Museum: Dumbarton Oaks
Location: Washington, DC
Architect: ? (original private house), many (additions and enlargements)
Completed: circa 1801 (original private house), many additions and enlargements from that period until 2008, 1940 (conversion to a research institute open to the public)
Museum: Art Museum of the Americas
Location: Washington, DC
Architect: Paul Cret
Completed: 1912 (as residence of the OAS Secretary General), 1976 (as museum)