The Stavros Niarchos Foundation Cultural Center, the new site of the Greek National Opera, opened to the public in Athens in 2016. The project includes a main theatre with 1400 seats and an experimental theatre with 400 seats; the National Library, with capacity for 2 million books, and a hilltop park of approximately 170,000 m² with 1500 m² of buildings. The auxiliary buildings and the park were designed with an eye on environmental performance and sustainability. Poltrona Frau Custom Interiors supplied the seats for the auditorium, working in close collaboration with the RPBW - Renzo Piano Building Workshop team.