![]() In 1985, inspection found numerous cracks and bowing in the marble cladding of the building. On December 25, 1973, during construction a 350-pound marble slab detached from the façade and penetrated the roof of the nearby Prudential Center. The marble used was thinner than previously attempted in cladding a building, which soon proved to be a mistake. When completed, it was the world's tallest marble-clad building, sheathed entirely with 43,000 slabs of Italian Carrara marble. Refacing Aon Center in the 1990s during its refacing, with temporary work elevators erected in the building's corners This construction method was also used for the original World Trade Center twin towers in New York City. The building employs a tubular steel-framed structural system with V-shaped perimeter columns to resist earthquakes, reduce sway, minimize column bending, and maximize column-free space. Originally clad in marble, the Aon Center was also the tallest marble-clad building in the world. When the Aon Center opened as the fourth-tallest completed building in the world, it was only exceeded in height by the twin towers of the original World Trade Center and the Empire State Building in New York City. However, the Sears Tower had already been topped out in May 1973. In 1974, the taller Sears Tower (now Willis Tower) in Chicago surpassed it as the tallest completed building in Chicago (the Sears Tower was also the tallest in the world). When the new Standard Oil Building was completed in 1973, it was the tallest completed building in Chicago and the fourth-tallest in the world, earning it the nickname "Big Stan". This building was constructed in 1911 by the Karpen Brothers Furniture Company and was purchased by Standard in 1927. The Standard Oil Building was constructed as the headquarters of the Standard Oil Company of Indiana. History Construction View from Buckingham Fountain of the building while it was under-construction It was the fourth-tallest building in the world at the time of its completion. The building was briefly the tallest in Chicago, but was soon surpassed by the Sears Tower (now known as the Willis Tower). Aon Center also houses the headquarters of Aon and one of Kraft Heinz's two headquarters (the other being in Pittsburgh), and the former world headquarters of Amoco prior to its merger into BP. The building is managed by Jones Lang LaSalle, which is also headquartered in the building. With 83 floors and a height of 1,136 feet (346 m), it is the fourth-tallest building in Chicago, surpassed in height by Willis Tower, Trump International Hotel and Tower, and St Regis Chicago. The Aon Center (200 East Randolph Street, formerly Amoco Building) is a modern supertall skyscraper east of the Chicago Loop, Chicago, Illinois, United States, designed by architect firms Edward Durell Stone and The Perkins and Will partnership, and completed in 1973 as the Standard Oil Building (nicknamed "Big Stan").
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