Aon Center (Chicago) the world headquarters of Aon and Amoco. Aon's US operations are still headquartered here. The building is also the co-headquarters of Kraft Heinz. The Standard Oil Building was constructed as the new headquarters of the Standard Oil Company of Indiana, which had previously been housed at South Michigan Avenue and East 9th Street. When it was completed in 1973, it was the tallest building in Chicago and the fourth-tallest in the world, earning it the nickname "Big Stan". (A year later, the Sears Tower took the title as Chicago's and world's tallest.) The building employs a tubular steel-framed structural system
Chase Tower (Chicago) live audience at the Chase Auditorium under the plaza. Design architects for the construction were C.F. Murphy Associates, Stanislaw Z. Gladych and Perkins and Will. Chase Tower is known for both its distinctive curving shape and its vibrant public space: a deep sunken plaza at the geographic center of the Chicago Loop, complete with a jet fountain and Marc Chagall's ceramic wall mural "Four Seasons". The ground floor is home to the largest Chase Bank branch in Chicago with 22 ATMs. Chase Tower (Chicago) Chase Tower, located in the Chicago Loop area of Chicago, in the U.S. state of Illinois