UNITED STATES - CIRCA 1971: Aerial view of financial district with new World Trade Centre's Twin Towers (Photo by Henry Groskinsky/Time & Life Pictures/Getty Images). The location of this image is New York, New York United States. Copyright: Time & Life Pictures
The original World Trade Centre was a complex with seven buildings featuring landmark twin towers in Lower Manhattan , New York City , United States . The complex opened on April 4, 1973, and was destroyed in 2001 during the September 11 attacks . The site is being rebuilt with five new skyscrapers and a memorial to the casualties of the attacks . As of November 2011 , only one skyscraper has been completed , with four more expected to be completed before 2020. One World Trade Centre will be the lead building for the new complex and is expected to be finished by 2013. A sixth tower is still awaiting confirmation to be built. At the time of their completion, the original 1 and 2 World Trade Centre, known colloquially as the Twin Towers, were the tallest buildings in the world.
The complex was designed in the early 1960s by Minoru Yamasaki and Associates of Troy, Michigan, and Emery Roth and Sons of New York. The twin 110-story towers used a tube-frame structural design . To gain approval for the project, the Port Authority of New York and New Jersey agreed to take over the Hudson & Manhattan Railroad , which became the Port Authority Trans-Hudson (PATH). Groundbreaking for the World Trade Centre took place on August 5 , 1966. The North Tower (1) was completed in December 1972 and the South Tower (2) was finished in July 1973 . The construction project involved excavating a large amount of material, which was later used as landfill to build Battery Park City on the west side of Lower Manhattan. The cost for the construction was $400 million ($2,300,000,000 in 2012 dollars). The complex was located in the heart of New York City's downtown financial district and contained 13.4 million square feet (1.24 million m2 ) of office space. The Windows on the World restaurant was located on the 106th and 107th floors of 1 World Trade Centre (the North Tower ) while the Top of the World observation deck was located on the 107th floor of 2 World Trade Centre (the South Tower ). Other World Trade Centre buildings included the Marriott World Trade Centre ; 4 World Trade Centre ; 5 World Trade Centre ; 6 World Trade Centre , which housed the United States Customs . All of these buildings were built between 1975 and 1981. The final building constructed was 7 World Trade Centre , which was built in 1985. The second King Kong was filmed in 1976 with some scenes mentioning and showing the World Trade Centre. The World Trade Centre experienced a fire on February 13 , 1975, and a bombing on February 26 , 1993. In 1998, the Port Authority decided to privatize the World Trade Centre, leasing the buildings to a private company to manage, and awarded the lease to Silverstein Properties in July 2001 .
On the morning of September 11, 2001, Al-Qaeda -affiliated hijackers flew two 767 jets into the complex, one into each tower, in a coordinated terrorist attack . After burning for 56 minutes, the South Tower (2) collapsed, followed a half-hour later by the North Tower (1), with the attacks on the World Trade Centre resulting in 2,753 deaths. 7 World Trade Centre collapsed later in the day and the other buildings, although they did not collapse, had to be demolished because they were damaged beyond repair. The process of cleanup and recovery at the World Trade Centre site took eight months. The first new building at the site was 7 World Trade Centre, which opened in May 2006 . The Lower Manhattan Development Corporation (LMDC), established in November 2001 to oversee the rebuilding process, organized competitions to select a site plan and memorial design. Memory Foundations , designed by Daniel Libeskind , was selected as the master plan, but this went through substantial changes in design. The new World Trade Centre complex will include One World Trade Centre , three other high-rise office towers, and the National September 11 Memorial & Museum .
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