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Citigroup Center is a 42 story, 588-foot (180 m) skyscraper in Chicago, Illinois. Located at 500 W. Madison (between Clinton and Canal Streets), the structure was designed by the architecture firm Murphy/Jahn in a late modernist style. The building, previously named the Northwestern Atrium Center, was constructed between 1984 and 1987 on the air rights obtained by the destruction of the headhouse of the 1911 North Western Station.

The Time-Life Building, located at 1271 Avenue of the Americas (6th Avenue) in Rockefeller Center in New York opened in 1959 and designed by the Rockefeller family's architect Wallace Harrison, of Harrison, Abramovitz, and Harris. It was the first expansion of Rockefeller Center west of the Avenue of the Americas. Air rights for the building were purchased from the Roxy Theatre to the west. The Roxy would be torn down in 1960 and an office building that is connected to Time-Life was built.