Aon Center (Chicago) (English Wikipedia)

Cosper, Stephen D.; William H. Hallenbeck; Gary R. Brenniman (January 1993). "Construction and Demolition Waste: Generation, Regulation, Practices, Processing, and Policies" (PDF). University of Illinois at Chicago, Office of Solid Waste Management. p. 31. Archived (PDF) from the original on October 9, 2022. Retrieved March 26, 2010.

millercicero.com

"Trophy Building Sale Sets New Record". Miller Cicero, LLC. October 7, 2003. Archived from the original on May 18, 2007. Retrieved September 25, 2007.

Roeder, David (February 21, 2003). "New owner expected for Aon Center". Chicago Sun-Times. Retrieved September 18, 2008 – via Newsbank.

Nelson, Bryce (May 7, 1973). "Sears 'Topping Out' Puts Chicago On Top". Newspapers.com. Retrieved October 9, 2022.

Cosper, Stephen D.; William H. Hallenbeck; Gary R. Brenniman (January 1993). "Construction and Demolition Waste: Generation, Regulation, Practices, Processing, and Policies" (PDF). University of Illinois at Chicago, Office of Solid Waste Management. p. 31. Archived (PDF) from the original on October 9, 2022. Retrieved March 26, 2010.

"Wells REIT Changes Name to Piedmont Office Realty Trust". Piedmont Office Realty Trust, Inc. Archived from the original on June 10, 2008. Retrieved August 10, 2007.

"The Skyscraper Center: Aon Center". Council on Tall Buildings and Urban Habitat. Archived from the original on August 8, 2014.

McMillan, Greg (June 12, 2007). "Two buildings, two cities, one problem". The Globe and Mail. Toronto. Retrieved September 25, 2007.

"The Skyscraper Center: Aon Center". Council on Tall Buildings and Urban Habitat. Archived from the original on August 8, 2014.
"Aon Center, Chicago". Emporis. Archived from the original on December 7, 2006. Retrieved April 23, 2008.{{cite web}}: CS1 maint: unfit URL (link)
Tadena, Nathalie; Dean, Jason; Scism, Leslie (January 14, 2012). "Aon Shifts Headquarters to London". The Wall Street Journal. Archived from the original on August 31, 2017. Retrieved January 20, 2020.
"Contacts". Amoco. February 12, 1998. Retrieved on March 31, 2010.
"Aon Center". Glass Steel and Stone. Archived from the original on August 26, 2007. Retrieved September 25, 2007.{{cite web}}: CS1 maint: unfit URL (link)
"Trophy Building Sale Sets New Record". Miller Cicero, LLC. October 7, 2003. Archived from the original on May 18, 2007. Retrieved September 25, 2007.
"Wells REIT Changes Name to Piedmont Office Realty Trust". Piedmont Office Realty Trust, Inc. Archived from the original on June 10, 2008. Retrieved August 10, 2007.

Tadena, Nathalie; Dean, Jason; Scism, Leslie (January 14, 2012). "Aon Shifts Headquarters to London". The Wall Street Journal. Archived from the original on August 31, 2017. Retrieved January 20, 2020.