The 1927 architectural building exhibit for modern city dwellers, the Werkbund Estate, comprises 33 houses and 63 apartments from 17 architects, including Le Corbusier, whose entire oeuvre has been given World Heritage status by UNESCO. Strict budget guidelines meant Le Corbusier used cheap materials (brick, stucco and tile) characterised by flat, grass-covered roofs and linear windows. This building houses the new Museum which opened April 2006.