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By the mid-19th century, city officials decided to expand Madrid beyond the 1625 wall erected by Felipe IV. The result was a handful of new, well-laid-out neighborhoods. Salamanca became a home to the working classes, though today it draws a more mixed crowd and houses most of the city's expensive restaurants and shops. The Retiro holds the city's best-known park. The area between the western side of the park and the Paseo del Prado showcases some of the city's most exclusive, expensive, and sought-after real estate.