The Autorité de la concurrence clears the acquisition of the Géant Casino hypermarket of Saint-Grégoire (Brittany) Rennes, the Autorité, in. Directions to Centre Commercial Grand Quartier (Saint-Grégoire) with public transportation · Bus: 12 14 C4 · Train: K3. . Aquatonic Rennes3 locals recommend. Leclerc SAINT GREGOIRE7 locals recommend. Spadium Saint Grégoire3 locals recommend Rennes 2 and Business School. Géant Casino5 locals recommend. (). Géant Casino Chic and sober apartment in the center of Saint-Gregoire. Nearby. Show all. Located at the northern entrance to Rennes, this site connects two major shopping centres – The Centre Saint-Grégoire and Grand Quartier – at the heart of a. $57 night. Individual Host.