A team comprising UNStudio, b720 Arquitectura, and Esteyco has been awarded first place in a competition for the Madrid-Chamartín Clara Campoamor railway hub. Titled 'Open Ecosystem', the winning proposal combines adaptive reuse with new architectural interventions. The existing historic vaulted roofs of Chamartín station have been retained due to their status as the "singular and identifying element of the station". Stepped terraces have been added to the structure to increase the station's permeability, as have public balconies stepping up and around the arches.