The most expensive residential streets in Paris in 2018 by average price per square metre were Avenue Montaigne (8th arrondissement), at 22,372 euros per square metre; Place Dauphine (1st arrondissement; 20,373 euros) and the Rue de Furstemberg (6th arrondissement) at 18,839 euros per square metre. The total number of residences in the City of Paris in 2011 was , up from a former high of  in 2006. Among these,  (85.9 percent) were main residences,  (6.8 percent) were secondary residences, and the remaining 7.3 percent were empty (down from 9.2 percent in 2006).