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REAL ESTATE INVESTMENTS - Schedule of Real Estate Properties (FY) (Details) - USD ($) | Jun. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Real Estate [Line Items] |  |  |
Land, Buildings and Improvements | $ 343,899,970 | $ 337,755,793 |
Tenant origination and absorption costs | 23,570,335 | 23,792,057 | $ 27,266,610
Accumulated Depreciation and Amortization | (38,377,298) | (32,091,211) | (20,411,794)
Total Investment in Real Estate Property, Net | 329,093,007 | 329,456,639 | $ 403,535,694
Office | Accredo Health |  |  |
Real Estate [Line Items] |  |  |
Land, Buildings and Improvements | 9,855,847 | 9,855,847 |
Tenant origination and absorption costs | 1,269,350 | 1,269,351 |
Accumulated Depreciation and Amortization | (2,444,918) | (2,221,380) |
Total Investment in Real Estate Property, Net | 8,680,279 | 8,903,818 |
Office | Northrop Grumman |  |  |
Real Estate [Line Items] |  |  |
Land, Buildings and Improvements |  | 12,382,991 |
Tenant origination and absorption costs |  | 1,341,199 |
Accumulated Depreciation and Amortization |  | (2,968,985) |
Total Investment in Real Estate Property, Net |  | 10,755,205 |
Office | exp US Services |  |  |
Real Estate [Line Items] |  |  |
Land, Buildings and Improvements | 6,056,668 | 6,056,668 |
Tenant origination and absorption costs | 388,248 | 388,248 |
Accumulated Depreciation and Amortization | (945,261) | (833,278) |
Total Investment in Real Estate Property, Net | 5,499,655 | 5,611,638 |
Office | Wyndham |  |  |
Real Estate [Line Items] |  |  |
Land, Buildings and Improvements | 10,406,483 | 10,406,483 |
Tenant origination and absorption costs | 669,232 | 669,232 |
Accumulated Depreciation and Amortization | (1,347,468) | (1,170,222) |
Total Investment in Real Estate Property, Net | 9,728,247 | 9,905,493 |
Office | Williams Sonoma |  |  |
Real Estate [Line Items] |  |  |
Land, Buildings and Improvements | 8,079,612 | 8,079,612 |
Tenant origination and absorption costs | 550,486 | 550,486 |
Accumulated Depreciation and Amortization | (1,214,232) | (1,058,455) |
Total Investment in Real Estate Property, Net | 7,415,866 | 7,571,643 |
Office | EMCOR |  |  |
Real Estate [Line Items] |  |  |
Land, Buildings and Improvements | 5,960,610 | 5,960,610 |
Tenant origination and absorption costs | 463,488 | 463,488 |
Accumulated Depreciation and Amortization | (693,863) | (604,163) |
Total Investment in Real Estate Property, Net | 5,730,235 | 5,819,935 |
Office | Cummins |  |  |
Real Estate [Line Items] |  |  |
Land, Buildings and Improvements |  | 14,465,491 |
Tenant origination and absorption costs |  | 1,536,998 |
Accumulated Depreciation and Amortization |  | (2,151,938) |
Total Investment in Real Estate Property, Net |  | 13,850,551 |
Office | Texas Health |  |  |
Real Estate [Line Items] |  |  |
Land, Buildings and Improvements | 6,976,703 | 6,976,703 |
Tenant origination and absorption costs | 713,221 | 713,221 |
Accumulated Depreciation and Amortization | (829,997) | (681,341) |
Total Investment in Real Estate Property, Net | 6,859,927 | 7,008,583 |
Office | Bon Secours |  |  |
Real Estate [Line Items] |  |  |
Land, Buildings and Improvements | 10,388,751 | 10,388,751 |
Tenant origination and absorption costs | 800,356 | 800,356 |
Accumulated Depreciation and Amortization | (1,204,744) | (978,335) |
Total Investment in Real Estate Property, Net | 9,984,363 | 10,210,772 |
Office | Costco |  |  |
Real Estate [Line Items] |  |  |
Land, Buildings and Improvements | 27,330,797 | 27,330,797 |
Tenant origination and absorption costs | 2,765,136 | 2,765,136 |
Accumulated Depreciation and Amortization | (3,305,667) | (2,654,329) |
Total Investment in Real Estate Property, Net | 26,790,266 | 27,441,604 |
Office | GSA (MSHA) |  |  |
Real Estate [Line Items] |  |  |
Land, Buildings and Improvements | 3,112,076 | 3,112,076 |
Tenant origination and absorption costs | 243,307 | 243,307 |
Accumulated Depreciation and Amortization | (207,772) | (138,515) |
Total Investment in Real Estate Property, Net | 3,147,611 | 3,216,868 |
