The list of Madrid works by the British architect Norman Foster – Cepsa Tower, Axis at Plaza Colón, the Hall of Realms at the Prado Museum – will soon be including an office complex for the Spanish sustainable infrastucture and renewable energy conglomerate Acciona, in the fast-growing Méndez Álvaro area of the capital. The idea is to refurbish an existing, Neo-Mudéjar-style industrial shed – built in brick, in 1905, by Luis de Landecho – through various strategies that complement one another. First, rearranging the interior spaces, where, under a single historic roof, a series of stepped platforms bathed in abundant natural light will form an indoor topography, as in other Foster projects inspired by his Climatroffice rapport between nature and office, such as the new City Hall of Buenos Aires. Second, using timber for the structure and the claddings of the terraces. Finally, creating a park outside, all of 10,000 square meters, to enhance the bioclimatic performance of the building, which is to be called Acciona Ombú, while giving it the civic presence and decorum required of it.