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Even though they were ultimately built to 110 stories each, the Twin Towers were originally planned to have 80 to 90 floors. The Port Authority public relations staff recommended the change to make them the world's tallest buildings.
The Twin Towers, built in the 1970's, were New York's tallest building until they were destroyed in the terror attacks of September 11, 2001. The Empire State Building then became New York's tallest skyscraper, but now the Freedom Tower is set to regain the title for the World Trade Center site.