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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Restricted Cash and Cash Equivalent | $ 3,288 | $ 2,377
Deferred costs accumulated amortization | 116,737 | 113,959
Accumulated amortization of acquired lease intangible assets | 305,744 | 284,880
Accumulated accretion of acquired lease intangible liabilities | $ 166,590 | $ 145,966
Common stock, par value per share | $ 0.01 | $ 0.01
Common stock, shares authorized | 220,000,000 | 220,000,000
Common stock, shares issued | 171,209,046 | 169,680,138
Treasury stock, shares held at cost | 477,126 | 459,828
Exchangeable operating partnership units aggregate redemption value | $ 51,174 | $ 34,878
Partnership Interest [Member] |  |
Restricted Cash and Cash Equivalent | 3,288 | 2,377
Deferred costs accumulated amortization | 116,737 | 113,959
Accumulated amortization of acquired lease intangible assets | 305,744 | 284,880
Accumulated accretion of acquired lease intangible liabilities | $ 166,590 | $ 145,966
General partner units, outstanding | 171,209,046 | 169,680,138
Limited partner units, outstanding | 760,046 | 765,046

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