The Clarence Sondern House in Kansas City, Missouri, designed by Frank Lloyd Wright, is an important example of his Usonian vision of modest modern housing for American family life. Commissioned in 1939 and built in 1940, it began as a compact single-story home with a flat roof, long overhangs, glass walls, and a carport arranged on a four-foot grid. Under second owner Arnold Adler, Wright designed a major 1948 addition that greatly enlarged the house while continuing its original materials and style. The project was also notable as the first house supervised in construction by Taliesin Fellowship member John H. “Jack” Howe.