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.
The region is bordered by the river Loire, in the west, and by the Franche-ComtÃ© and Champagne regions in the east. To the south it is bordered by the Rhone Alpes region. The Burgundy region is made up of four French departments. Northern Burgundy comprises the department of the Yonne (89), capital Auxerre, a rolling agricultural area bordering on the outer fringes of the Paris region.