With its new extension, the second of it's 50 years history, the Museum of Art of Jolette is aiming to reanchor to its context as the gateway to the city and a plaza extending to the river.The original project, built in 1974, was designed by the Architect Corbeil,in a cross format inbedded in a Concrete bunker. The hosted a double height hall united to a unique exhibition hall, echoing the main space of a church, by a quality vertical promenade.A unfortunate 1990 extension, eliminated the double height hall, distorted the exhibition hall and reduced the vertical visit to a labyrnth of fire exits.The new 2013 extension will reestablish the quality of the inner spaces and open up to the city. A Plaza in front of the museum will extend onto the roof of the museum to cover the 1990 extension, on the outside, and recreate a vertical promenade culminating with a new outdoor exhition space on looking to the city.The Museum plaza and observatory will host a rotation of ephemeral artwork that will renew annually the urban visbility of the museum.