The Kunsthaus Zürich has been embroiled in a heated debate over the display of artworks from the collection of Emil G. Bührle, a Swiss arms manufacturer, due to concerns over the provenance of the pieces and their potential connection to Nazi-era looting. In 2021, the museum opened a new extension to showcase the Bührle collection, but the controversy led to a re-examination of the collection's history. As a result, the museum has committed to adhering to the Washington Principles and not displaying works with suspected links to Nazi-era looting.