I came across this house on the narrow rue Blanche in the 9th district. It belonged to Théodore Ballu, architect of Paris's City Hall (the Hôtel de Ville, a rather wedding-cake-y building whose exterior walls hold statues of a dazzling number of famous parisians).
Looking down the street from the house, one doesn't see too much.
But walk this way for a few minutes, and...