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Schedule III Real Estate Assets and Accumulated Depreciation and Amortization - Schedule of Properties (FY) (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Real Estate [Line Items] |  |  |
Encumbrances | $ 176,948,438 |  |
Land | 65,681,176 |  |
Buildings & Improvements | 289,524,113 |  |
Total | 355,205,289 |  |
Costs Capitalized Subsequent to Acquisition | 6,665,416 |  |
Land | 65,358,321 |  |
Buildings & Improvements | 296,189,529 |  |
Total | 361,547,850 | $ 423,947,488 | $ 235,212,009
Accumulated Depreciation and Amortization | (32,091,211) | $ (20,411,794) | $ (10,563,664)
Net | 329,456,639 |  |
Accredo Health |  |  |
Real Estate [Line Items] |  |  |
Encumbrances | 8,538,000 |  |
Land | 1,706,641 |  |
Buildings & Improvements | 9,003,859 |  |
Total | 10,710,500 |  |
Costs Capitalized Subsequent to Acquisition | 414,698 |  |
Land | 1,706,641 |  |
Buildings & Improvements | 9,418,557 |  |
Total | 11,125,198 |  |
Accumulated Depreciation and Amortization | (2,221,380) |  |
Net | 8,903,818 |  |
Dollar General |  |  |
Real Estate [Line Items] |  |  |
Encumbrances | 622,884 |  |
Land | 293,912 |  |
Buildings & Improvements | 1,104,202 |  |
Total | 1,398,114 |  |
Costs Capitalized Subsequent to Acquisition | 0 |  |
Land | 293,912 |  |
Buildings & Improvements | 1,104,202 |  |
Total | 1,398,114 |  |
Accumulated Depreciation and Amortization | (166,006) |  |
Net | 1,232,108 |  |
Dollar General |  |  |
Real Estate [Line Items] |  |  |
Encumbrances | 627,992 |  |
Land | 212,036 |  |
Buildings & Improvements | 1,472,393 |  |
Total | 1,684,429 |  |
Costs Capitalized Subsequent to Acquisition | 0 |  |
Land | 212,036 |  |
Buildings & Improvements | 1,472,393 |  |
Total | 1,684,429 |  |
Accumulated Depreciation and Amortization | (212,451) |  |
Net | 1,471,978 |  |
Dollar General |  |  |
Real Estate [Line Items] |  |  |
Encumbrances | 627,992 |  |
Land | 217,912 |  |
Buildings & Improvements | 1,088,678 |  |
Total | 1,306,590 |  |
Costs Capitalized Subsequent to Acquisition | 0 |  |
Land | 217,912 |  |
Buildings & Improvements | 1,088,678 |  |
Total | 1,306,590 |  |
Accumulated Depreciation and Amortization | (159,501) |  |
Net | 1,147,089 |  |
Dollar General |  |  |
Real Estate [Line Items] |  |  |
Encumbrances | 622,884 |  |
Land | 283,578 |  |
Buildings & Improvements | 1,002,457 |  |
Total | 1,286,035 |  |
Costs Capitalized Subsequent to Acquisition | 0 |  |
Land | 283,578 |  |
Buildings & Improvements | 1,002,457 |  |
Total | 1,286,035 |  |
Accumulated Depreciation and Amortization | (152,925) |  |
Net | 1,133,110 |  |
Dollar General |  |  |
Real Estate [Line Items] |  |  |
Encumbrances | 622,884 |  |
Land | 176,515 |  |
Buildings & Improvements | 1,037,214 |  |
Total | 1,213,729 |  |
Costs Capitalized Subsequent to Acquisition | 0 |  |
Land | 176,515 |  |
Buildings & Improvements | 1,037,214 |  |
Total | 1,213,729 |  |
Accumulated Depreciation and Amortization | (156,949) |  |
Net | 1,056,780 |  |
Dollar General |  |  |
Real Estate [Line Items] |  |  |
