This marvelous house is classified since 1989 as a Monumento Histórico Nacional, and, as so, I presume it should be under the protection of the argentinian law (!?)
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Another very sad example of the argentinian laissez-faire, is the former Club Ariston (also in Mar del Plata), by Marcel Breuer, Eduardo Catalano and Francisco Coire.
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Here you can find the rest of the (sad) story.