Mar del Plata, 1946, by Amancio Williams(click to enlarge) .
This marvelous house has been classified since 1989 as a Monumento Histórico Nacional, and, as so, I presume it should be under the protection of 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.