Encumbrances | 622,884 |  |
Land | 154,676 |  |
Buildings & Improvements | 1,033,818 |  |
Total | 1,188,494 |  |
Costs Capitalized Subsequent to Acquisition | 0 |  |
Land | 154,676 |  |
Buildings & Improvements | 1,033,818 |  |
Total | 1,188,494 |  |
Accumulated Depreciation and Amortization | (152,492) |  |
Net | 1,036,002 |  |
Dana |  |  |
Real Estate [Line Items] |  |  |
Encumbrances | 4,466,865 |  |
Land | 1,290,863 |  |
Buildings & Improvements | 8,312,917 |  |
Total | 9,603,780 |  |
Costs Capitalized Subsequent to Acquisition | (1,946,609) |  |
Land | 968,007 |  |
Buildings & Improvements | 6,366,308 |  |
Total | 7,334,315 |  |
Accumulated Depreciation and Amortization | (1,835,800) |  |
Net | 5,498,515 |  |
Northrop Grumman | Office |  |  |
Real Estate [Line Items] |  |  |
Encumbrances | 5,518,589 |  |
Land | 1,191,024 |  |
Buildings & Improvements | 12,533,166 |  |
Total | 13,724,190 |  |
Costs Capitalized Subsequent to Acquisition | 0 |  |
Land | 1,191,024 |  |
Buildings & Improvements | 12,533,166 |  |
Total | 13,724,190 |  |
Accumulated Depreciation and Amortization | (2,968,985) |  |
Net | 10,755,205 |  |
exp US Services |  |  |
Real Estate [Line Items] |  |  |
Encumbrances | 3,321,931 |  |
Land | 785,801 |  |
Buildings & Improvements | 5,522,567 |  |
Total | 6,308,368 |  |
Costs Capitalized Subsequent to Acquisition | 136,548 |  |
Land | 785,801 |  |
Buildings & Improvements | 5,659,115 |  |
Total | 6,444,916 |  |
Accumulated Depreciation and Amortization | (833,278) |  |
Net | 5,611,638 |  |
Wyndham |  |  |
Real Estate [Line Items] |  |  |
Encumbrances | 5,607,000 |  |
Land | 4,144,069 |  |
Buildings & Improvements | 5,972,433 |  |
Total | 10,116,502 |  |
Costs Capitalized Subsequent to Acquisition | 959,213 |  |
Land | 4,144,069 |  |
Buildings & Improvements | 6,931,646 |  |
Total | 11,075,715 |  |
Accumulated Depreciation and Amortization | (1,170,222) |  |
Net | 9,905,493 |  |
Williams-Sonoma |  |  |
Real Estate [Line Items] |  |  |
Encumbrances | 4,438,200 |  |
Land | 3,546,744 |  |
Buildings & Improvements | 4,028,821 |  |
Total | 7,575,565 |  |
Costs Capitalized Subsequent to Acquisition | 1,054,532 |  |
Land | 3,546,745 |  |
Buildings & Improvements | 5,083,353 |  |
Total | 8,630,098 |  |
Accumulated Depreciation and Amortization | (1,058,455) |  |
Net | 7,571,643 |  |
Omnicare |  |  |
Real Estate [Line Items] |  |  |
Encumbrances | 4,193,171 |  |
Land | 800,772 |  |
Buildings & Improvements | 6,523,599 |  |
Total | 7,324,371 |  |
Costs Capitalized Subsequent to Acquisition | 219,818 |  |
Land | 800,772 |  |
Buildings & Improvements | 6,743,417 |  |
Total | 7,544,189 |  |
Accumulated Depreciation and Amortization | (832,474) |  |
Net | 6,711,715 |  |
EMCOR |  |  |
Real Estate [Line Items] |  |  |
Encumbrances | 2,811,539 |  |
Land | 427,589 |  |
Buildings & Improvements | 5,996,509 |  |
Total | 6,424,098 |  |
Costs Capitalized Subsequent to Acquisition | 0 |  |
Land | 427,589 |  |
Buildings & Improvements | 5,996,509 |  |
Total | 6,424,098 |  |
Accumulated Depreciation and Amortization | (604,163) |  |
