Towering over the windy city of Chicago, the Willis Tower (formerly known as Sears Tower) was once the tallest building in the world upon its completion in 1973. Sears, Roebuck, & Company commissioned Skidmore, Owings, & Merrill to design an office building that would house their headquarters and the many offices they had scattered around Chicago in one building. The design also had to incorporate extra office space for the anticipated future growth of the company. The building is 108 stories tall, rising 1,450 feet above the city. The height of the building is due to spacial needs. The company analyzed their current spacial needs, as well as the space needed for growth up to the year 2003 being as meticulous as determining the number of desks for personnel. SOM proposed a superstructure of nine interlocking tubes of varying heights, divided in 75' x 75' squares that are separate buildings joined together as one.
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