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The Sears Tower is a supertall skyscraper in Chicago, Illinois, and the tallest building in the United States since 1973. By the measurement from the ground to the top of the antenna/spire it is the tallest building in the world; it surpassed World Trade Center in this capacity by 58 cm (1.9 ft) via a short extension being installed on one of Sears' antennas on June 5, 2000. By all other measures (official height, roof height, and highest occupied floor) the Sears Tower was always taller than the World Trade Center. Commissioned by Sears, Roebuck and Company, it was designed by chief architect Bruce Graham and structural engineers Srinivasa "Hal" Iyengar and Fazlur Khan of Skidmore, Owings & Merrill.