Net | 5,819,935 |  |
Husqvarna |  |  |
Real Estate [Line Items] |  |  |
Encumbrances | 6,379,182 |  |
Land | 974,663 |  |
Buildings & Improvements | 11,879,485 |  |
Total | 12,854,148 |  |
Costs Capitalized Subsequent to Acquisition | 0 |  |
Land | 974,663 |  |
Buildings & Improvements | 11,879,485 |  |
Total | 12,854,148 |  |
Accumulated Depreciation and Amortization | (1,113,651) |  |
Net | 11,740,497 |  |
AvAir |  |  |
Real Estate [Line Items] |  |  |
Encumbrances | 19,950,000 |  |
Land | 3,493,673 |  |
Buildings & Improvements | 23,864,227 |  |
Total | 27,357,900 |  |
Costs Capitalized Subsequent to Acquisition | 0 |  |
Land | 3,493,673 |  |
Buildings & Improvements | 23,864,227 |  |
Total | 27,357,900 |  |
Accumulated Depreciation and Amortization | (2,111,134) |  |
Net | 25,246,766 |  |
3M |  |  |
Real Estate [Line Items] |  |  |
Encumbrances | 8,166,000 |  |
Land | 758,780 |  |
Buildings & Improvements | 16,360,400 |  |
Total | 17,119,180 |  |
Costs Capitalized Subsequent to Acquisition | 0 |  |
Land | 758,780 |  |
Buildings & Improvements | 16,360,400 |  |
Total | 17,119,180 |  |
Accumulated Depreciation and Amortization | (3,476,588) |  |
Net | 13,642,592 |  |
Cummins |  |  |
Real Estate [Line Items] |  |  |
Encumbrances | 8,332,200 |  |
Land | 3,347,960 |  |
Buildings & Improvements | 12,654,529 |  |
Total | 16,002,489 |  |
Costs Capitalized Subsequent to Acquisition | 0 |  |
Land | 3,347,960 |  |
Buildings & Improvements | 12,654,529 |  |
Total | 16,002,489 |  |
Accumulated Depreciation and Amortization | (2,151,938) |  |
Net | 13,850,551 |  |
Northrop Grumman Parcel | Land |  |  |
Real Estate [Line Items] |  |  |
Encumbrances | 0 |  |
Land | 329,410 |  |
Buildings & Improvements | 0 |  |
Total | 329,410 |  |
Costs Capitalized Subsequent to Acquisition | 0 |  |
Land | 329,410 |  |
Buildings & Improvements | 0 |  |
Total | 329,410 |  |
Accumulated Depreciation and Amortization | 0 |  |
Net | 329,410 |  |
Texas Health |  |  |
Real Estate [Line Items] |  |  |
Encumbrances | 4,363,203 |  |
Land | 1,827,914 |  |
Buildings & Improvements | 5,862,010 |  |
Total | 7,689,924 |  |
Costs Capitalized Subsequent to Acquisition | 0 |  |
Land | 1,827,914 |  |
Buildings & Improvements | 5,862,010 |  |
Total | 7,689,924 |  |
Accumulated Depreciation and Amortization | (681,341) |  |
Net | 7,008,583 |  |
Bon Secours |  |  |
Real Estate [Line Items] |  |  |
Encumbrances | 5,180,552 |  |
Land | 1,658,659 |  |
Buildings & Improvements | 9,184,248 |  |
Total | 10,842,907 |  |
Costs Capitalized Subsequent to Acquisition | 346,200 |  |
Land | 1,658,659 |  |
Buildings & Improvements | 9,530,448 |  |
Total | 11,189,107 |  |
Accumulated Depreciation and Amortization | (978,335) |  |
Net | 10,210,772 |  |
Costco |  |  |
Real Estate [Line Items] |  |  |
Encumbrances | 18,850,000 |  |
Land | 8,202,915 |  |
Buildings & Improvements | 21,825,853 |  |
Total | 30,028,768 |  |
Costs Capitalized Subsequent to Acquisition | 67,165 |  |
Land | 8,202,915 |  |
Buildings & Improvements | 21,893,018 |  |
