By the northern ring road:
Drive to Porte Maillot, Avenue Friedland, Place de Saint Augustin, Boulevard Malesherbes, then turn right into Rue des Mathurins and left into Rue Astorg.
By the southern ring road:
Drive to Porte de Bercy, towards the centre of Paris, Place de la Madeleine, Boulevard Malesherbes, then Rue des Mathurins and Rue Astorg.