One South Dearborn, Glass office tower in Loop District, Chicago, US
One South Dearborn is an office tower with 39 floors and a modern green glass exterior located in downtown Chicago. The building contains extensive office space with a white marble lobby and efficient vertical circulation through multiple elevators.
The building opened in 2005 and replaced earlier proposals for a much taller structure on the same site. The shift toward a smaller-scale development reflected broader changes in how Chicago was approaching new commercial construction.
The structure houses the headquarters of Sidley Austin law firm, reinforcing Chicago's position as a center for legal services in North America.
The tower sits in the heart of downtown and is easily accessible by public transit and walkable from surrounding streets. The location provides convenient access to nearby shops, restaurants, and other urban services throughout the district.
The building earned Illinois' first LEED-CS precertification for its environmental systems and resource management practices. This recognition highlighted the project's commitment to sustainable engineering from its initial design phase.
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