The Willis Tower, formerly and still commonly referred to as the Sears Tower, is a 110-story, 1,451-foot (442.3 m) skyscraper in the Loop community area of Chicago in Illinois, United States.

The Sears Tower has a black anodized aluminum exterior with tinted glass in bronze black lines vertically tours that highlight the tubes. The large windows offer a maximum use of natural light and views, reinforced by the decline of the modules created on all sides of the tower.

"Sears Tower was the last supertall building constructed during the International architecture period, and SOM's interpretation of the style is remarkably bold and awe-inspiring." The highest skyscraper that uses only steel structure. Others use composite construction material (concrete and …

For nearly 25 years after its completion, the Willis Tower, formerly known as the Sears Tower, held the title of tallest building in the world. Standing 110 stories tall, its black aluminum and bronze-tinted glass exterior has become emblematic …

The basic structure developed for this program of the tower consists of nine 75-foot-by-75-foot column-free square tubes at the base, forming a cellular-tube frame. Floor sizes were reduced by eliminating 75-foot-by-75-foot increments at varying levels.

Jan 29, 2025 · Standing tall in the heart of Chicago, Willis Tower, formerly known as the Sears Tower, is an iconic example of modern architecture. The 110-story skyscraper held the title of the world’s tallest building for nearly 25 years after its completion in 1973.

Aug 5, 2018 · What is the Sears Tower? -- Building history -- Big ideas -- Profile : Bruce Graham, architect -- Science behind the building -- Science and technology -- Computer-aided design -- Eye on design -- Measuring the Sears Tower -- Environmental viewpoint -- -- Construction careers -- Notable structures -- Interesting skyscrapers and other tall ...

Jun 1, 2010 · Towering over the windy city of Chicago, the Willis Tower (formerly known as Sears Tower) was once the tallest building in the world upon its completion in 1973.

The Sears Tower contains enough concrete to build an eight-lane, five-mile-long highway, enough steel to build 50,000 automobiles, and enough telephone wiring to wrap around the world 1.75...

The document summarizes key details about the Sears Tower in Chicago, including its construction history and structural system. It was built between 1970-1974, stands 110 stories tall at 1450 feet, and was the tallest building in the world for over two decades.