With its luxuriously long stretch of white sand lapped by turquoise waters, this barrier island of little more than 15 square miles is an iconic place to live, one of the world’s most famous and most photographed resort cities. South Beach, the glamorous anchor of the city, boasts perhaps the highest density of art deco and midcentury modern buildings of anyplace on earth. Homes on Miami Beach range from high-rises on the beach and Biscayne Bay to an increasing number of newly renovated, human-scale historic condo buildings.