In the Cour du Commerce Saint André, a tower of the wall is visible inside the Maison de la Catralogne, on the corner of the Cour de l'hôtel de Rohan. The tower is inhabited by an individual, the entrance is in the Cour de l'hôtel de Rohan where the inside part is hidden by two perpendicular stoneworks

The tower on the ground-floor and at its joint with the first floor

Here are some pictures taken by A. Gillette, in the early 90s, when the maison de la Catalogne was having some works done, resulting in the present aspect. On the right picture you can see the inner tower and on the left a staircase, now hidden. The bottom wall of the shop is likely to be as high as the right partiion of the staircase. The latter probably leads to a flat inside the tower whose windows open on the cour de l'hôtel de Rohan.