It was considered to be both technically and financially efficient: at 1,400 feet, it offered more office space and was elevated higher than the Empire State Building, all while costing significantly less. The Sears Tower in Chicago was the first building to utilize this novel design. Khan invented the “bundled-tube” design, and these nine tubes created the skyscraper’s core framework.Īs the building rose in elevation, this approach ensured big open offices on the lower floors with unimpeded city views. The varied heights allow the structure to step back, fulfilling setback restrictions and generating the building’s famous staggering appearance. The architects designed a superstructure made up of nine interconnected tubes of varied heights separated into squares that function as distinct structures connected together as one. After consulting with municipal, state, and federal authorities, the company presented Sears with two potential choices: a two-block region bordered by Jackson Boulevard, Franklin Street, Wacker Drive, and Adams Street, or the Goose Island area. Sears ordered its advisors to submit a recommendation for a location. Sears management wanted to concentrate the thousands of personnel spread over the Chicago metro into a single location. With over 350,000 workers, Sears was considered the world’s biggest retailer in 1969. Highsmith, Public domain, via Wikimedia Commons The Willis Tower (previously Sears Tower) in Chicago, Illinois Carol M. The Willis Tower’s height is recorded as being just over 1,400 feet high and comprises 108 levels in total. Additional office space was also required in the plan to accommodate the company’s expected growth. Skidmore, Owings & Merrill was commissioned by Sears to create an office tower that would accommodate its headquarters as well as the various offices they had distributed around Chicago in one structure. The Willis Tower, which soars over the windswept metropolis of Chicago, was once the highest skyscraper in the world when it was completed in 1973. 1.1.1 Law Suits Filed During Construction.
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