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Aon Center (Chicago)
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<p>The Aon Center (200 East <a href="/facts/Randolph_Street_(Chicago)/VLGz1taa">Randolph Street</a>, formerly Amoco Building) is a modern supertall <a href="/facts/Skyscraper/5nM0naVB">skyscraper</a> located in the Northeast corner of the <a href="/facts/Chicago_Loop/sdHwWFFu">Chicago Loop</a>, Chicago, Illinois, United States, designed by architect firms <a href="/facts/Edward_Durell_Stone/J4IeqXMw">Edward Durell Stone</a> and The <a href="/facts/Perkins_and_Will/xXTDpPqE">Perkins and Will</a> partnership, and completed in 1973 as the Standard Oil Building (nicknamed "Big Stan"). With 83 floors and a height of 1,136 feet (346 m), it is the <a href="/facts/List_of_tallest_buildings_in_Chicago/AbaHsbLL">fourth-tallest building in Chicago</a>, surpassed in height by the <a href="/facts/Willis_Tower/0oukJxzA">Willis Tower</a>, <a href="/facts/Trump_International_Hotel_and_Tower_(Chicago)/3bfWvocR">Trump International Hotel and Tower</a>, and <a href="/facts/St._Regis_Chicago/j7rGM363">St. Regis Chicago</a>. </p><p>The building is managed by <a href="/facts/Jones_Lang_LaSalle/2WwgrD8s">Jones Lang LaSalle</a>, which is also headquartered in the building. Aon Center houses the headquarters of <a href="/facts/Aon_(company)/tojY34Ln">Aon</a>, <a href="/facts/Blue_Cross_Blue_Shield_Association/BXhFKwFr">Blue Cross Blue Shield Association</a>, and <a href="/facts/Kraft_Heinz/GNAsQCh8">Kraft Heinz</a> (BCBS and Kraft Heinz each have a second headquarters, located in <a href="/facts/Washington%2c_D.C./enXPK156">Washington D.C.</a> and <a href="/facts/Pittsburgh/42yPHyS0">Pittsburgh</a> respectively); the building formerly served as the world headquarters of <a href="/facts/Amoco/mk3RvM8X">Amoco</a> prior to its merger into <a href="/facts/BP/awvwSJ3x">BP</a>. </p><p>The building was briefly the tallest in Chicago, but was soon surpassed by the <a href="/facts/Willis_Tower/0oukJxzA">Sears Tower</a>. It was the fourth-tallest building in the world at the time of its completion. </p>