assigment 2 (Sears Tower) ;> by a:120731

Sears Tower
Sears Tower was built in downtown Chicago as the headquarters of Sears, Roebuck & Co. It opened in 1974 as the world's tallest building, 1,474 feet, with 110 stories and 4.5 million square feet of office space. The building was designed by architects Skidmore, Owings & Merrill, and constructed in only

thirty months. Engineer Fazlur Khan structured the building as nine square tubes of varying heights, bundled together to resist high winds and a technological innovation that was developed specifically for the mammoth skyscraper. The Sears

Tower has an exterior of black aluminum and bronze-toned glass cut by black bands. The Sears Tower is the fourth tallest building in the world and still the tallest in the United States.

Preceded by	World Trade Center
Surpassed by	Petronas Twin Towers
Information
Location	Chicago, Illinois USA
Status	Complete
Constructed	1970-1974
Height
Antenna/Spire	527 m (1730 ft) [1]
Roof	442 m (1450 ft)
Top floor	435.8 m (1431 ft)
Technical details
Floor count	110
Floor area	4.56 million sq ft. (3.81 million sq ft. rentable) 418,064 m² (353,961 m² rentable)[2]
Elevator count	104, with 16 double-decker elevators