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DEBT - Summary of Company's Mortgage Notes (FY) (Details) |  |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 05, 2021 USD ($) | Apr. 01, 2020 USD ($) | Feb. 04, 2020 USD ($) | Jan. 31, 2020 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) monthlyPayment | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Aug. 10, 2020 USD ($) | Jul. 29, 2020 USD ($) | Jul. 22, 2020 USD ($)
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  | $ 185,758,762 | $ 182,948,438 |  |  | $ 185,758,762 |  | $ 182,948,438 |  |  |  |
Plus: unamortized mortgage premium, net of discount |  |  |  |  | 390,426 | 447,471 |  |  | 390,426 |  | 447,471 |  |  |  |
Less: unamortized deferred financing costs |  |  |  |  | (1,683,279) | (1,491,715) |  |  | (1,683,279) |  | (1,491,715) |  |  |  |
Net principal |  |  |  |  | 184,465,909 | 181,904,194 |  |  | $ 184,465,909 |  | $ 181,904,194 |  |  |  |
Loans to assets ratio (as a percent) |  |  |  |  |  |  |  |  | 60.00% |  | 60.00% |  |  |  |
Impairment of real estate investment properties |  |  |  |  | (400,999) | 761,100 | $ 349,457 | $ 9,157,068 | $ (400,999) | $ 9,506,525 | $ 10,267,625 | $ 0 |  |  |
Six Dollar General properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  | $ 3,711,118 | 3,747,520 |  |  | $ 3,711,118 |  | 3,747,520 |  |  |  |
Contractual interest rate |  |  |  |  | 4.69% |  |  |  | 4.69% |  |  |  |  |  |
Effective interest rate |  |  |  |  | 4.69% |  |  |  | 4.69% |  |  |  |  |  |
Dana |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  | $ 0 | 4,466,865 |  |  | $ 0 |  | 4,466,865 |  |  |  |
Contractual interest rate |  |  |  |  | 4.56% |  |  |  | 4.56% |  |  |  |  |  |
Effective interest rate |  |  |  |  | 4.56% |  |  |  | 4.56% |  |  |  |  |  |
Northrop Grumman |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  | $ 7,000,000 | 5,518,589 |  |  | $ 7,000,000 |  | 5,518,589 |  |  |  |
Contractual interest rate |  |  |  |  | 3.35% |  |  |  | 3.35% |  |  |  |  |  |
Effective interest rate |  |  |  |  | 3.35% |  |  |  | 3.35% |  |  |  |  |  |
exp US Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  | $ 3,288,786 | $ 3,321,931 |  |  | $ 3,288,786 |  | $ 3,321,931 |  |  |  |
Effective interest rate |  |  |  |  | 4.25% |  |  |  | 4.25% |  |  |  |  |  |
exp US Services | Initial Contractual Interest One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial contractual interest rate |  |  |  |  | 4.25% | 4.25% |  |  | 4.25% |  | 4.25% |  |  |  |
exp US Services | Treasury Bill Index |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual interest rate |  |  |  |  | 3.25% | 3.25% |  |  | 3.25% |  | 3.25% |  |  |  |
Harley Davidson property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  | $ 6,558,170 | $ 0 |  |  | $ 6,558,170 |  | $ 0 |  |  |  |
Contractual interest rate |  |  |  |  | 425.00% |  |  |  | 425.00% |  |  |  |  |  |
Effective interest rate |  |  |  |  | 4.25% |  |  |  | 4.25% |  |  |  |  |  |
Wyndham |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  | $ 5,551,200 | 5,607,000 |  |  | $ 5,551,200 |  | 5,607,000 |  |  |  |
Effective interest rate |  |  |  |  | 4.34% |  |  |  | 4.34% |  |  |  |  |  |
Wyndham | (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate ( as a percent) |  |  |  |  |  |  |  |  | 2.05% |  |  |  |  |  |
Williams Sonoma |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  | $ 4,392,000 | 4,438,200 |  |  | $ 4,392,000 |  | 4,438,200 |  |  |  |
Effective interest rate |  |  |  |  | 4.34% |  |  |  | 4.34% |  |  |  |  |  |
Williams Sonoma | (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate ( as a percent) |  |  |  |  |  |  |  |  | 2.05% |  |  |  |  |  |
Omnicare |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  | $ 4,151,386 | 4,193,171 |  |  | $ 4,151,386 |  | 4,193,171 |  |  |  |
Contractual interest rate |  |  |  |  | 4.36% |  |  |  | 4.36% |  |  |  |  |  |
Effective interest rate |  |  |  |  | 4.36% |  |  |  | 4.36% |  |  |  |  |  |
EMCOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  | $ 2,784,868 | 2,811,539 |  |  | $ 2,784,868 |  | 2,811,539 |  |  |  |
Contractual interest rate |  |  |  |  | 4.35% |  |  |  | 4.35% |  |  |  |  |  |
Effective interest rate |  |  |  |  | 4.35% |  |  |  | 4.35% |  |  |  |  |  |
Husqvarna |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  | $ 6,379,182 | $ 6,379,182 |  |  | $ 6,379,182 |  | $ 6,379,182 |  |  |  |
Contractual interest rate |  |  |  |  | 4.60% | 4.60% |  |  | 4.60% |  | 4.60% |  |  |  |
Effective interest rate |  |  |  |  | 4.60% |  |  |  | 4.60% |  |  |  |  |  |
Husqvarna | Treasury Bill Index |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate ( as a percent) |  |  |  |  |  |  |  |  | 2.45% |  |  |  |  |  |
Husqvarna | Maximum | Treasury Bill Index |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual interest rate |  |  |  |  |  | 2.45% |  |  |  |  | 2.45% |  |  |  |
AvAir |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  | $ 19,950,000 | $ 19,950,000 |  |  | $ 19,950,000 |  | $ 19,950,000 |  |  |  |
Contractual interest rate |  |  |  |  | 3.80% |  |  |  | 3.80% |  |  |  |  |  |
Effective interest rate |  |  |  |  | 3.80% |  |  |  | 3.80% |  |  |  |  |  |
3M |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  | $ 8,091,800 | 8,166,000 |  |  | $ 8,091,800 |  | 8,166,000 |  |  |  |
Effective interest rate |  |  |  |  | 5.09% |  |  |  | 5.09% |  |  |  |  |  |
3M | (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate ( as a percent) |  |  |  |  |  |  |  |  | 2.25% |  |  |  |  |  |
Former 24 Hour Fitness |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of real estate investment properties |  |  |  |  |  |  |  | $ 5,664,517 |  |  |  |  |  |  |
Texas Health |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  | $ 4,324,160 | 4,363,203 |  |  | $ 4,324,160 |  | 4,363,203 |  |  |  |
Contractual interest rate |  |  |  |  | 4.00% |  |  |  | 4.00% |  |  |  |  |  |
Effective interest rate |  |  |  |  | 4.00% |  |  |  | 4.00% |  |  |  |  |  |
Bon Secours |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  | $ 5,142,425 | 5,180,552 |  |  | $ 5,142,425 |  | 5,180,552 |  |  |  |
Contractual interest rate |  |  |  |  | 5.41% |  |  |  | 5.41% |  |  |  |  |  |
Effective interest rate |  |  |  |  | 5.41% |  |  |  | 5.41% |  |  |  |  |  |
Costco |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  | $ 18,850,000 | 18,850,000 |  |  | $ 18,850,000 |  | 18,850,000 |  |  |  |
Contractual interest rate |  |  |  |  | 4.85% |  |  |  | 4.85% |  |  |  |  |  |
Effective interest rate |  |  |  |  | 4.85% |  |  |  | 4.85% |  |  |  |  |  |
Taylor Fresh Foods property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  | $ 12,350,000 | 12,350,000 |  |  | $ 12,350,000 |  | 12,350,000 |  |  |  |
Contractual interest rate |  |  |  |  | 3.85% |  |  |  | 3.85% |  |  |  |  |  |
Effective interest rate |  |  |  |  | 3.85% |  |  |  | 3.85% |  |  |  |  |  |
Levins |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  | $ 2,687,293 | 2,032,332 |  |  | $ 2,687,293 |  | 2,032,332 |  |  |  |
Contractual interest rate |  |  |  |  | 3.75% |  |  |  | 3.75% |  |  |  |  |  |
Effective interest rate |  |  |  |  | 3.75% |  |  |  | 3.75% |  |  |  |  |  |
GSA (MSHA) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  | $ 1,743,349 | 1,752,092 |  |  | $ 1,743,349 |  | 1,752,092 |  |  |  |
Contractual interest rate |  |  |  |  | 3.65% |  |  |  | 3.65% |  |  |  |  |  |
Effective interest rate |  |  |  |  | 3.65% |  |  |  | 3.65% |  |  |  |  |  |
GSA (MSHA) | Swap | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, cost of hedge net of cash received | $ 9,900 |  |  |  |  |  |  |  |  |  |  |  |  |  |
PreK San Antonio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  | $ 4,984,311 | 5,037,846 |  |  | $ 4,984,311 |  | 5,037,846 |  |  |  |
Contractual interest rate |  |  |  |  | 4.25% |  |  |  | 4.25% |  |  |  |  |  |
Effective interest rate |  |  |  |  | 4.25% |  |  |  | 4.25% |  |  |  |  |  |
