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Palacio Barolo is a landmark office building, located at 1370 Avenida de Mayo, in the neighborhood of Montserrat, Buenos Aires, Argentina. It stood as Buenos Aires' tallest building for more than a decade until the construction of the Kavanagh Building in 1936. Its twin brother, Palacio Salvo, is a building designed and erected in Eclectic style, built by the same architect in Montevideo.