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
Trump International Hotel and Tower (Chicago) Trump International Hotel and Tower (Chicago) The Trump International Hotel and Tower is a skyscraper condo-hotel in downtown Chicago, Illinois. The building, named after businessman and current U.S. President Donald Trump was designed by architect Adrian Smith of Skidmore, Owings and Merrill. Bovis Lend Lease built the 98-story structure, which reaches a height of including its spire, its roof topping out at . It is next to the main branch of the Chicago River, with a view of the entry to Lake Michigan beyond a series of bridges over the river. The building received publicity when the winner of the