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Note 7 - Mortgage Notes Payable - Mortgage Notes Payable (Details) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Mortgage Notes Payable, net |  | $ 86,255,680 | $ 120,029,696
Mortgage Notes [Member] |  |  |
Mortgage Notes Payable |  | 86,929,031 | 120,788,005
Unamortized loan costs |  | (673,351) | (758,309)
Mortgage Notes [Member] | Waterman Plaza [Member] |  |  |
Mortgage Notes Payable | [1] | $ 0 | 3,207,952
Interest rate, variable | [1],[2] | 0.00% |
Mortgage Notes [Member] | World Plaza [Member] |  |  |
Mortgage Notes Payable | [3],[4] | $ 0 | 5,802,568
Interest rate, variable | [2],[3],[4] | 2.91% |
Maturity date | [3],[4] | Jul. 05, 2021 |
Mortgage Notes [Member] | Garden Gateway Plaza [Member] |  |  |
Mortgage Notes Payable | [1] | $ 0 | 5,861,523
Maturity date | [1] | Aug. 05, 2021 |
Interest rate | [1],[2] | 5.00% |
Mortgage Notes [Member] | The 300 N.P [Member] |  |  |
Mortgage Notes Payable |  | $ 2,243,328 | 2,273,478
Maturity date |  | Jun. 11, 2022 |
Interest rate | [2] | 4.95% |
Mortgage Notes [Member] | Highland Court [Member] |  |  |
Mortgage Notes Payable | [1] | $ 0 | 6,274,815
Maturity date | [1] | Sep. 01, 2022 |
Interest rate | [1],[2] | 3.82% |
Mortgage Notes [Member] | Dakota Center [Member] |  |  |
Mortgage Notes Payable |  | $ 9,734,220 | 9,900,279
Maturity date |  | Jul. 06, 2024 |
Interest rate | [2] | 4.74% |
Mortgage Notes [Member] | Research Parkway [Member] |  |  |
Mortgage Notes Payable |  | $ 1,719,390 | 1,760,432
Maturity date |  | Jan. 05, 2025 |
Interest rate | [2] | 3.94% |
Mortgage Notes [Member] | Arapahoe Center [Member] |  |  |
Mortgage Notes Payable |  | $ 7,812,125 | 7,932,255
Maturity date |  | Jan. 05, 2025 |
Interest rate | [2] | 4.34% |
Mortgage Notes [Member] | Union Town Center [Member] |  |  |
Mortgage Notes Payable |  | $ 8,197,495 | 8,315,550
Maturity date |  | Jan. 05, 2025 |
Interest rate | [2] | 4.28% |
Mortgage Notes [Member] | One Park Centre [Member] |  |  |
Mortgage Notes Payable |  | $ 6,304,625 | 6,385,166
Maturity date |  | Sep. 05, 2025 |
Interest rate | [2] | 4.77% |
Mortgage Notes [Member] | Genesis Plaza [Member] |  |  |
Mortgage Notes Payable |  | $ 6,196,202 | 6,276,273
Maturity date |  | Sep. 06, 2025 |
Interest rate | [2] | 4.71% |
Mortgage Notes [Member] | Shea Center II [Member] |  |  |
Mortgage Notes Payable |  | $ 17,559,316 | 17,727,500
Maturity date |  | Jan. 05, 2026 |
Interest rate | [2] | 4.92% |
Mortgage Notes [Member] | Executive Office Park [Member] |  |  |
Mortgage Notes Payable | [1] | $ 0 | 2,985,998
Maturity date | [1] | Jun. 01, 2027 |
Interest rate | [1],[2] | 4.83% |
Mortgage Notes [Member] | West Fargo Industrial [Member] |  |  |
Mortgage Notes Payable |  | $ 4,177,334 | 4,262,718
Maturity date |  | Aug. 05, 2029 |
Interest rate | [2] | 3.27% |
Mortgage Notes [Member] | Grand Pacific Center [Member] |  |  |
Mortgage Notes Payable | [5] | $ 3,649,729 | 3,738,142
Maturity date | [5] | Aug. 01, 2037 |
Interest rate | [2],[5] | 4.02% |
Mortgage Notes [Member] | Subtotal, Presidio Property Trust, Inc. Properties [Member] |  |  |
Mortgage Notes Payable |  | $ 67,593,764 | 92,704,649
Mortgage Notes [Member] | Model Home [Member] |  |  |
Mortgage Notes Payable | [4] | $ 19,335,267 | $ 28,083,356
Mortgage Notes [Member] | Model Home [Member] | Minimum [Member] |  |  |
Maturity date | [4],[6] | Dec. 31, 2021 |
Interest rate |  | 2.50% |
Mortgage Notes [Member] | Model Home [Member] | Maximum [Member] |  |  |
Maturity date | [4],[6] | Dec. 31, 2024 |
Interest rate |  | 5.63% |
[1] | Waterman Plaza and Garden Gateway Plaza were sold during the first quarter of 2021, while Highland Court and Executive Office Park were sold in the second quarter of 2021.
[2] | Interest rates as of September 30, 2021.
[3] | During June 2021, this loan was paid in full with cash from the sale of other properties and excess cash on hand.
[4] | Property held for sale as of September 30, 2021. There were three model homes included as real estate assets held for sale.
[5] | Interest rate is subject to reset on September 1, 2023.
[6] | Our model homes have stand-alone mortgage note at interest rates ranging from 2.50% to 5.63% per annum as of September 30, 2021.

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