Dougall House: Built in 1854, this residence reflects the design principles of Andrew Jackson Downing.
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Andrew Jackson Downing, who is among the most influential figures of 19th century American design, wrote in 1850 of the need for truth in domestic architecture. He wrote that a country home reflect its function, location, and owner. Built four years later on the edge of Georgetown Heights and designed by Adams & Haskins, the Dougall House exquisitely expressed Downing's precepts. And as Georgetown evolved and tastes in architecture changed, so did the Dougall House. The residence has a mansard roof with dormers — illustrative of the Second Empire style, a popular design choice of the mid-to-late 19th century.
DC Inventory: November 8, 1964 (Joint Committee on Landmarks)
Within Georgetown Historic District
Files

Closer view of the south elevation - Dougal House, 3259 R Street, Northwest, Washington, District of Columbia, DC
Source: Library of Congress Prints and Photographs Division Washington, D.C. 20540 USA
View of the east elevation looking from the southeast (Duplicate color view of HABS DC-837-5) - Dougal House, 3259 R Street, Northwest, Washington, District of Columbia, DC
Source: Library of Congress Prints and Photographs Division Washington, D.C. 20540 USA | Date: 2000