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CONSOLIDATED BALANCE SHEETS (UNITED DOMINION REALTY, L.P.) (Parenthetical) - shares | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Partners' capital: |  |  |  |
Operating Partnership units outstanding related to limited partner | 184,064,000 | 183,637,000 | 183,351,000 | 183,279,000
United Dominion Realty L.P. |  |  |  |
Partners' capital: |  |  |  |
OP units outstanding related to general partner | 110,883 | 110,883 |  |
Operating Partnership units outstanding related to limited partner | 183,952,659 | 183,525,660 |  |

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