Foster + Partners are to carry out the comprehensive refurbishment of the Plaza Colón building at the heart of Madrid. The four-storey building is characterised by its distinctive stainless-steel diagrid façade that gives it a strong visual identity. The optimised geometry responds to structural efficiency, minimising energy and material consumption. Shops on the ground floor draw pedestrians into the building, with the permeable building envelope ensuring maximum visibility, allowing daylight to flood in and creating a friendly and inviting experience.