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Ground Zero by T.J. Hudson5/27/2023 ![]() But antennas are not counted in a skyscraper’s height measurement as they are not internationally accepted as an architectural component of buildings. ![]() But 1 WTC loses its tallest skyscraper ranking to Chicago's 443-meter Sears Tower in 1974.ġ WTC's unique features include its 106th and 107th floor restaurant spaces known as Windows on the World, which open on April 19, 1976, and become popular tourist attractions.Ī 110-meter telecom antenna is installed on 1 WTC’s roof in 1979, soaring to a height of 527 meters. It officially opens for business on April 4, 1973. When 1 WTC is completed in 1972, it becomes the world's tallest building at 417 meters, overtaking New York's Empire State Building. The towers are located on what used to be “Radio Row,” a Lower Manhattan area known for its consumer electronics stores.Ĭonstruction begins with an August 5, 1966, groundbreaking and uses an innovative technique in which each tower’s main structure is built as a square-shaped hollow tube of closely spaced steel perimeter columns, connected to the tower’s central steel core by floor trusses. ![]() It is one of two twin towers designed by American architect Minoru Yamasaki and built by the Port Authority of New York and New Jersey, a joint governmental agency of the two states. One World Trade Center (left) is topped off at 110 floors in 1970 and its first tenants move in. Credit: Library of Congress, Prints & Photographs Division, Balthazar Korab Collection 1976 ![]()
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