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INVESTMENT IN UNCONSOLIDATED ENTITY - Narrative (FY) (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 28, 2017 lease
The TIC Interest |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership (as a percent) |  |  | 72.70%
Proceeds from distributions | $ 683,000 | $ 657,435 |
REIT I |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership (as a percent) |  | 4.80% |
Proceeds from distributions |  | $ 372,351 |
Santa Clara |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Number of operating leases with renewal options | lease |  |  | 3
Operating leases renewal term |  |  | 5 years
The TIC Interest | Hagg Lane II, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Percentage by Noncontrolling Owners (as a percent) |  |  | 23.40%
The TIC Interest | Hagg Lane III, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Percentage by Noncontrolling Owners (as a percent) |  |  | 3.90%
Santa Clara |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Percentage by Noncontrolling Owners (as a percent) |  |  | 27.30%

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