GRAMMAR'S RESPONSE. The word premises is always plural, whether you're referring to the whole of the land and the buildings upon it or just part of the mall (or whatever). So you want are, always. Authority: Merriam-Webster's Collegiate Dictionary, Electronic Edition, Version 1.5.
Yonne is a department in the centre of France, in the Burgundy region. The largest city in the department, and its prefecture (capital), is Auxerre.
18 regions (regions, singular - region); Auvergne-Rhone-Alpes, Bourgogne-Franche-Comte (Burgundy-Free County), Bretagne (Brittany), Centre-Val de Loire (Center-Loire Valley), Corse (Corsica), Grand Est (Grand East), Guadeloupe, Guyane (French Guiana), Hauts-de-France (Upper France), Ile-de-France, Martinique, Mayotte, Normandie (Normandy), Nouvelle-Aquitaine (New Aquitaine), Occitanie (Occitania), Pays de la Loire (Lands of the Loire), Provence-Alpes-Cote d'Azur, Reunion