Designed by architects Skidmore, Owings & Merrill, the Sears Tower is composed of nine twenty-three-by-twenty-three-m towers bundled together, a type of design which allows for a building to have unlimited altitude. It is the largest private office complex in the world with a gross area of 410,000 square meters and 109 stories. Occupying an entire downtown Chicago block, the tower is comprised of sufficient steel to build fifty thousand cars, has enough concrete to complete an eight-lane, eight-kilometer-long highway, and enough wire to wrap around the earth one and three quarters times.

西尔斯大厦由建筑师史基摩、欧文斯和米瑞尔设计。大厦由九座23米见方的大楼组成，这种设计有无限向上延伸的空间。它是全球最大的私人办公综合大楼，占地总面积41万平方米，楼高109层。大厦可以说占据了整个芝加哥市中心的街区，建构大厦的钢铁足以制造五万部汽车，混凝土足以建造一条八车道八公里长的公路，电线可以绕地球一又四分之三圈。

(短文节选,本篇始于：风城巨烛──西尔斯)