Accenture Tower (500 West Madison) is a 42-story, 588-foot (180 m) skyscraper in Chicago, Illinois. Located between Clinton and Canal Streets on Madison Street, the structure was designed by the architecture firm Murphy/Jahn in a late modernist style. The building, previously named the Northwestern Atrium Center and Citigroup Center, was constructed between 1984 and 1987 on the air rights obtained by the destruction of the head house of the 1911 North Western Station. The building contains retail and offices, and is connected to the platforms of Ogilvie Transportation Center. On July 10, 2019, the building was officially renamed to Accenture Tower after a commitment from Accenture PLC. Shooting On 8 December 2006 a man opened fire in a law office located on the 38th floor of the Citigroup Center. Four people, including the gunman, were killed. One person survived. See also List of buildings List of skyscrapers List of tallest buildings in Chicago List of tallest buildings in the United States World's tallest structures References External links Skyscraper office buildings in Chicago Citigroup buildings Bank buildings in Illinois Headquarters in the United States Helmut Jahn buildings 1987 establishments in Illinois Office buildings completed in 1987