How are artificial intelligence, big data, digital twins and extended reality transforming the way we build our cities? Is it possible to decarbonise an industry? What should 21st century buildings and infrastructure look like? These and other questions will be addressed at Tomorrow.Building, the new debate and exhibition forum that Fira de Barcelona is launching to support the transformation of the construction sector, jointly held with Smart City Expo World Congress (SCEWC), from 7 to 9 November at the Gran Via venue.