Outside Downtown D.C., architectural styles are more varied. Historic buildings are designed primarily in the Queen Anne, Châteauesque, Richardsonian Romanesque, Georgian Revival, Beaux-Arts, and a variety of Victorian styles. Rowhouses are prominent in areas developed after the Civil War and typically follow Federal and late Victorian designs. Georgetown's Old Stone House, built in 1765, is the oldest-standing building in the city. Founded in 1789, Georgetown University features a mix of Romanesque and Gothic Revival architecture. The Ronald Reagan Building is the largest building in the district with a total area of about 3.1million squarefeet (288,000m). Washington Union Station is designed in a combination of architectural styles. Its Great Hall has elaborate gold leaf designs along the ceilings and the hall includes several decorative classical-style statues.