Uruguayan architect Roman Fresnedo Siri‘s design for the Pan American Health Organization in Washington DC  won an international competition and was built in 1965. It’s as close to Corbusian modernism as you can find in DC, with the brise soleil and pilotis. The building is at the corner of 23rd and Virginia in Foggy Bottom , set back from the sidewalk by several meters.

Siri also designed the horse racing stadium Hipodromo do Cristal in Brazil in 1951.

Photo from Panoramio.

Nearby in Foggy Bottom, concrete apartment high-rises dominate. Most of them have rusted balconies.