One South Dearborn is a 571 ft (174m) tall skyscraper in Chicago, Illinois. An earlier proposal for the same site proposed a much taller 112-story building. The current anchor tenant is Sidley Austin LLP, which moved into One South Dearborn in November 2005 from Bank One Plaza.^[1]

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One South Dearborn
One South Dearborn (left) is located directly north of the Inland Steel Building (right)
General information
Type	Office
Location	1 S. Dearborn St. Chicago, Illinois United States
Coordinates	41°52′54″N 87°37′43″W
Current tenants	Sidley Austin LLP
Construction started	2003
Completed	2005
Height
Roof	571 ft (174 m)
Top floor	502 ft (153 m)
Technical details
Floor count	39
Floor area	249,326 m2 (2,683,720 sq ft)
Lifts/elevators	19
Design and construction
Architect(s)	DeStefano Keating Partners
Developer	Hines
Structural engineer	Halvorson and Partners
Main contractor	Turner Construction Company

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