the willis tower

Introduction to Skydeck Chicago and the Willis Tower The Willis Tower (formerly the Sears Tower) is a 110-story, 1,451-foot skyscraper located within the Loop community of Chicago. It was designed by Bruce Graham and Fazlur Rahman Khan of Skidmore, Owings & Merrill and opened in 1973, becoming the world’s tallest building for nearly 25 years. […]