when did construction start on the world trade center
Construction of the World Trade Center Construction of the World Trade Center's North Tower began in August 1968, and the South Tower in 1969. Extensive use of prefabricated components helped to speed up the construction process. The first tenants moved into the North Tower in December 1970 and into the South Tower in January 1972. Four other low-level buildings were constructed as part of the World Trade Center in the 1970s, and the seventh building, 7 World Trade Center, was constructed in the mid-1980s.
National World War II Memorial Ground was broken in September 2001. The construction was managed by the General Services Administration.
World Trade Center (1973–2001) The cleanup and recovery process at the World Trade Center site took eight months, during which the remains of the other buildings were demolished. The World Trade Center complex was rebuilt over more than a decade. The site is being rebuilt with six new skyscrapers, while a memorial to those killed in the attacks and a new rapid transit hub have both opened. One World Trade Center, the tallest building in the United States, is the lead building for the new complex, reaching more than 100 stories upon completion in November 2014.
World Trade Center (1973–2001) In January 1967, the Port Authority awarded $74 million in contracts to various steel suppliers.[56] Construction work began on the North Tower in August 1968, and construction on the South Tower was under way by January 1969.[57] The original Hudson Tubes, which carried PATH trains into Hudson Terminal, remained in service during the construction process until 1971, when a new station opened.[58] The topping out ceremony of 1 WTC (North Tower) took place on December 23, 1970, while 2 WTC's ceremony (South Tower) occurred later on July 19, 1971.[57] The first tenants moved into the North Tower on December 15, 1970,[1] while the South Tower started accepting tenants in January 1972.[59] When the World Trade Center twin towers were completed, the total costs to the Port Authority had reached $900 million.[60] The ribbon cutting ceremony was on April 4, 1973.[61]