One World Trade Center is the primary building of the new World Trade Center complex in New York City's Lower Manhattan and is the tallest building in the United States and Western Hemisphere. The 104-story supertall skyscraper 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.