Rationality and efficiency are the key characteristics of the building that is home to Italy’s largest publisher of financial information: Il Sole 24 Ore. The building transformed the entire aspect of a large former industrial area. Renzo Piano’s design sought to rationalize the building’s spaces, maximizing their functionality and productivity. The building reflects the philosophy of transparency, but also of comfort and elegance. Today, the head office of the Il Sole 24 Ore Group still represents one of the most advanced examples of sustainable development and low energy consumption in Italy. The new building was designed for the Il Sole 24 Ore Group around an already existing building that hosted Sit-Semens and became Italtel in the ‘60s. This originally industrial building was subdivided into five rectangular blocks with a courtyard.