Lewis Cass Building

State Office Building
U.S. National Register of Historic Places
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Location	316 S. Walnut St., Lansing, Michigan
Coordinates	42°43′50″N 84°33′28″W / 42.73056°N 84.55778°W / 42.73056; -84.55778Coordinates: 42°43′50″N 84°33′28″W / 42.73056°N 84.55778°W / 42.73056; -84.55778
Area	2 acres (0.81 ha)
Built	1919 (1919)
Architect	Edwyn Albert Bowd
Architectural style	Classical Revival
NRHP reference #	84001432
Added to NRHP	May 17, 1984

Lewis Cass Building is a state government office in downtown Lansing, Michigan named for territorial governor Lewis Cass. It is Michigan's oldest standing office building, and served as the state office building until the completion of the first part of a new state government complex in 1953. The building is now a six-story U-shaped Classical Revival structure, a seventh story having been removed after a major fire in 1951.

The building was added to the National Register of Historic Places as "State Office Building" in 1984.

State of Michigan government agencies located in Cass Building:

The Lewis Cass Building is getting a first-floor facelift as of early 2009.