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Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares | Mar. 31, 2020 | Dec. 31, 2019
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Private Perpetual Preferred Units, Series 2019 |  |
Capital |  |
Private perpetual preferred units, liquidation preference (in USD per share) | $ 13.52 | $ 13.52
Private perpetual preferred units, issued (in shares) | 4,664,038 | 4,610,383
Private perpetual preferred units, outstanding (in shares) | 4,664,038 | 4,610,383
Private Perpetual Preferred Units, Series 2014 |  |
Capital |  |
Private perpetual preferred units, liquidation preference (in USD per share) | $ 16.62 | $ 16.62
Private perpetual preferred units, issued (in shares) | 1,560,360 | 1,560,360
Private perpetual preferred units, outstanding (in shares) | 1,560,360 | 1,560,360
Series PR Operating Partnership Units |  |
Capital |  |
Limited partner operating partnership units, outstanding (in shares) | 84,899,960 | 81,387,763
Series ES operating partnership units |  |
Capital |  |
Limited partner operating partnership units, outstanding (in shares) | 25,359,132 | 25,809,604
Series 60 operating partnership units |  |
Capital |  |
Limited partner operating partnership units, outstanding (in shares) | 6,824,249 | 7,025,089
Series 250 operating partnership units |  |
Capital |  |
Limited partner operating partnership units, outstanding (in shares) | 3,464,875 | 3,535,197
ESRT | Series PR Operating Partnership Units |  |
Capital |  |
General partner operating partnership units, outstanding (in shares) | 2,976,762 | 2,996,520
Limited partner operating partnership units, outstanding (in shares) | 174,151,247 | 178,897,876

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