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DEBT OBLIGATIONS - Principal payments (Details) - Mortgages payable - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Scheduled principal repayments during the next five years    
2020 $ 13,530,000  
2021 22,963,000  
2022 46,083,000  
2023 30,182,000  
2024 62,819,000  
Thereafter 264,701,000  
Total $ 440,278,000 $ 423,096,000