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Mortgage Notes Payable (Scheduled Principal Payments of Mortgage Notes Payable) (Details)
Jun. 30, 2018
USD ($)
Debt Instrument [Line Items]  
Six months remaining in 2018 $ 2,059,066
2019 16,603,641
2020 38,291,586
2021 20,964,948
2022 10,154,598
Thereafter 84,311,351
Total 172,385,190
Presidio Property Trust, Inc. [Member]  
Debt Instrument [Line Items]  
Six months remaining in 2018 1,048,481
2019 2,307,005
2020 27,222,208
2021 14,514,159
2022 10,154,598
Thereafter 84,311,351
Total 139,557,802
Model Home [Member]  
Debt Instrument [Line Items]  
Six months remaining in 2018 1,010,585
2019 14,296,636
2020 11,069,378
2021 6,450,789
Total $ 32,827,388