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Mortgage Notes Payable (Scheduled Principal Payments of Mortgage Notes Payable) (Details)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]  
2018 $ 3,200,459
2019 17,958,088
2020 32,677,403
2021 14,491,885
2022 10,137,352
Thereafter 83,540,493
Total 162,005,679
Office/Industrial Properties [Member]  
Debt Instrument [Line Items]  
2018 1,933,700
2019 2,288,924
2020 21,158,443
2021 14,491,885
2022 10,137,352
Thereafter 83,540,493
Total 133,550,796
Model Home Properties [Member]  
Debt Instrument [Line Items]  
2018 1,266,759
2019 15,669,164
2020 11,518,960
Total $ 28,454,883