At Calle Ombú 6 in Madrid, an office building for the Spanish infrastructure and renewable energy firm Acciona has been inaugurated. An industrial plant raised in Neo-Mudéjar style in 1905 by the architect Luis de Landecho has been repurposed, preserving its loadbearing frame with steel trusses and its original brick envelope. Protected by a historical roof, a lightweight stepped wooden structure with lighting and ventilation incorporated into it allows configuring a flexible space. More than 10,000 square meters are given over to offices, and a courtyard offers staff the option of working in the open air. A 12,400-square-meter park has also been created. The project’s carbon footprint and its impact across the board have been carefully measured and controlled. Norman Foster’s firm has worked here in collaboration with Madrid-based Ortiz León Arquitectos.