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Mortgage Notes Payable (Scheduled Principal Payments of Mortgage Notes Payable) (Details)	Mar. 31, 2019 USD ($)
Debt Instrument [Line Items]
Nine months remaining in 2019	$ 7,749,769
2020	28,851,696
2021	21,612,563
2022	10,055,656
2023	1,783,291
Thereafter	77,079,574
Total	147,132,549
Presidio Property Trust, Inc. [Member]
Debt Instrument [Line Items]
Nine months remaining in 2019	1,496,106
2020	16,537,438
2021	10,756,794
2022	10,055,656
2023	1,783,291
Thereafter	77,079,574
Total	117,708,859
Model Home [Member]
Debt Instrument [Line Items]
Nine months remaining in 2019	6,253,663
2020	12,314,258
2021	10,855,769
Total	$ 29,423,690

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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