Zifeng Tower (Greenland Center-Zifeng Tower or Greenland Square Zifeng Tower, formerly Nanjing Greenland Financial Center)[4][5] is a 450-meter (1,480ft) supertall skyscraper (special class of skyscraper) in Nanjing, Jiangsu. The 66-story building completed in 2010 comprises retail and office. Floors 49–71 feature a hotel, numerous restaurants, and a public observatory. The tower's stepping is functional; office, hotel, and retail are located above grade, while the restaurants and the public observatory are housed at the top of the tower.[4] The building is currently the tallest in Nanjing and Jiangsu province, the eleventh tallest in China and the twentieth tallest in the world.