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Mortgages Payable - Summary of Maturities (Details) - Mortgages payable - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Maturity of mortgages payable    
2021 $ 26,100  
2022 111,800  
2023 20,600  
2024 112,200  
2025 700  
Thereafter 10,100  
Totals $ 281,521 $ 299,631