Zifeng Tower vs One57A1

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Zifeng Tower (Greenland Center-Zifeng Tower or Greenland Square Zifeng Tower, previously Nanjing Greenland Financial Center) is a 450-meter (1,480 feet ) supertall skyscraper (special class of skyscraper) in Nanjing, Jiangsu. The 89-story building finished in 2010 includes office and retail space up to floor 41. Floors 49-71 feature a hotel, a lot of restaurants, and a public observatory on the 72 floor. The tower's stepping is practical, helping to separate those sections.

The building is currently the tallest in Nanjing and Jiangsu province, the eleventh tallest in China and the twentieth tallest on earth. Architectural firm Skidmore, Owings and Merrill designed the building, headed by Adrian Smith. The Tower occupies an area of 18,721 square meters. The Nanjing Greenland InterContinental Hotel is located within the tower.

Source: Wikipedia

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One57, formerly known as Carnegie 57, is a 75-story, 1,005-foot (306 m) supertall skyscraper in 157 West 57th Street between Sixth and Seventh Avenues in the Midtown neighborhood of Manhattan, New York City. The construction has 92 condominium units in addition to a new Park Hyatt Hotel with 210 rooms, the flagship Hyatt property.The tower, developed by Extell Development Company and designed by Christian de Portzamparc, was the first ultra-luxury condominium tower along the stretch of 57th Street which was then named Billionaires' Row. Upon completion in 2014, it was the tallest residential building in the city for a month or two until the completion of 432 Park Avenue.

Source: Wikipedia