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"The south also exists," quip residents of bohemian neighborhoods like San Telmo and La Boca, which historically played second fiddle to posher northern barrios. No more. The hottest designers have boutiques here, new restaurants are booked out, an art district is burgeoning, and property prices are soaring. The south is also the linchpin of the city's tango revival, appropriate given that the dance was born in these quarters.