Métal 57 Boulogne-Billancourt, France

Since the Renault factory closed in 1992, the banks of the Seine in Boulogne-Billancourt have been the focus of an enormous redevelopment scheme covering more than 37 hectares. Built a few years earlier, the 57 Métal workshop had been waiting for a project that would be appropriate and in keeping with its industrial heritage. At the same time as redefining the most representative elements of the building, which is instantly recognisable by its succession of sheds, architect Dominique Perrault has inserted a 9-storey office building.

Except that this office building is open to the public, because Métal 57 now has a 3,500-m2 green rooftop, restaurant, fitness centre, auditorium and business centre laid out around an internal street. Its 8 certifications have been awarded in recognition of its materials recycling, soft mobility and urban agriculture credentials. The way that its glass and stainlesssteel exteriors reflect light in all directions has made Métal 57 an iconic destination for visitors.

TECHNICAL SHEET

• Architect: Dominique Perrault Architecture

• Developer: BNP Paribas Immobilier