Unit 4 was an attic/ store. In the first half of the twentieth century the north side of Unit 4 downstairs was one large space containing a small room housing twin sit down toilets (!) and a staircase to the upstairs, undivided except for a small room in the south east corner. Unit 4 also contained a deep well in the north east corner. The upstairs of Unit 4 was used to form a restaurant from 1961 and a grand medieval fireplace purchased from a ruined chateau and renovated in Rue du Couvent was added. The windows to the restaurant were enlarged in 1975. In 1989 the north side of Unit 4 downstairs was converted to become the Hotel reception with guests entering from the west side to check in and departing from the east side to access the hotel bedrooms.
Les Remparts changed hands in 1956 and the new owners started a restaurant and a patisserie, making significant changes to the interior and exterior of Les Remparts on the back of a successful enterprise. They created parking for the thriving restaurant in 1974 by agreeing with the Mayor that all waste material from the introduction of a telephone system to Gensac would be dumped in the front garden to form a mound; this partially concealed the walls of the remparts. They opened up walls into Unit 4 from Unit 3, wall M8, to move the kitchen for the Maison de Maître and this space was subsequently converted into a patisserie. They made a large opening into Unit 4 from Unit 2, wall M5, to allow for access to what would become the restaurant kitchen and patisserie kitchen. Previously the downstairs of Unit 2 had been use to accommodate workers and was only accessible from the entrance in Rue du Couvent. They made a small door through from the western side of Unit 2 (downstairs) into a toilet in the hall of Unit 3, enabling access to the Hall by virtue of the Hall having access to the same toilet located under the staircase.