電気自動車
The Foster House was originally designed as a garage, with an apartment above for the chauffeur and his family. In 1929 the Martins owned a Pierce-Arrow touring car as well as a Detroit Electric car. After their first summer in residence, the Martins asked Wright to alter and expand the building. Once complete, the Martins' daughter Dorothy, together with her husband James Foster and their children Margaret and Darwin Martin Foster, spent many happy summers in residence. Like the Martin House, the Foster House has strong horizontal lines echoing the lake beyond, cantilevered balconies, and numerous windows.