The Jin Mao Tower is an 88-storey landmark skyscraper in the Lujiazui area of the Pudong district of Shanghai, People's Republic of China. It contains offices and the Grand Hyatt Shanghai hotel. Until 2007 it was the tallest building in the PRC, the fifth tallest in the World by roof height and the seventh tallest by pinnacle height. Along with the Oriental Pearl Tower, it is part of the Pudong skyline. Its height was surpassed on September 14, 2007 by the Shanghai World Financial Center which is next to the building.The Shanghai Tower, a 128-story building located next to these two buildings and now under construction, will be even taller.
The building is located on a 24 000 m sq plot of land near the Lujiazui metro station and was built at an estimated cost of 530 million USD.
It was designed by the Chicago office of Skidmore, Owings & Merrill. Its postmodern form, whose complexity rises as it ascends, draws on traditional Chinese architecture such as the tiered pagoda, gently stepping back to create a rhythmic pattern as it rises. Like the Petronas Towers in Malaysia, the building's proportions revolve around the number 8, associated with prosperity in Chinese culture. The 88 floors (93 if the spire floors are counted) are divided into 16 segments, each of which is 1/8 shorter than the 16-story base.
The foundations rest on 1,062 high-capacity steel piles driven 83.5 m deep in the ground to compensate for poor upper-strata soil conditions. At the time those were the longest steel piles ever used in a land-based building. The piles are capped by a 4 m-thick concrete raft 19.6 m underground. The basement's surrounding slurry wall is 1 m thick, 36 m high and 568 m long, and composed of 20,500 m qb of reinforced concrete.