The Elliott-Larsen Building is a state government office in downtown Lansing, Michigan, named after Democratic State Representative Daisy Elliott and Republican State Representative Melvin Larsen, primary sponsors of the Elliott-Larsen Civil Rights Act. It was formerly known as the Lewis Cass Building, named after territorial governor Lewis Cass. It is the Michigan state government's oldest standing office building. The building was added to the National Register of Historic Places as "State Office Building" in 1984.