— — the black tower the wind grew up around.
“The tallest building in the Western Hemisphere for nearly twenty-five years, holding the southwest corner of the Loop in nine bundled tubes of black steel. From the 103rd-floor Skydeck the lake stretches east past Navy Pier, the Sears name lingers in older Chicagoans' mouths, and the glass ledges step out over Wacker Drive a quarter-mile below. A building Chicago measures itself against.
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Willis Tower stands at 233 South Wacker Drive on the southwest corner of the Chicago Loop, two blocks west of the Chicago River's South Branch. It rises 1,451 feet to the roof and 1,729 feet to the antenna tip, with 110 occupied floors. Completed in 1973 as the Sears Tower for the Sears, Roebuck headquarters, it held the title of world's tallest building for nearly twenty-five years, until the Petronas Towers in Kuala Lumpur topped it in 1998.
The structural system, designed by Bangladeshi-American engineer Fazlur Rahman Khan of Skidmore, Owings & Merrill, is a bundled-tube frame of nine 75-by-75-foot square tubes rising from a 225-foot base. Tubes drop away in stages, two at the 50th floor, two more at the 66th, three at the 90th, leaving the final two to reach the roof. The exterior is black anodized aluminum cladding over a steel frame, the combination that gave the building its signature dark profile against the Chicago sky.
The Skydeck on the 103rd floor opened in 1974 and now draws about 1.7 million visitors a year. The Ledge, a set of glass-floored boxes added in 2009, cantilever 4.3 feet out from the west face and look straight down 1,353 feet to Wacker Drive. On a clear day the view reaches across the lake to Indiana, Michigan, and Wisconsin, four states at once. The building was renamed Willis Tower in 2009 after the Willis Group leased a large block of office space.