David Chipperfield Architects has revealed its winning design for an extension to the Kunsthaus Zurich art gallery in Zurich, Switzerland.

The early 20th century building will continue to house the Old Masters, Giacometti collection, Swiss art and popular large-scale exhibitions, whereas the new 20,500sq m (220,660sq ft) extension will display classic modernism and art starting from the 1960s, as well as the Bührle collection.

Photograph: courtesy if David Chipperfield Architects and Imaging Atelier