This little beauty is a down-pipe. Have a look in the next two images. See beside the door there? A pipe. A pipe that drains water from the roof. Isn't it just the most decadent thing you have ever seen?
The Hotel de Lauzan is on the Ile St Louis, on the Rive Droit side, Quai d'Anjou. There is an absolutely rolicking historical (duh!!) account of this wonderful building in my parisien bible, Edmund White's 'The Flaneur" on pp 123 - 135. As he details, 'The history of the house involves a series of fascinating disasters.' It also involves Baudelaire, high priest to us lower-flaneurs.