Total | 30,095,933 |  |
Accumulated Depreciation and Amortization | (2,654,329) |  |
Net | 27,441,604 |  |
Taylor Fresh Foods |  |  |
Real Estate [Line Items] |  |  |
Encumbrances | 12,350,000 |  |
Land | 4,312,016 |  |
Buildings & Improvements | 32,776,370 |  |
Total | 37,088,386 |  |
Costs Capitalized Subsequent to Acquisition | 0 |  |
Land | 4,312,016 |  |
Buildings & Improvements | 32,776,370 |  |
Total | 37,088,386 |  |
Accumulated Depreciation and Amortization | (1,597,022) |  |
Net | 35,491,364 |  |
Levins |  |  |
Real Estate [Line Items] |  |  |
Encumbrances | 2,032,332 |  |
Land | 1,404,863 |  |
Buildings & Improvements | 3,204,715 |  |
Total | 4,609,578 |  |
Costs Capitalized Subsequent to Acquisition | 41,739 |  |
Land | 1,404,863 |  |
Buildings & Improvements | 3,246,454 |  |
Total | 4,651,317 |  |
Accumulated Depreciation and Amortization | (220,609) |  |
Net | 4,430,708 |  |
Dollar General |  |  |
Real Estate [Line Items] |  |  |
Encumbrances | 2,268,922 |  |
Land | 1,099,458 |  |
Buildings & Improvements | 3,824,688 |  |
Total | 4,924,146 |  |
Costs Capitalized Subsequent to Acquisition | 237,198 |  |
Land | 1,099,458 |  |
Buildings & Improvements | 4,061,886 |  |
Total | 5,161,344 |  |
Accumulated Depreciation and Amortization | (147,132) |  |
Net | 5,014,212 |  |
PMI Preclinical |  |  |
Real Estate [Line Items] |  |  |
Encumbrances | 4,020,418 |  |
Land | 4,774,497 |  |
Buildings & Improvements | 5,243,803 |  |
Total | 10,018,300 |  |
Costs Capitalized Subsequent to Acquisition | 62,099 |  |
Land | 4,774,497 |  |
Buildings & Improvements | 5,305,902 |  |
Total | 10,080,399 |  |
Accumulated Depreciation and Amortization | (204,321) |  |
Net | 9,876,078 |  |
GSA (MSHA) |  |  |
Real Estate [Line Items] |  |  |
Encumbrances | 1,752,092 |  |
Land | 399,062 |  |
Buildings & Improvements | 2,869,790 |  |
Total | 3,268,852 |  |
Costs Capitalized Subsequent to Acquisition | 86,531 |  |
Land | 399,062 |  |
Buildings & Improvements | 2,956,321 |  |
Total | 3,355,383 |  |
Accumulated Depreciation and Amortization | (138,515) |  |
Net | 3,216,868 |  |
PreK Education |  |  |
Real Estate [Line Items] |  |  |
Encumbrances | 5,037,846 |  |
Land | 963,044 |  |
Buildings & Improvements | 11,411,964 |  |
Total | 12,375,008 |  |
Costs Capitalized Subsequent to Acquisition | 520,206 |  |
Land | 963,044 |  |
Buildings & Improvements | 11,932,170 |  |
Total | 12,895,214 |  |
Accumulated Depreciation and Amortization | (599,428) |  |
Net | 12,295,786 |  |
Dollar Tree |  |  |
Real Estate [Line Items] |  |  |
Encumbrances | 0 |  |
Land | 159,829 |  |
Buildings & Improvements | 1,020,053 |  |
Total | 1,179,882 |  |
Costs Capitalized Subsequent to Acquisition | 213,783 |  |
Land | 159,829 |  |
Buildings & Improvements | 1,233,836 |  |
Total | 1,393,665 |  |
Accumulated Depreciation and Amortization | (70,911) |  |
Net | 1,322,754 |  |
Solar Turbines |  |  |
Real Estate [Line Items] |  |  |
Encumbrances | 2,777,552 |  |
Land | 2,483,960 |  |
Buildings & Improvements | 4,722,578 |  |
Total | 7,206,538 |  |
