18. Wisconsin Avenue in Chevy Chase, Md. and Washington, D.C.
$90 per square foot
Chevy Chase, which straddles Maryland and the District of Columbia, is also home to premier shopping. Wisconsin Avenue features Saks Fifth Avenue, Jimmy Choo, Gucci, Cartier and Tiffany & Co., among others. The Shops at Wisconsin Place houses Bloomingdale’s and Cole Haan.