Dinan Cars |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from lease payments |  |  |  | $ 783,182 |  |  |  |  |  |  |  |  |  |  |
Dinan Cars | Swap |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, cost of hedge net of cash received |  |  | $ 47,000 |  |  |  |  |  |  |  |  |  |  |  |
Dollar General, Big Spring |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  | $ 593,851 | 599,756 |  |  | $ 593,851 |  | 599,756 |  |  |  |
Contractual interest rate |  |  |  |  | 4.50% |  |  |  | 4.50% |  |  |  |  |  |
Effective interest rate |  |  |  |  | 4.50% |  |  |  | 4.50% |  |  |  |  |  |
Gap |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  | $ 3,531,585 | 3,569,990 |  |  | $ 3,531,585 |  | 3,569,990 |  |  |  |
Contractual interest rate |  |  |  |  | 4.15% |  |  |  | 4.15% |  |  |  |  |  |
Effective interest rate |  |  |  |  | 4.15% |  |  |  | 4.15% |  |  |  |  |  |
Sutter Health |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  | $ 13,739,153 | 13,879,655 |  |  | $ 13,739,153 |  | 13,879,655 |  |  |  |
Contractual interest rate |  |  |  |  | 4.50% |  |  |  | 4.50% |  |  |  |  |  |
Effective interest rate |  |  |  |  | 4.50% |  |  |  | 4.50% |  |  |  |  |  |
Mortgage Notes Payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  | $ 182,758,762 | 176,948,438 |  |  | $ 182,758,762 |  | 176,948,438 | 195,739,481 |  |  |
Plus: unamortized mortgage premium, net of discount |  |  |  |  | 390,426 | 447,471 |  |  | 390,426 |  | 447,471 | 489,664 |  |  |
Less: unamortized deferred financing costs |  |  |  |  | (1,572,582) | (1,469,991) |  |  | (1,572,582) |  | (1,469,991) | (2,189,938) |  |  |
Net principal |  |  |  |  | $ 181,576,606 | 175,925,918 |  |  | $ 181,576,606 |  | 175,925,918 | 194,039,207 |  |  |
Mortgage Notes Payable | Subsequent Event | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate | 3.65% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Notes Payable | Subsequent Event | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate | 3.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term | 7 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Notes Payable | Accredo/Walgreens properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  |  | $ 8,538,000 |  |  |  |  | $ 8,538,000 | $ 6,853,442 | $ 8,538,000 |  |
Contractual interest rate |  |  |  |  |  | 3.80% |  |  |  |  | 3.80% |  |  |  |
Effective interest rate |  |  |  |  |  | 3.80% |  |  |  |  | 3.80% | 3.95% | 3.80% |  |
Mortgage Notes Payable | Six Dollar General properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  |  | $ 3,747,520 |  |  |  |  | $ 3,747,520 | $ 3,819,264 |  |  |
Contractual interest rate |  |  |  |  |  | 4.69% |  |  |  |  | 4.69% |  |  |  |
Effective interest rate |  |  |  |  |  | 4.69% |  |  |  |  | 4.69% |  |  |  |
Mortgage Notes Payable | Dana |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  |  | $ 4,466,865 |  |  |  |  | $ 4,466,865 | 4,551,250 |  |  |
Contractual interest rate |  |  |  |  |  | 4.56% |  |  |  |  | 4.56% |  |  |  |
Effective interest rate |  |  |  |  |  | 4.56% |  |  |  |  | 4.56% |  |  |  |
Mortgage Notes Payable | Northrop Grumman |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  |  | $ 5,518,589 |  |  |  |  | $ 5,518,589 | 5,666,866 |  |  |
Contractual interest rate |  |  |  |  |  | 4.40% |  |  |  |  | 4.40% |  |  |  |
Effective interest rate |  |  |  |  |  | 4.40% |  |  |  |  | 4.40% |  |  |  |
Mortgage Notes Payable | exp US Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  |  | $ 3,321,931 |  |  |  |  | $ 3,321,931 | 3,385,353 |  |  |
Effective interest rate |  |  |  |  |  | 4.25% |  |  |  |  | 4.25% |  |  |  |
Mortgage Notes Payable | Harley Davidson property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  |  | $ 0 |  |  |  |  | $ 0 | 6,748,029 |  |  |
Contractual interest rate |  |  |  |  |  | 4.25% |  |  |  |  | 4.25% |  |  |  |
Effective interest rate |  |  |  |  |  | 4.25% |  |  |  |  | 4.25% |  |  |  |
Mortgage Notes Payable | Wyndham |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  |  | $ 5,607,000 |  |  |  |  | $ 5,607,000 | 5,716,200 |  |  |
