The site is next to the Jardin d’Acclimatation, a 19th-century children’s park and zoo at the north edge of the Romantically landscaped Bois de Boulogne. The architect had to build within the square footage and two-story volume of a bowling alley that previously stood here; anything higher had to be glass. Mr. Arnault’s program for the Foundation, whose stated mission is to stimulate artistic creation, called for a museum with galleries for permanent and temporary exhibitions, and a concert hall. gcF V$