Aon Center, Office skyscraper in Downtown Los Angeles, United States.
Aon Center is a modern office tower in Downtown Los Angeles with a rectangular silhouette clad in bronze and accented with white trim. The structure rises 262 meters across 62 floors above ground, with additional basement levels housing the building's infrastructure and services.
Excavation began in late 1970 and the tower was completed in 1973 as the United California Bank Building, designed by Charles Luckman. It was then the tallest building in the world outside New York and Chicago, and remained the tallest west of the Mississippi until Houston's Texas Commerce Tower surpassed it in 1982. Renamed First Interstate Tower in 1981, it stayed Los Angeles's tallest until the 1989 completion of Library Tower, now U.S. Bank Tower.
The tower carried three successive names tied to its main tenants: United California Bank Building from 1973 to 1981, then First Interstate Tower, and later Aon Center after the Aon Corporation, whose red logo sits at the top. During the 1984 Summer Olympics, the Olympic logo appeared on the north and south sides of the crown because First Interstate Bank sponsored the games.
The building features 30 elevators for efficient vertical movement between its many floors. As an office tower, access is generally during business hours and typically requires business purposes or prior arrangement.
A major fire in 1988 prompted Los Angeles to establish stricter building codes requiring sprinkler systems in all high-rises. This disaster became a turning point for safety standards in the city's skyline.
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