One South Dearborn

One South Dearborn is a striking 571 ft (174m) tall skyscraper located in the heart of Chicago, Illinois. Originally, a more ambitious plan for the site included a towering 112-story building. Since its completion, the skyscraper has become a prominent feature of the Chicago skyline and serves as the headquarters for Sidley Austin LLP, a major law firm that relocated here in November 2005 from the nearby Bank One Plaza. This architectural landmark is not only significant for its height but also for its role in the city's business landscape.