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Mortgage Notes Payable (Scheduled Principal Payments of Mortgage Notes Payable) (Details)
Sep. 30, 2017
USD ($)
Debt Instrument [Line Items]  
Three months remaining in 2017 $ 774,370
2018 3,651,695
2019 18,982,595
2020 33,158,618
2021 14,496,465
Thereafter 93,637,314
Total 164,701,057
Presidio Property Trust, Inc. [Member]  
Debt Instrument [Line Items]  
Three months remaining in 2017 474,791
2018 1,931,368
2019 2,286,504
2020 21,156,934
2021 14,496,465
Thereafter 93,637,314
Total 133,983,376
Model Home [Member]  
Debt Instrument [Line Items]  
Three months remaining in 2017 299,579
2018 1,720,327
2019 16,696,091
2020 12,001,684
Total $ 30,717,681