Willis Tower


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Willis Tower,

formerly the

Sears Tower,

Chicago, the second tallest building in the United States. Until the completion of the 1,483-ft (452-m) Petronas TowersPetronas Towers,
twin skyscrapers in Kuala Lumpur, Malaysia, that are the world's tallest twin towers. Standing 1,483 ft (452 m) high, they were designed by the Argentinian-American architect César Pelli.
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 (1998) in Kuala Lumpur, Malaysia, it was the world's tallest building. Constructed from 1970 to 1974 for Sears, Roebuck & Co., it rises to a height of 1,451 ft (442 m) and has 108 floors as well as a 278-ft (85-m) television antenna. Designed by the firm of Skidmore, Owings and Merrill, the building is supported structurally by square tubes of welded steel with floors suspended within the tubes, a technological innovation that was developed specifically for the mammoth skyscraperskyscraper,
modern building of great height, constructed on a steel skeleton. The form originated in the United States. Development of the Form

Many mechanical and structural developments in the last quarter of the 19th cent. contributed to its evolution.
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 by architectural engineer Fazlur Kahn. The tower has an exterior of black aluminum and bronze-toned glass cut by black bands. It was renamed in 2009.
References in periodicals archive ?
The Willis Tower was the tallest building in the world for 25 years.
Chicago's Willis Tower, formerly known as the Sears Tower, has officially been surpassed as the tallest building in the USA by the 1 World Trade Center in New York, right - which is also now the tallest building in the western hemisphere
Well-known for climbing unassisted, the 50-year-old has conquered more then 85 giant structures, including the Empire State Building, Chicago's Willis Tower and the Petronas Towers in Kuala Lumpur.
headquarters is located in the iconic Willis Tower in Chicago.
Well-known for climbing unassisted, the Frenchman has conquered more than 70 skyscrapers, including the Empire State Building, Chicago's Willis Tower, and the Petronas Towers in Kuala Lumpur.
in London include: 2, Gresham Street and the Willis Tower both in the City of London, 150 Cheapside next to St Pauls Cathedral and London Bridge
All that stood between me and a fall to certain death from the 'skydeck' of Chicago's Willis Tower - until 1997 the tallest building in the world - was the transparent material beneath my feet.
All that stood between me and a fall from the skydeck of Chicago's Willis Tower - until 1997 the tallest building in the world - was the transparent material beneath my feet.
One of the tallest buildings - in fact it was the world's tallest for 24 years - is Willis Tower (which used to be called the Sears Tower).
Merchandise Mart Plaza and the Willis Tower at 333 S.
and the Willis Tower in Chicago Office buildings in strong U.
Robert, 48, has scaled more than 70 skyscrapers, including New York's Empire State Building and Chicago's Willis Tower in the United States, and the Petronas Towers in Kuala Lumpur, Malaysia.