The Security Bank and Trust Company Building, also called the Key System Building, is an office building in Oakland, California. It was constructed in 1911 and listed on the National Register of Historic Places on July 26, 1982. The renaissance Revival and baroque architecture building was designed by Frederick Meyer and Walter Reed. The six-story building as a U-shaped floor giving the upper floors more windows. The building is noted for it use of terracotta. The Security Bank and Trust Company Building has also been the headquarters of Key System, Oakland's public transportation system. Frederick Meyer also designed the San Francisco Bankers Investment Building (1912), Kohler and Chase Building (1909), Physicians Building (1914), Humboldt Bank Building (1906) and the Monadnock Building (1906).

• National Register of Historic Places listings in Alameda County, California