      
Investment in unconsolidated entity $ 9,987,703 $ 10,002,368