In 1957, Breuer designed the headquarters of the oil drum manufacturer Van Leer Vatenfabrieken in Amstelveen outside Amsterdam. The project consisted of a two–storey double y-shaped office building and a low canteen reached by a long corridor. The steel-frame office building featured glass curtain walls with projecting sunshades and travertine clad end walls. A folded concrete roof similar to that covering the canteen covered the connector between the wings of the office building. Ramps allowed vehicles to approach the off-center canopied concrete entrance stair. A suspended bridge connected the wings of the office building whose shape dated back to the 1937 model for the Garden City of the Future. As with the Secretariat building for UNESCO, the Van Leer Office Building lacked air conditioning and the sunshades failed to control the build-up of heat within the offices.