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
Glenbard West High School style of a castle, complete with roof turrets. Glenbard, as it was originally named, was constructed in 1922 atop Honeysuckle Hill, overlooking Lake Ellyn. Built with dark red brick, the building was built with castle-like design, complete with a turret and other minor castle details. Glenbard West also has a tower known as the sixth floor. From the window of the sixth floor tower, the Willis (formerly Sears) Tower in downtown Chicago can be seen on a clear day. Athletics were initially played in a gymnasium, built in 1936, in the school building itself, but with the construction of a