Costs Capitalized Subsequent to Acquisition | 210,729 |  |
Land | 2,483,960 |  |
Buildings & Improvements | 4,933,307 |  |
Total | 7,417,267 |  |
Accumulated Depreciation and Amortization | (338,232) |  |
Net | 7,079,035 |  |
Wood Group |  |  |
Real Estate [Line Items] |  |  |
Encumbrances | 3,397,371 |  |
Land | 3,461,256 |  |
Buildings & Improvements | 6,662,918 |  |
Total | 10,124,174 |  |
Costs Capitalized Subsequent to Acquisition | 73,339 |  |
Land | 3,461,256 |  |
Buildings & Improvements | 6,736,257 |  |
Total | 10,197,513 |  |
Accumulated Depreciation and Amortization | (565,017) |  |
Net | 9,632,496 |  |
ITW Rippey |  |  |
Real Estate [Line Items] |  |  |
Encumbrances | 3,039,777 |  |
Land | 787,945 |  |
Buildings & Improvements | 6,392,126 |  |
Total | 7,180,071 |  |
Costs Capitalized Subsequent to Acquisition | 195,459 |  |
Land | 787,945 |  |
Buildings & Improvements | 6,587,585 |  |
Total | 7,375,530 |  |
Accumulated Depreciation and Amortization | (303,219) |  |
Net | 7,072,311 |  |
Dollar General, Bakersfield |  |  |
Real Estate [Line Items] |  |  |
Encumbrances | 599,756 |  |
Land | 103,838 |  |
Buildings & Improvements | 1,114,728 |  |
Total | 1,218,566 |  |
Costs Capitalized Subsequent to Acquisition | 139,468 |  |
Land | 103,838 |  |
Buildings & Improvements | 1,254,196 |  |
Total | 1,358,034 |  |
Accumulated Depreciation and Amortization | (50,969) |  |
Net | 1,307,065 |  |
Gap |  |  |
Real Estate [Line Items] |  |  |
Encumbrances | 3,569,990 |  |
Land | 2,076,754 |  |
Buildings & Improvements | 5,715,144 |  |
Total | 7,791,898 |  |
Costs Capitalized Subsequent to Acquisition | 946,755 |  |
Land | 2,076,754 |  |
Buildings & Improvements | 6,661,899 |  |
Total | 8,738,653 |  |
Accumulated Depreciation and Amortization | (479,306) |  |
Net | 8,259,347 |  |
L-3 Communications |  |  |
Real Estate [Line Items] |  |  |
Encumbrances | 5,185,929 |  |
Land | 3,552,878 |  |
Buildings & Improvements | 8,099,339 |  |
Total | 11,652,217 |  |
Costs Capitalized Subsequent to Acquisition | 433,675 |  |
Land | 3,552,878 |  |
Buildings & Improvements | 8,533,014 |  |
Total | 12,085,892 |  |
Accumulated Depreciation and Amortization | (470,823) |  |
Net | 11,615,069 |  |
Sutter Health |  |  |
Real Estate [Line Items] |  |  |
Encumbrances | 13,879,655 |  |
Land | 2,443,240 |  |
Buildings & Improvements | 26,690,356 |  |
Total | 29,133,596 |  |
Costs Capitalized Subsequent to Acquisition | 2,038,069 |  |
Land | 2,443,240 |  |
Buildings & Improvements | 28,728,425 |  |
Total | 31,171,665 |  |
Accumulated Depreciation and Amortization | (1,080,349) |  |
Net | 30,091,316 |  |
Walgreens |  |  |
Real Estate [Line Items] |  |  |
Encumbrances | 3,172,846 |  |
Land | 1,832,430 |  |
Buildings & Improvements | 3,512,156 |  |
Total | 5,344,586 |  |
Costs Capitalized Subsequent to Acquisition | 214,801 |  |
Land | 1,832,430 |  |
Buildings & Improvements | 3,726,957 |  |
Total | 5,559,387 |  |
Accumulated Depreciation and Amortization | (132,961) |  |
Net | $ 5,426,426 |  |

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