Stock Photo - USA, IL, Chicago. The Aon Center (formerly the Standard Oil Building), 83 storey office tower in the Loop District. Jay Pritzker Pavillion, designed by architect Frank Gehry in Millennium Park, visible at the base.

Stock Photo: USA, IL, Chicago. The Aon Center (formerly the Standard Oil Building), 83 storey office tower in the Loop District. Jay Pritzker Pavillion.

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