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The Aon Center (right) and Two Prudential Plaza (left) in Chicago

The Aon Center in Chicago was completed in 1972. At 1,136 feet (346.3 m) tall, it is second only to the Sears Tower in height in Chicago. When the building was originally built, it was the world's tallest marble clad building. Eventually, the harsh climate caused the building's Carrara marble sheathing to fail and detach from the building. From 1990 to 1992, the entire building was refaced with white granite at a greater expense than the original cost of the whole structure. The building employs a tubular steel-framed structural system with V-shaped perimeter columns to resist earthquakes, reduce sway, minimize column bending, and maximize column-free space.

The Standard Oil Building or "Big Stan" as the building was often called, was known officially as the AmocoAmoco was a United States oil company formed from the dissolution of Standard Oil. It was originally Standard Oil of Indiana, or Stanolind despite the fact that its headquarters was in Chicago, Illinois. Early operations centered on the Whiting, Indiana r Building. After the building was sold, it became known officially as the Aon Center.

In the early 1980sMillennia: 1st millennium 2nd millennium 3rd millennium Centuries: 19th century 20th century 21st century Decades: 1930s 1940s 1950s 1960s 1970s 1980s 1990s 2000s 2010s 2020s 2030s Years: 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 Events and trends, the lightLight is electromagnetic radiation with a wavelength that is visible to the eye, or in a more general sense, any electromagnetic radiation in the range from infrared to ultraviolet. The three basic dimensions of light (and of all electromagnetic radiations in selective offices in the building were turned on to form a huge cross in the ChristmasChristmas (literally, the Mass of Christ) is a traditional holiday in the Christian calendar which takes place on the twenty-fifth day of December and celebrates the nativity of Jesus Christ. Christmas is also celebrated as a secular holiday throughout mu season.

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