Aon Center is a 62-story, 860 ft (260 m) Modernist office skyscraper at 707 Wilshire Boulevard in downtown Los Angeles, California. Designed by Charles Luckman, site excavation started in late-1970, and the tower was completed in 1973, the rectangular black building with white trim is remarkably slender for a skyscraper in a seismically active area. It is the second tallest building in Los Angeles, the second tallest in California, and the 31st tallest in the United States.