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.
Roman Catholic Archdiocese of Sens. The Roman Catholic Archdiocese of Sens and Auxerre (Latin: Archidioecesis Senonensis et Antissiodorensis; French: ArchidiocÃ¨se de Sens et Auxerre) is a Latin Rite Archdiocese of the Roman Catholic church in France. The Archdiocese comprises the department of Yonne, in the region of Bourgogne.