sentences:  The Gabled Ell plan, which became popular following the Civil War, is the most common vernacular type in the district; it features an asymmetrical "L" or "T" shaped plan with a gable roof.Around the 1890s, I-houses and a pyramidal cottage house were built; the former is a two-story plan popular in the rural Midwest at the time, while the latter is a typical Southern design with a distinctive pyramidal hip roof.The bungalow and Foursquare types became popular in the district in the early 20th century, often in conjunction with American Craftsman elements.