The Charles Stewart Mott Foundation Building (formerly the Union Industrial Bank Building) is a 16-story office high-rise building in downtown Flint, Michigan. It is the tallest building in the city. Designed by Wirt C. Rowland in 1928 and opened in 1930, it was built as the Union Industrial Bank Building to serve as the headquarters for Union Industrial Bank. Rowland was considered innovative for his use of two materials in the building's construction: Nirosta (a type of stainless steel) for decorative purposes in the public spaces and aluminum for its storefronts and window frames.