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RELATED PARTY TRANSACTIONS (UNITED DOMINION REALTY, L.P.) (Details) - United Dominion Realty L.P. - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Related party transactions          
Related party management fees $ 3,900 $ 4,600 $ 12,800 $ 12,700  
Debt Instrument, Interest Rate Period End 3.01%   3.01%    
Notes payable due to the General Partner $ 665,603   $ 665,603   $ 637,233
Interest expense, related party 6,581 6,983 19,765 21,358  
UDR, Inc.          
Related party transactions          
General and administrative expenses allocated to the Operating Partnership by UDR $ 3,500 $ 2,700 $ 10,100 $ 9,700  
Note due August 2021          
Related party transactions          
Debt Instrument, Interest Rate Period End 5.34%   5.34%    
Notes payable due to the General Partner $ 5,500   $ 5,500   5,500
Note due December 2023          
Related party transactions          
Debt Instrument, Interest Rate Period End 5.18%   5.18%    
Notes payable due to the General Partner $ 83,196   $ 83,196   83,196
Note due April 2026          
Related party transactions          
Debt Instrument, Interest Rate Period End 4.12%   4.12%    
Notes payable due to the General Partner $ 184,638   $ 184,638   184,638
Note due November 2028          
Related party transactions          
Debt Instrument, Interest Rate Period End 4.69%   4.69%    
Notes payable due to the General Partner $ 133,205   $ 133,205   133,205
Note due December 2028          
Related party transactions          
Debt Instrument, Interest Rate Period End 3.01%   3.01%    
Notes payable due to the General Partner $ 259,064   $ 259,064   $ 230,694