Once the structure's height is verified, it will become the tallest building in the Americas. Last year, while it was still under construction, "One" was already taller than the Empire State building by 21 feet.
Installation of the spire was supposed to happen Monday, but it was delayed by bad weather.
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The final section of the new World Trade Center's spire was raised to the top of "One" on Thursday. The section -- the 17th and 18th pieces -- will top off the building at the iconic height of
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