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Mortgage Notes Payable (Scheduled Principal Payments of Mortgage Notes Payable) (Details)
Sep. 30, 2018
USD ($)
Debt Instrument [Line Items]  
Three months remaining in 2018 $ 852,751
2019 14,572,715
2020 38,380,058
2021 24,330,007
2022 10,154,452
Thereafter 84,331,696
Total 172,621,679
Presidio Property Trust, Inc. [Member]  
Debt Instrument [Line Items]  
Three months remaining in 2018 537,754
2019 2,307,005
2020 27,187,327
2021 14,518,280
2022 10,154,452
Thereafter 84,331,696
Total 139,036,514
Model Home [Member]  
Debt Instrument [Line Items]  
Three months remaining in 2018 314,997
2019 12,265,710
2020 11,192,731
2021 9,811,727
Total $ 33,585,165