|One AT&T Center|
|Former names||One Bell Center
Southwestern Bell Telephone Building
|Location||909 Chestnut Street
St. Louis, Missouri
|Owner||Inland Real Estate Group|
|Roof||179 m (587 ft)|
|Floor area||1,400,000 sq ft (130,000 m2)|
|Design and construction|
|Architect||Hellmuth, Obata & Kassabaum|
One AT&T Center (formerly One SBC Center and One Bell Center) is a 44-story building in downtown St. Louis, Missouri at 909 Chestnut Street on the Gateway Mall. It is Missouri's largest building by area with 1,400,000 square feet (130,000 m2). The building is leased entirely by AT&T, except for some small retail locations in the lobby.
The building was built to replace the Southwestern Bell Building as the Southwestern Bell world headquarters. However, in a series of mergers the headquarters moved to San Antonio, Texas and was later renamed AT&T.
At one point, 4,800 AT&T employees worked in the building but that number has dropped through layoffs, outsourcing and telecommuting to approximately 2,000. In September 2013, AT&T announced they would vacate the building over the next 12 months, although their lease on the building runs through 2017.