The Friday File: The nearly completed One World Trade Center has the honor of being the priciest skyscraper ever built at $3.9 billion. The two buildings tied for second were each built for a paltry $1.9 billion. As for height, OWTC comes in third on the planet at 1,776 feet including the spire, but first in the western hemisphere. The tallest building, the Burj Khalifa in Dubai, is 2,717 feet.