One World Trade Center (formerly known as Freedom Tower) is the main building of the new World Trade Center under construction in Lower Manhattan in New York City, USA. The tower will be located in the northwest corner of the 16-acre (65,000 m²) World Trade Center site, bound by Vesey, West, Washington and Fulton streets. Construction on below-ground utility relocations, footings, and foundations for the Freedom Tower began on April 27, 2006. On December 19, 2006, the first steel columns were installed in the building's foundation. Three other high-rise office buildings are planned for the site along Greenwich Street, and they will surround the World Trade Center Memorial, which is under construction. The area will also be home to a museum dedicated to the history of the site.