On the occasion of opening of the Morland Mixité Capitale project in Paris last week, Neue Zürcher Zeitung correspondent Nina Belz spoke to David Chipperfield about the project as well as the Kunsthaus Zürich extension, which opened last year. David Chipperfield elaborates on what makes Morland Mixité Capitale so unusual and explains why it is only with government pressure and a robust planning system that private development can be expected to contribute meaningfully to the city.