So the hope on East 78th Street is to sell the well-preserved houses on a quiet residential block off Lexington Avenue to a family or a developer looking to create a single 25-wide mansion by breaking through the wall between the houses.

WSJ: Side by Side Homes on Upper East Side Go on Market Together for $11.95 Million

Artists have painted wall murals in the rooms and hallways, and the 1850s mansion is a surreal backdrop.

BBC: Mini Guide to Buenos Aires, Argentina