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About SBC Michigan Headquarters
The AT&T Michigan Headquarters is a complex of buildings located at 1st Street, Cass Avenue, State Street, and Michigan Avenue in Detroit, Michigan, United States. It contains the AT&T Building, the AT&T Building addition, and the Maintenance Shop. The AT&T Building (formerly known as the SBC Building) in downtown Detroit is a high-rise, built in 1912 and expanded in 1927. It is located at 1365 Cass Avenue, and occupies the building block bordered by 1st Street, Cass Avenue, State Street, and Michigan Avenue. The AT&T Building stands 19 stories tall. It was originally 7 stories, but was expanded by another 12 in 1927. The high-rise building is used as the Michigan headquarters for communications giant AT&T. It is designed in the Art Deco and Art moderne architectural styles, using brick and limestone as its main materials. Smith Hinchman & Grylls were the architects for the original 7 story building (Pontiac Construction) and for the 12 additional floors added in 1927 (H. G. Christman-Burke Company). The building is a part of the AT&T Michigan Headquarters complex of buildings, along with the AT&T Building addition and the Maintenance Shop.