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.
Burgundy: CÃ´te-d'Or, SaÃ´ne-et-Loire, and southern half of Yonne. This corresponds to the old duchy of Burgundy (later called province of Burgundy). However, the old county of Burgundy (later called province of Franche-ComtÃ©) is not included inside the Burgundy region, but it makes up the Franche-ComtÃ© region.