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Rentals Under Operating Leases (Details)
Dec. 31, 2019
USD ($)
Leases, Operating [Abstract]  
2020 $ 11,855,034
2021 10,172,259
2022 6,528,706
2023 4,437,662
2024 2,699,975
Thereafter 3,888,553
Total $ 39,582,189 [1]
[1] The above minimum lease payments to be received do not include reimbursements from the USPS for real estate taxes.