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Official Name

James R. Thompson Center (State of Illinois Building)


100 W. Randolph St.

Completion Date




Use Type


When you first encounter the Thompson Center, you might wonder if a UFO has landed in the middle of the Loop.

The Helmut Jahn-designed center of state government is unabashedly Postmodern, with colorful details and a shape that references the dome of the state's capitol. In addition to making a bold first impression, its design is intended to communicate a message. The openness and transparency of the building are meant to symbolize the state’s commitment to serving the people.

Consolidating Government

In the ’70s and ’80s, the North Loop Renewal Plan sought to reverse decades of decline in the area. They took the opportunity to consolidate 50 different state of Illinois agency offices into one new building. Joining three other major government buildings standing within a city block of each other, the Thompson Center was to be a “peoples’ center,” an easily accessible and inviting place to do business with the state of Illinois—as well as shop and dine.

A Postmodern Dome

Tall, gridded walls face LaSalle and Lake streets, but on the other sides of the building, Jahn broke from the rigid straight lines of modernism. Hearkening back to the grand domes of earlier government structures, such as the state capitol in Springfield, the southeast profile of the Thompson Center is a slice of a hollow sphere, clad in curved blue glass and salmon-colored steel.

The populist Postmodernism continues inside. An enormous skylit rotunda, 160 feet in diameter and 13 stories high, is lined with balconies of open office space. A circular cutout in the floor, 72 feet in diameter, opens onto a large food court, a Department of Motor Vehicles office and corridors leading to nearby buildings. A steady flow of people move around on escalators and exposed elevators, enlivening the space.

Keeping Cool

The Thompson Center bears some resemblance to a massive greenhouse, so keeping it cool is a challenge. An innovative system of thermal storage helps. Chillers create ice slush overnight, when electricity prices are low, and store the slush in basement tanks. The slush is used to air condition the building during the day and is then re-frozen at night.