In the ‘Metropolitan’ section of this issue, the Italian architect Martino Tattara reflects on the way in which cities have responded to their housing crises. Analysing the relationship between property and housing, he recounts his experience of collective housing construction, as carried out by the architectural practice Dogma. In Berlin, Venice, London and Chicago, Tattara has taken part in the most important international forums of debate on the major challenges facing contemporary architecture and urban planning.