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PUERTO PEÑASCO, Mexico — Once, it was enough to be Arizona's beach, a nice wide patch of below-the-border shoreline where college kids could camp out and drink too much.

But now, it wants to be more than a parent's nightmare. In less than a decade, more than three dozen condo towers have risen in this town's Sandy Beach area, surrounded by ever-widening waves of upscale vacation homes. It looks like a cellphone commercial by Samuel Beckett, all these rectangles of steel and glitz erupting at the edge of the barren, sandpaper-flat desert.