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Exterior, House Building Type, Prefab Building Type, and Mid-Century Building Type The only grouping of Frank Lloyd Wright's early American System-Built Homes—built by Arthur Richards and designed with standardized components for mass appeal to moderate-income families—is situated in the Burnham Park neighborhood in Milwaukee, Wisconsin. The four model 7A duplexes, one model B1 bungalow (shown here), and model C3 bungalow were added to the National Register of Historic Places in 1985. [Photo via McNees.org]  Best Photos from A Look at Frank Lloyd Wright's Little-Known Prefabs