when was the twin towers built in new york
World Trade Center (1973–2001) The original World Trade Center was a large complex of seven buildings in Lower Manhattan, New York City, United States. It featured the landmark twin towers, which opened on April 4, 1973, and were destroyed as a result of the September 11 attacks in 2001. At the time of their completion, the "Twin Towers"—the original 1 World Trade Center, at 1,368 feet (417 m); and 2 World Trade Center, at 1,362 feet (415.1 m)—were the tallest buildings in the world. The other buildings in the complex included the Marriott World Trade Center (3 WTC), 4 WTC, 5 WTC, 6 WTC, and 7 WTC. All these buildings were built between 1975 and 1985, with a construction cost of $400 million ($2,300,000,000 in 2014 dollars).[4] The complex was located in New York City's Financial District and contained 13,400,000 square feet (1,240,000 m2) of office space.[5][6]
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]