What year were the twin towers built?

Construction begins on March 21 at the WTC site with the demolition of 78 Dey Street. August 1966 ... The North Tower of the WTC exceeds the height of Empire State Building, making it the tallest building in the world. ... On September 24, The Port Authority announces plans to seek a 99-year net lease of the complex. 2000. read more

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. read more

Top of the World Observation Deck opens at Two World Trade Center (South Tower). April 1976 The Windows of the World Restaurant opens at the top of the North Tower on April 19. read more

Ground was broken on August 5, 1966, following six months of demolition and site preparation. The excavation began. The Bathtub and footings and foundations were built in this time. read more

The Bathtub and footings and foundations were built in this time. The North Tower steel began to rise in August 1968 and the South Tower in January 1969. The first tenants moved into the North Tower in December 1970, and into the South Tower in January 1972. read more