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Note 7 - Mortgage Notes Payable - Mortgage Notes Payable (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020
Mortgage Notes Payable, net |  | $ 88,859,832 | $ 120,029,696
Mortgage Notes [Member] |  |  |
Mortgage Notes Payable |  | 89,422,132 | 120,788,005
Unamortized loan costs |  | (562,300) | (758,309)
Mortgage Notes [Member] | Waterman Plaza [Member] |  |  |
Mortgage Notes Payable | [1] | 0 | 3,207,952
Mortgage Notes [Member] | World Plaza [Member] |  |  |
Mortgage Notes Payable | [2],[3] | 0 | 5,802,568
Mortgage Notes [Member] | Garden Gateway Plaza [Member] |  |  |
Mortgage Notes Payable | [1] | 0 | 5,861,523
Mortgage Notes [Member] | The 300 N.P [Member] |  |  |
Mortgage Notes Payable | [4] | $ 2,232,923 | 2,273,478
Interest rate | [4],[5] | 4.95% |
Maturity date | [4] | Jun. 11, 2022 |
Mortgage Notes [Member] | Highland Court [Member] |  |  |
Mortgage Notes Payable | [1] | $ 0 | 6,274,815
Interest rate | [1],[5] | 3.82% |
Mortgage Notes [Member] | Dakota Center [Member] |  |  |
Mortgage Notes Payable |  | $ 9,677,108 | 9,900,279
Interest rate | [5] | 4.74% |
Maturity date |  | Jul. 06, 2024 |
Mortgage Notes [Member] | Research Parkway [Member] |  |  |
Mortgage Notes Payable |  | $ 1,705,438 | 1,760,432
Interest rate | [5] | 3.94% |
Maturity date |  | Jan. 05, 2025 |
Mortgage Notes [Member] | Arapahoe Center [Member] |  |  |
Mortgage Notes Payable |  | $ 7,770,887 | 7,932,255
Interest rate | [5] | 4.34% |
Maturity date |  | Jan. 05, 2025 |
Mortgage Notes [Member] | Union Town Center [Member] |  |  |
Mortgage Notes Payable |  | $ 8,173,568 | 8,315,550
Interest rate | [5] | 4.28% |
Maturity date |  | Jan. 05, 2025 |
Mortgage Notes [Member] | One Park Centre [Member] |  |  |
Mortgage Notes Payable |  | $ 6,276,849 | 6,385,166
Interest rate | [5] | 4.77% |
Maturity date |  | Sep. 05, 2025 |
Mortgage Notes [Member] | Genesis Plaza [Member] |  |  |
Mortgage Notes Payable |  | $ 6,168,604 | 6,276,273
Interest rate | [5] | 4.71% |
Maturity date |  | Sep. 06, 2025 |
Mortgage Notes [Member] | Shea Center II [Member] |  |  |
Mortgage Notes Payable |  | $ 17,494,527 | 17,727,500
Interest rate | [5] | 4.92% |
Maturity date |  | Jan. 05, 2026 |
Mortgage Notes [Member] | Executive Office Park [Member] |  |  |
Mortgage Notes Payable | [1] | $ 0 | 2,985,998
Interest rate | [1],[5] | 4.83% |
Maturity date | [1] | Jun. 01, 2027 |
Mortgage Notes [Member] | West Fargo Industrial [Member] |  |  |
Mortgage Notes Payable |  | $ 4,148,405 | 4,262,718
Interest rate | [5] | 3.27% |
Maturity date |  | Aug. 05, 2029 |
Mortgage Notes [Member] | Grand Pacific Center [Member] |  |  |
Mortgage Notes Payable | [6],[7] | $ 3,619,695 | 3,738,142
Interest rate | [5],[6],[7] | 4.02% |
Maturity date | [6],[7] | Aug. 01, 2037 |
Mortgage Notes [Member] | Subtotal, Presidio Property Trust, Inc. Properties [Member] |  |  |
Mortgage Notes Payable |  | $ 67,268,004 | 92,704,649
Mortgage Notes [Member] | Model Home [Member] |  |  |
Mortgage Notes Payable | [3] | $ 22,154,128 | $ 28,083,356
[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] | During June 2021, this loan was paid in full with cash from the sale of other properties and excess cash on hand.
[3] | Properties held for sale as of December 31, 2021. Five model homes were included as held for sale.
[4] | The mortgage note payable for 300 N.P. is an amortizing loan with a balloon payment of $2.2 million due at maturity, on June 11, 2022, and is no longer subject to defeasance or yield maintenance. The Company expects to pay this note in full at or before maturity with proceeds from property sales, property financing and other available cash on hand.
[5] | Interest rates as of December 31, 2021.
[6] | Interest rate is subject to reset on September 1, 2023.
[7] | Property was listed as held for sale in February 2022.

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