Rowhouses on the 1400 block of Potomac Avenue SE in the Barney Circle neighborhood in Washington, D.C., in the United States. The neighborhood was developed between 1919 and 1921 to accommodate a sudden influx of defense workers in during World War I. The homes are primarily two-story brick rowhouses with mansard roofs and dormers, with open-air front porches. Most of the homes are set back from the street at a uniform distance, and have a front yard. The houses tend to wide and shallow, unlike rowhouses elsewhere on Capitol Hill (which are narrow and deep). This type of rowhouse is known as a "daylight rowhouse", and was developed in the early 20th century to permit maximum daytime lighting of all rooms as a means of reducing electricity use for lighting.