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
Tower Building, Liverpool Tower Building, Liverpool Tower Buildings is a former office block in the city of Liverpool, Merseyside, England. It stands with its longer front on the east side of the Strand, and extends round the corner into Water Street. The building is located directly opposite the Royal Liver Building, which was designed by the same architect. Earlier buildings on the site have been a sandstone mansion, and a later fortified house known as the Tower of Liverpool. After this was demolished in 1819, it was replaced in 1846 by the first structure to be named Tower Buildings. The present structure is