Outside downtown Washington, architectural styles are even 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 especially prominent in areas developed after the Civil War and typically follow Federalist and late Victorian designs. Georgetown's Old Stone House was built in 1765, making it the oldest-standing original 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 approximately 3.1 million square feet (288,000 m2).