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The Empire State Building is an iconic office building known as "the Most Famous Skyscraper in the World." Construction began in 1930, and the grand opening was held on May 1, 1931. It was the world's tallest free-standing structure until 1967 and the world's tallest skyscraper for over 40 years. It was displaced in 1972 by the construction of the World Trade Center towers. Today it stands as the tallest building in New York City, a sad, but defiant, reminder of the World Trade Center tragedy.

http://science.howstuffworks.com/engineering/structural/empire-state-building.htm

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