The Barolo Palace (also called Barolo Passage or Barolo Gallery) is an office building located on Avenida de Mayo, in the Monserrat neighborhood of Buenos Aires, Argentina . It was designed by the Italian Mario Palanti and inaugurated in 1923. Until the 1930s, it was the tallest building in the city and in South America, as was its 'twin', the Salvo Palace, built by the same architect in Montevideo.