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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.
One World Trade Center, New York City - 1,776 Feet. Taking first place as the tallest building in the US is the One World Trade Center, with an actual height of 1,776 feet. The building, which is located in New York City, was completed in the year 2014 to become the 6th tallest building in the world.