Effective interest rate |  |  |  |  |  | 4.34% |  |  |  |  | 4.34% |  |  |  |
Mortgage Notes Payable | Wyndham | (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate ( as a percent) |  |  |  |  |  |  |  |  |  |  | 2.05% |  |  |  |
Mortgage Notes Payable | Williams Sonoma |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  |  | $ 4,438,200 |  |  |  |  | $ 4,438,200 | 4,530,600 |  |  |
Effective interest rate |  |  |  |  |  | 4.34% |  |  |  |  | 4.34% |  |  |  |
Mortgage Notes Payable | Williams Sonoma | (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate ( as a percent) |  |  |  |  |  |  |  |  |  |  | 2.05% |  |  |  |
Mortgage Notes Payable | Omnicare |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  |  | $ 4,193,171 |  |  |  |  | $ 4,193,171 | 4,273,552 |  |  |
Contractual interest rate |  |  |  |  |  | 4.36% |  |  |  |  | 4.36% |  |  |  |
Effective interest rate |  |  |  |  |  | 4.36% |  |  |  |  | 4.36% |  |  |  |
Mortgage Notes Payable | EMCOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  |  | $ 2,811,539 |  |  |  |  | $ 2,811,539 | 2,862,484 |  |  |
Contractual interest rate |  |  |  |  |  | 4.35% |  |  |  |  | 4.35% |  |  |  |
Effective interest rate |  |  |  |  |  | 4.35% |  |  |  |  | 4.35% |  |  |  |
Mortgage Notes Payable | Husqvarna |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  |  | $ 6,379,182 |  |  |  |  | $ 6,379,182 | 6,379,182 |  |  |
Effective interest rate |  |  |  |  |  | 4.60% |  |  |  |  | 4.60% |  |  |  |
Mortgage Notes Payable | AvAir |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  |  | $ 19,950,000 |  |  |  |  | $ 19,950,000 | $ 14,575,000 |  | $ 19,950,000 |
Contractual interest rate |  |  |  |  |  | 380.00% |  |  |  |  | 380.00% |  |  |  |
Effective interest rate |  |  |  |  |  | 3.80% |  |  |  |  | 3.80% | 4.84% |  | 3.80% |
Mortgage Notes Payable | 3M |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  |  | $ 8,166,000 |  |  |  |  | $ 8,166,000 | $ 8,290,000 |  |  |
Effective interest rate |  |  |  |  |  | 5.09% |  |  |  |  | 5.09% |  |  |  |
Mortgage Notes Payable | 3M | (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate ( as a percent) |  |  |  |  |  |  |  |  |  |  | 2.25% |  |  |  |
Mortgage Notes Payable | Cummins |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  |  | $ 8,332,200 |  |  |  |  | $ 8,332,200 | 8,458,600 |  |  |
Effective interest rate |  |  |  |  |  | 5.16% |  |  |  |  | 5.16% |  |  |  |
Mortgage Notes Payable | Cummins | (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate ( as a percent) |  |  |  |  |  |  |  |  |  |  | 2.25% |  |  |  |
Mortgage Notes Payable | Former 24 Hour Fitness |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  |  | $ 0 |  |  |  |  | $ 0 | 6,283,898 |  |  |
Effective interest rate |  |  |  |  |  | 4.64% |  |  |  |  | 4.64% |  |  |  |
Monthly mortgage payment |  | $ 32,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Decrease in monthly mortgage payment |  | $ 8,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of reduced monthly payments | monthlyPayment |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |
Mortgage Notes Payable | Former 24 Hour Fitness | (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate ( as a percent) |  |  |  |  |  |  |  |  |  |  | 4.30% |  |  |  |
Mortgage Notes Payable | Texas Health |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  |  | $ 4,363,203 |  |  |  |  | $ 4,363,203 | 4,400,000 |  |  |
Contractual interest rate |  |  |  |  |  | 4.00% |  |  |  |  | 4.00% |  |  |  |
Effective interest rate |  |  |  |  |  | 4.00% |  |  |  |  | 4.00% |  |  |  |
Mortgage Notes Payable | Bon Secours |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  |  | $ 5,180,552 |  |  |  |  | $ 5,180,552 | 5,250,000 |  |  |
Contractual interest rate |  |  |  |  |  | 5.41% |  |  |  |  | 5.41% |  |  |  |
Effective interest rate |  |  |  |  |  | 5.41% |  |  |  |  | 5.41% |  |  |  |
