On May 3rd, 1973 Chicago's Sears Tower, the world's tallest building at that time (443 meters), is completed.
The Sears Tower is 1,454 feet high, 1,808 feet including twin antenna towers. The combined weight of the building is 222,500 tons - 445,000,000 lbs. The cost of the Sears Tower building was in excess of $150 million. The Sears Tower opened in 1973 and took 3 years to build. The building has 4.5 million gross square feet of floor space. The average sway of the building is approximately 6 inches from true center. The Sears Tower has approximately 16,100 bronze-tinted windows and has 6 roof-mounted robotic window washing machines. The Sears Tower was designed for more than 12,000 occupants, approximately 25,000 people enter the building each day and approximately 1.5 million tourists visit the Skydeck each year.
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