[3] The Palacio de Correos was declared National Heritage in 1997 due to its architectural style, historical relevance and the artworks inside the building.

It ceased activities as a post office in 2002 and two years later the National Government called a tender to turn the building into a cultural centre as part of the celebrations to commemorate the 200th anniversary of May Revolution.

Once the project received approval from the president Miguel Juárez Celman, Maillart started works in 1889 on land given by the society Las Catalinas, sited on the block among Leandro N. Alem Ave., Corrientes Ave., Bouchard and Sarmiento streets.

Many years had passed and the original project by Maillart involved a smaller building became obsolete due to the increasing demand for postal services.

The National Direction of Architecture appointed Maillart's main collaborator, Russian Jacques Spolsky to continue the project.

Due to the land having been reclaimed from the Río de la Plata, it was necessary to sink 2,882 10 m (33 ft) concrete piles to avoid problems with the foundations.

The building was finally inaugurated on September 28, 1928, two weeks before then president of Argentina Marcelo T. de Alvear finished his term.