Mortgage Notes Payable | Costco |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  |  | $ 18,850,000 |  |  |  |  | $ 18,850,000 | 18,850,000 |  |  |
Contractual interest rate |  |  |  |  |  | 4.85% |  |  |  |  | 4.85% |  |  |  |
Effective interest rate |  |  |  |  |  | 4.85% |  |  |  |  | 4.85% |  |  |  |
Mortgage Notes Payable | Taylor Fresh Foods property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  |  | $ 12,350,000 |  |  |  |  | $ 12,350,000 | 12,350,000 |  |  |
Contractual interest rate |  |  |  |  |  | 3.85% |  |  |  |  | 3.85% |  |  |  |
Effective interest rate |  |  |  |  |  | 3.85% |  |  |  |  | 3.85% |  |  |  |
Mortgage Notes Payable | Levins |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  |  | $ 2,032,332 |  |  |  |  | $ 2,032,332 | 2,079,793 |  |  |
Effective interest rate |  |  |  |  |  | 3.74% |  |  |  |  | 3.74% |  |  |  |
Mortgage Notes Payable | Levins | (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate ( as a percent) |  |  |  |  |  |  |  |  |  |  | 1.93% |  |  |  |
Mortgage Notes Payable | Levins | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance | $ 2,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate | 3.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Notes Payable | Island Pacific Supermarket |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  |  | $ 0 |  |  |  |  | $ 0 | 1,891,225 |  |  |
Effective interest rate |  |  |  |  |  | 3.74% |  |  |  |  | 3.74% |  |  |  |
Mortgage Notes Payable | Island Pacific Supermarket | (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate ( as a percent) |  |  |  |  |  |  |  |  |  |  | 1.93% |  |  |  |
Mortgage Notes Payable | Dollar General, Bakersfield |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  |  | $ 2,268,922 |  |  |  |  | $ 2,268,922 | 2,324,338 |  |  |
Effective interest rate |  |  |  |  |  | 3.38% |  |  |  |  | 3.38% |  |  |  |
Mortgage Notes Payable | Dollar General, Bakersfield | (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate ( as a percent) |  |  |  |  |  |  |  |  |  |  | 1.48% |  |  |  |
Mortgage Notes Payable | Rite Aid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  |  | $ 0 |  |  |  |  | $ 0 | 3,659,338 |  |  |
Effective interest rate |  |  |  |  |  | 3.25% |  |  |  |  | 3.25% |  |  |  |
Mortgage Notes Payable | Rite Aid | (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate ( as a percent) |  |  |  |  |  |  |  |  |  |  | 1.50% |  |  |  |
Mortgage Notes Payable | PMI Preclinical |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  |  | $ 4,020,418 |  |  |  |  | $ 4,020,418 | 4,118,613 |  |  |
Effective interest rate |  |  |  |  |  | 3.38% |  |  |  |  | 3.38% |  |  |  |
Mortgage Notes Payable | PMI Preclinical | (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate ( as a percent) |  |  |  |  |  |  |  |  |  |  | 1.48% |  |  |  |
Mortgage Notes Payable | PMI Preclinical | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance | $ 5,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate | 3.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Notes Payable | EcoThrift property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  |  | $ 0 |  |  |  |  | $ 0 | 2,639,237 |  |  |
Effective interest rate |  |  |  |  |  | 2.96% |  |  |  |  | 2.96% |  |  |  |
Mortgage Notes Payable | EcoThrift property | (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate ( as a percent) |  |  |  |  |  |  |  |  |  |  | 1.21% |  |  |  |
Mortgage Notes Payable | GSA (MSHA) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  |  | $ 1,752,092 |  |  |  |  | $ 1,752,092 | 1,796,361 |  |  |
Effective interest rate |  |  |  |  |  | 3.13% |  |  |  |  | 3.13% |  |  |  |
Mortgage Notes Payable | GSA (MSHA) | (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate ( as a percent) |  |  |  |  |  |  |  |  |  |  | 1.25% |  |  |  |
Mortgage Notes Payable | GSA (MSHA) | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance | $ 1,756,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate | 3.65% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Notes Payable | PreK San Antonio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  |  | $ 5,037,846 |  |  |  |  | $ 5,037,846 | 5,140,343 |  |  |
