Early-twentieth-century American vernacular style that produced large numbers of modest two-story homes throughout American suburbs from roughly 1895 through 1930. The SGV inventory is significant, particularly in the older neighborhoods of Pasadena, South Pasadena, Sierra Madre, and Monrovia. The Foursquare overlaps with the Craftsman in some examples, sharing interior detailing including built-ins, wood paneling, and beamed ceilings, and is often mistaken at first glance for Colonial Revival before closer inspection reveals the boxier proportions and the full-width porch.