One World Trade Center is the name of two buildings. It most commonly refers to the primary building of the new World Trade Center complex in Lower Manhattan, New York City, and the tallest skyscraper in the Western Hemisphere. The 104-story supertall structure, which shares a name with the northern Twin Tower in the original World Trade Center that was destroyed in the September 11 attacks, stands on the northwest corner of the 16-acre (6.5 ha) World Trade Center site, on the site of the original 6 World Trade Center. The building is bordered to the west by West Street, to the north by Vesey Street, to the south by Fulton Street, and to the east by Washington Street.
Construction on below-ground utility relocations, footings, and foundations for the building began on April 27, 2006. On March 30, 2009, the Port Authority of New York and New Jersey confirmed that the building would be known by its legal name, One World Trade Center, rather than the colloquial name, Freedom Tower. Sources