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One World Trade Center already is New York's tallest building. And when the last pieces of its spire rise to the roof — weather permitting — the 104-floor skyscraper that replaces the fallen twin towers will be just feet from becoming the highest in the Western Hemisphere. The Port Authority of New York and New Jersey says the spire pieces plus a steel beacon will then be lifted at a later date from the rooftop to cap the building at 1,776 feet. The spire will serve as a world-class broadcast antenna.