Office | Solar Turbines |  |  |
Real Estate [Line Items] |  |  |
Land, Buildings and Improvements | 7,133,241 | 7,133,241 |
Tenant origination and absorption costs | 284,026 | 284,026 |
Accumulated Depreciation and Amortization | (507,486) | (338,232) |
Total Investment in Real Estate Property, Net | 6,909,781 | 7,079,035 |
Office | Gap |  |  |
Real Estate [Line Items] |  |  |
Land, Buildings and Improvements | 8,378,276 | 8,378,276 |
Tenant origination and absorption costs | 360,377 | 360,377 |
Accumulated Depreciation and Amortization | (718,960) | (479,306) |
Total Investment in Real Estate Property, Net | 8,019,693 | 8,259,347 |
Office | Sutter Health |  |  |
Real Estate [Line Items] |  |  |
Land, Buildings and Improvements | 29,555,055 | 29,555,055 |
Tenant origination and absorption costs | 1,616,610 | 1,616,610 |
Accumulated Depreciation and Amortization | (1,620,523) | (1,080,349) |
Total Investment in Real Estate Property, Net | 29,551,142 | 30,091,316 |
Retail | Dollar General, Litchfield |  |  |
Real Estate [Line Items] |  |  |
Land, Buildings and Improvements |  | 1,281,812 |
Tenant origination and absorption costs |  | 116,302 |
Accumulated Depreciation and Amortization |  | (166,006) |
Total Investment in Real Estate Property, Net |  | 1,232,108 |
Retail | Dollar General, Wilton |  |  |
Real Estate [Line Items] |  |  |
Land, Buildings and Improvements |  | 1,543,776 |
Tenant origination and absorption costs |  | 140,653 |
Accumulated Depreciation and Amortization |  | (212,451) |
Total Investment in Real Estate Property, Net |  | 1,471,978 |
Retail | Dollar General, Thompsontown |  |  |
Real Estate [Line Items] |  |  |
Land, Buildings and Improvements |  | 1,199,860 |
Tenant origination and absorption costs |  | 106,730 |
Accumulated Depreciation and Amortization |  | (159,501) |
Total Investment in Real Estate Property, Net |  | 1,147,089 |
Retail | Dollar General, Mt. Gilead |  |  |
Real Estate [Line Items] |  |  |
Land, Buildings and Improvements |  | 1,174,188 |
Tenant origination and absorption costs |  | 111,847 |
Accumulated Depreciation and Amortization |  | (152,925) |
Total Investment in Real Estate Property, Net |  | 1,133,110 |
Retail | Dollar General, Lakeside |  |  |
Real Estate [Line Items] |  |  |
Land, Buildings and Improvements |  | 1,112,872 |
Tenant origination and absorption costs |  | 100,857 |
Accumulated Depreciation and Amortization |  | (156,949) |
Total Investment in Real Estate Property, Net |  | 1,056,780 |
Retail | Dollar General, Castalia |  |  |
Real Estate [Line Items] |  |  |
Land, Buildings and Improvements |  | 1,102,086 |
Tenant origination and absorption costs |  | 86,408 |
Accumulated Depreciation and Amortization |  | (152,492) |
Total Investment in Real Estate Property, Net |  | 1,036,002 |
Retail | Dollar General, Bakersfield |  |  |
Real Estate [Line Items] |  |  |
Land, Buildings and Improvements |  | 4,899,714 |
Tenant origination and absorption costs |  | 261,630 |
Accumulated Depreciation and Amortization |  | (147,132) |
Total Investment in Real Estate Property, Net |  | 5,014,212 |
Retail | PreK Education |  |  |
Real Estate [Line Items] |  |  |
Land, Buildings and Improvements |  | 12,447,287 |
Tenant origination and absorption costs |  | 447,927 |
Accumulated Depreciation and Amortization |  | (599,428) |
Total Investment in Real Estate Property, Net |  | 12,295,786 |
Retail | Dollar Tree |  |  |
Real Estate [Line Items] |  |  |
Land, Buildings and Improvements | 1,320,367 | 1,320,367 |
Tenant origination and absorption costs | 73,298 | 73,298 |
Accumulated Depreciation and Amortization | (106,366) | (70,911) |
Total Investment in Real Estate Property, Net | 1,287,299 | 1,322,754 |
Retail | Dollar General, Big Spring |  |  |
Real Estate [Line Items] |  |  |
Land, Buildings and Improvements | 1,281,683 | 1,281,683 |
Tenant origination and absorption costs | 76,351 | 76,351 |
Accumulated Depreciation and Amortization | (76,453) | (50,969) |
Total Investment in Real Estate Property, Net | 1,281,581 | 1,307,065 |
Retail | Walgreens, Santa Maria |  |  |
