The are a immediately north of the Ben Youssef Mosque is cut by two main streets : Rue Assouel (which leads up to Bab El Khemis) and Bab Taghzout, which runs up to the gate of the same name and to the Zaouia of Sidi Bel Abbes. These were, with Bab Doukkala, the principal approaches to the city of Marrakech until the present century and along them you find many of the old fondouks used for storage and lodging by merchants visiting the souks.
One of these fondouks is sited just south of the mosque and a whole series can be fond along Rue Amesfah - the continuation of Baroudienne - to the north and west.
Most are still used in some commercial capacity, as workshops or warehouses, and the doors to their courtyards often stand open. Some date from Saadian times and have fine details of wood carving or stuccowork. If you are interested, nobody seems to mind if you wander in.