Already under the reign of François I, the area west of Paris, downstream from the Seine, where the La Défense business district developed, was considered strategic. At the beginning of the 1960s, buildings limited to 100 metres in height for a surface area of 98,425 sq. feet (30,000 m²) gradually sprang up and formed a complex nicknamed the new Manhattan. From this first massive development plan to the erection of the 231-metre First Tower – France’s tallest skyscraper inaugurated in 2010 – via the 184-metre Fiat Tower built in 1974, the progressively broader construction criteria have created greater architectural diversity.