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Mortgages Payable - Summary of Maturities (Details) - Mortgages Payable - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Maturity of mortgages payable    
2020 $ 10,500  
2021 68,800  
2022 111,800  
2023 20,600  
2024 112,200  
Thereafter 10,800  
Totals $ 334,709 $ 408,419