Aon Center

Note: As this project is proposed, the data is based on the most reliable information currently available. Additionally, in response to the COVID-19 global health pandemic, construction work may temporarily slow or suspend under restrictions imposed by local or national authorities. This data is thus subject to change until the building has completed and all information can be confirmed and ratified by the CTBUH.

This project is a renovation and replaced Aon Center (Previous)

Click an image to view larger version.


Height: Architectural 349.9 m / 1,148 ft Estimated
Height: To Tip 362.5 m / 1,189 ft Estimated
Floors Above Ground 84
Floors Below Ground 5
# of Parking Spaces 679


Official Name Aon Center
Other Names Amoco Building, Standard Oil Building
Structure Type Building
Status Proposed
Country United States
City Chicago
Street Address & Map 200 East Randolph Drive
Postal Code 60601
Building Function office
Structural Material steel
Construction Start 2021
Completion 2023
Official Website Aon Center

Companies Involved

Owner/Developer 601 W Companies
Design Solomon Cordwell Buenz
Other Consultant
• Interiors The Hettema Group
• Observatory Legends
• Property Management JLL
• Traffic Kimley Horn
Material Supplier
• Elevator Schindler

About Aon Center

Located in downtown Chicago overlooking Millennium and Grant Parks on the eastern edge of the Loop. The Aon Center is one of the “string of pearl” buildings that stand-out on Chicago’s skyline for their remarkable height. At the time of its completion, the building was only the sixth supertall tower ever constructed. Originally clad in Carrara marble, it was the tallest marble-clad building in the world until it was reclad in white granite due to safety concerns in the early 1990s.

Simple in design, the Aon Center appears monolithic, without any setbacks or adornments. The building’s shape and scale are reminiscent of New York’s original World Trade Center buildings, its architectural contemporaries. Similar to the World Trade Center towers, the Aon Center 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. The columns also house piping and utility lines, eliminating the need for interior column chases that so often deprive buildings of valuable office space. They also serve to emphasize the building’s height and augment its vertical prominence.

Despite the building’s imposing configuration, it is still well-integrated into its urban habitat. The Pedway, a series of underground pedestrian walkways, connects the Aon Center to numerous surrounding buildings throughout the loop. A plaza decorated with fountains and ample seating envelops the tower on all sides and provides an inviting place for pedestrians to congregate on a nice day. Taken together, the Aon Center’s quiet, dignified façade and its simplicity overall, make it a unique and memorable addition to the skyline.

To submit more information or donate images for this project, please use our submission portal.