The theme of the 4th International Architecture Biennale Rotterdam is the Open City, a city that is diverse, lively and socially sustainable, where people can productively relate to each other culturally, socially, as well as economically.

More specifically, with the theme Open City: Designing Coexistence, the 4th IABR raises the question of social cohesion in the city from the point of view of its designer: how can architects and urbanists make realistic contributions to the sustainable quality of the urban condition.

With three exhibitions, a unique collaboration with a public broadcaster and an extensive side program of lectures, film screenings, debates, workshops, an international master class and other events, the fourth edition of the International Architecture Biennale Rotterdam (IABR) embraces the theme of the Open City, a city that is diverse, lively and socially sustainable, where people can productively relate to each other culturally, socially, as well as economically.