Contractual interest rate |  |  |  |  |  | 4.25% |  |  |  |  | 4.25% |  |  |  |
Effective interest rate |  |  |  |  |  | 4.25% |  |  |  |  | 4.25% |  |  |  |
Mortgage Notes Payable | Dinan Cars |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  |  | $ 0 |  |  |  |  | $ 0 | 2,710,834 |  |  |
Contractual interest rate |  |  |  |  |  | 2.76% |  |  |  |  | 2.76% |  |  |  |
Effective interest rate |  |  |  |  |  | 2.76% |  |  |  |  | 2.76% |  |  |  |
Repayments of debt |  |  |  | 650,000 |  |  |  |  |  |  |  |  |  |  |
Debt instrument, payment reserve |  |  |  | $ 133,182 |  |  |  |  |  |  |  |  |  |  |
Mortgage Notes Payable | Solar Turbines/Wood Group/ITW Rippey |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  |  | $ 9,214,700 |  |  |  |  | $ 9,214,700 | 9,434,692 |  |  |
Contractual interest rate |  |  |  |  |  | 3.35% |  |  |  |  | 3.35% |  |  |  |
Effective interest rate |  |  |  |  |  | 3.35% |  |  |  |  | 3.35% |  |  |  |
Mortgage Notes Payable | Dollar General, Big Spring |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  |  | $ 599,756 |  |  |  |  | $ 599,756 | 611,161 |  |  |
Contractual interest rate |  |  |  |  |  | 4.50% |  |  |  |  | 4.50% |  |  |  |
Effective interest rate |  |  |  |  |  | 4.50% |  |  |  |  | 4.50% |  |  |  |
Mortgage Notes Payable | Gap |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  |  | $ 3,569,990 |  |  |  |  | $ 3,569,990 | 3,643,166 |  |  |
Contractual interest rate |  |  |  |  |  | 4.15% |  |  |  |  | 4.15% |  |  |  |
Effective interest rate |  |  |  |  |  | 4.15% |  |  |  |  | 4.15% |  |  |  |
Mortgage Notes Payable | L-3 Communications |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  |  | $ 5,185,929 |  |  |  |  | $ 5,185,929 | 5,284,884 |  |  |
Contractual interest rate |  |  |  |  |  | 4.69% |  |  |  |  | 4.69% |  |  |  |
Effective interest rate |  |  |  |  |  | 4.69% |  |  |  |  | 4.69% |  |  |  |
Mortgage Notes Payable | Sutter Health |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  |  | $ 13,879,655 |  |  |  |  | $ 13,879,655 | 14,161,776 |  |  |
Contractual interest rate |  |  |  |  |  | 4.50% |  |  |  |  | 4.50% |  |  |  |
Effective interest rate |  |  |  |  |  | 4.50% |  |  |  |  | 4.50% |  |  |  |
Mortgage Notes Payable | Walgreens Santa Maria property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  |  | $ 3,172,846 |  |  |  |  | $ 3,172,846 | $ 3,000,000 |  |  | $ 3,217,500
Contractual interest rate |  |  |  |  |  | 4.25% |  |  |  |  | 4.25% |  |  |  |
Effective interest rate |  |  |  |  |  | 4.25% |  |  |  |  | 4.25% | 7.50% |  |  | 4.25%

X
- Definition Debt Instrument, Decrease in Periodic Payment + References No definition available. + Details
Name: | cik0001645873_DebtInstrumentDecreaseinPeriodicPayment
Namespace Prefix: | cik0001645873_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Debt Instrument, Number of Reduced Periodic Payments + References No definition available. + Details
Name: | cik0001645873_DebtInstrumentNumberofReducedPeriodicPayments
Namespace Prefix: | cik0001645873_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Debt Instrument, Payment Reserve + References No definition available. + Details
Name: | cik0001645873_DebtInstrumentPaymentReserve
Namespace Prefix: | cik0001645873_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The effective interest rate at the start of the reporting period. + References No definition available. + Details
Name: | cik0001645873_LineOfCreditFacilityInterestRateAtPeriodStart
Namespace Prefix: | cik0001645873_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the ratio of loans to assets ratio during the period. + References No definition available. + Details
Name: | cik0001645873_LoansToAssetsRatio
Namespace Prefix: | cik0001645873_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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