The Empire State Building in New York City was the tallest building in the world from 1931-1972 and was the first building to have over 100 floors. The skyscraper has 10 million bricks, 6,514 windows and 73 elevators.
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The Pentagon in Virginia is the world's largest office building by floor size. Over half of its 6,500,000 square feet is used as offices. It takes a person fifteen to twenty minutes to walk around the Pentagon once.