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Real Estate Assets (Summary of Future Minimum Rental Revenues under Existing Leases on Office/Industiral and Retail Propierties) (Details) - Office/Industrial and Retail Properties [Member]
Dec. 31, 2018
USD ($)
Operating Leased Assets [Line Items]  
2019 $ 16,810,794
2020 14,429,223
2021 10,649,516
2022 7,425,332
2023 4,178,058
Thereafter 4,615,807
Totals $ 58,108,730