Paris
Most of the postwar's presidents of the Fifth Republic wanted to leave their own monuments in Paris; President Georges Pompidou started the Centre Georges Pompidou (1977), Valéry Giscard d'Estaing began the Musée d'Orsay (1986); President François Mitterrand, in power for 14 years, built the Opéra Bastille (1985-1989), the Bibliothèque nationale de France (1996), the Arche de la Défense (1985-1989), and the Louvre Pyramid with its underground courtyard (1983-1989); Jacques Chirac (2006), the Musée du quai Branly.

Q: How many years was Francois Mitterrand in power?
14