Real Estate [Line Items] |  |  |
Land, Buildings and Improvements |  | 5,223,442 |
Tenant origination and absorption costs |  | 335,945 |
Accumulated Depreciation and Amortization |  | (132,961) |
Total Investment in Real Estate Property, Net |  | 5,426,426 |
Industrial | Dana |  |  |
Real Estate [Line Items] |  |  |
Land, Buildings and Improvements |  | 6,802,876 |
Tenant origination and absorption costs |  | 531,439 |
Accumulated Depreciation and Amortization |  | (1,835,800) |
Total Investment in Real Estate Property, Net |  | 5,498,515 |
Industrial | Omnicare |  |  |
Real Estate [Line Items] |  |  |
Land, Buildings and Improvements | 7,262,747 | 7,262,747 |
Tenant origination and absorption costs | 281,442 | 281,442 |
Accumulated Depreciation and Amortization | (954,774) | (832,474) |
Total Investment in Real Estate Property, Net | 6,589,415 | 6,711,715 |
Industrial | Husqvarna |  |  |
Real Estate [Line Items] |  |  |
Land, Buildings and Improvements | 11,840,200 | 11,840,200 |
Tenant origination and absorption costs | 1,013,948 | 1,013,948 |
Accumulated Depreciation and Amortization | (1,292,198) | (1,113,651) |
Total Investment in Real Estate Property, Net | 11,561,950 | 11,740,497 |
Industrial | AvAir |  |  |
Real Estate [Line Items] |  |  |
Land, Buildings and Improvements | 27,357,899 | 27,357,900 |
Tenant origination and absorption costs | 0 | 0 |
Accumulated Depreciation and Amortization | (2,458,171) | (2,111,134) |
Total Investment in Real Estate Property, Net | 24,899,728 | 25,246,766 |
Industrial | 3M |  |  |
Real Estate [Line Items] |  |  |
Land, Buildings and Improvements |  | 14,762,819 |
Tenant origination and absorption costs |  | 2,356,361 |
Accumulated Depreciation and Amortization |  | (3,476,588) |
Total Investment in Real Estate Property, Net |  | 13,642,592 |
Industrial | Taylor Fresh Foods |  |  |
Real Estate [Line Items] |  |  |
Land, Buildings and Improvements | 34,194,369 | 34,194,369 |
Tenant origination and absorption costs | 2,894,017 | 2,894,017 |
Accumulated Depreciation and Amortization | (2,257,859) | (1,597,022) |
Total Investment in Real Estate Property, Net | 34,830,527 | 35,491,364 |
Industrial | Levins |  |  |
Real Estate [Line Items] |  |  |
Land, Buildings and Improvements | 4,429,390 | 4,429,390 |
Tenant origination and absorption costs | 221,927 | 221,927 |
Accumulated Depreciation and Amortization | (330,913) | (220,609) |
Total Investment in Real Estate Property, Net | 4,320,404 | 4,430,708 |
Industrial | PMI Preclinical |  |  |
Real Estate [Line Items] |  |  |
Land, Buildings and Improvements |  | 9,672,174 |
Tenant origination and absorption costs |  | 408,225 |
Accumulated Depreciation and Amortization |  | (204,321) |
Total Investment in Real Estate Property, Net |  | 9,876,078 |
Industrial | Wood Group |  |  |
Real Estate [Line Items] |  |  |
Land, Buildings and Improvements | 9,731,220 | 9,731,220 |
Tenant origination and absorption costs | 539,633 | 466,293 |
Accumulated Depreciation and Amortization | (742,040) | (565,017) |
Total Investment in Real Estate Property, Net | 9,528,813 | 9,632,496 |
Industrial | ITW Rippey |  |  |
Real Estate [Line Items] |  |  |
Land, Buildings and Improvements | 7,071,143 | 7,071,143 |
Tenant origination and absorption costs | 304,387 | 304,387 |
Accumulated Depreciation and Amortization | (456,010) | (303,219) |
Total Investment in Real Estate Property, Net | $ 6,919,520 | 7,072,311 |
Industrial | L-3 Communications |  |  |
Real Estate [Line Items] |  |  |
Land, Buildings and Improvements |  | 11,631,857 |
Tenant origination and absorption costs |  | 454,035 |
Accumulated Depreciation and Amortization |  | (470,823) |
Total Investment in Real Estate Property, Net |  | 11,615,069 |
Land | Northrop Grumman Parcel |  |  |
Real Estate [Line Items] |  |  |
Land, Buildings and Improvements |  | 329,410 |
Tenant origination and absorption costs |  | 0 |
Accumulated Depreciation and Amortization |  | 0 |
Total Investment in Real Estate Property, Net |  | $ 329,410 |

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