TheFrank W. Thomas House is a historic house located at 210 Forest Avenue inOak Park, a suburb ofChicago inIllinois, United States. The building was designed by architectFrank Lloyd Wright in 1901 and cast in the Wright-developedPrairie School of Architecture. By Wright's own definition, this was the first of the Prairie houses - the rooms are elevated, and there is no basement. The house also includes many of the features which became associated with the style, such as a low roof with broad overhangs,casement windows, built-in shelves and cabinets, ornate leaded glass windows and central hearths/fireplaces.Tallmadge & Watson, a Chicago firm that became part of the Prairie School of Architects, added an addition to the rear of the house in 1923.[2]