The Jin Mao Tower (Golden Prosperity Building) is an 88-story landmark supertall skyscraper in the Lujiazui area of the Pudong district of Shanghai, People's Republic of China. It contains offices and the Shanghai Grand Hyatt hotel. It was surpassed on September 14, 2007 by the Shanghai World Financial Center.
The building is located on a 24 000m² plot of land near the Lujiazui metro station.
It was designed by the Chicago office of Skidmore, Owings & Merrill. The 88 floors (93 if the spire floors are counted) are divided into 16 segments, each of which is 1/8th shorter than the 16-story base. The tower is built around an octagon-shaped concrete shear wall core surrounded by 8 exterior composite supercolumns and 8 exterior steel columns. Three sets of 8 two-story high outrigger trusses connect the columns to the core at six of the floors to provide additional support.
The building employs an advanced structural engineering system which fortifies it against typhoon winds of up to 200 km/h (with the top swaying by a maximum of 75 cm) and earthquakes of up to 7 on the Richter scale. The steel shafts have shear joints that act as shock absorbers to cushion the lateral forces imposed by winds and quakes, and the swimming pool on the 57th floor.
The exterior curtain wall is made of glass, stainless steel, aluminium, and granite, and is criss-crossed by complex latticework cladding made of aluminum alloy pipes.
Official dedication was August 28, 1998, a date also chosen with the number 8 in mind. The building was fully operational in 1999.
It reportedly has a daily maintenance cost of 1 million (US$121,000).
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