Edificio del Plata, Rationalist building in Buenos Aires, Argentina.

The Edificio del Plata is a rationalist office building occupying the full block bounded by Sarmiento, Teniente General Juan Domingo Perón, Carlos Pellegrini and the Carabelas passage in central Buenos Aires. Its long rectangular facade is a grid of dark recessed rectangular openings set between light-colored vertical piers and horizontal bands, above a base with a dark opening at the lower left. The left part of the facade has vertical strips of blue-grey glazing with dark mullions, while the right part is covered by dense grey metal louver arrays in concrete frames.

The site was a public square from the 18th century and hosted the covered Mercado del Plata from 1856, designed by Charles Henri Pellegrini with Pedro Benoit and built by Enrique Hunt. The market was demolished in 1947, when the Municipality launched a new building by Oscar Crivelli and Jorge Heinzmann; work stopped in 1954 and ran until 1961. The new market opened on 23 December 1962 under intendant Alberto Prebisch.

The building's name comes from the Mercado del Plata, the covered market inaugurated on this site in 1856 and named Del Plata in 1859. Since 2008 its facade has carried large banners, including works by Fabián Burgos, Marcos López and Antonio Seguí, and a 2013 image of Pope Francis.

The building is in the heart of Buenos Aires and easy to reach on foot or by public transport from most central areas. The ground floor bank branch is open to the public, but the upper floors with municipal offices are generally not accessible to visitors.

The building occupies the entire block bounded by Sarmiento, Teniente General Juan Domingo Perón, Carlos Pellegrini and Pasaje Carabelas, not a triangular plot. Since 2008 its facade has carried giant reproductions of artworks, including pieces by Fabián Burgos, Marcos López and Antonio Seguí, and a 2013 image of Pope Francis.