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The « ACBA» is an administrative building housing facilities for political and economical territory developing in south of France. The competition brief for the extension of the 80's existing building raised the following topics: Provide the administration with extra working spaces Offer a new and enlarged, fully equipped, auditorium for boardrooms and conferences. Re-enforce the dynamism of the “ACBA” through a contemporary extension. The organization of the existing building was characterized by the articulation of different services all around a main octagonal shaped “atrium” space. This disposition presented the inconvenient of an “introverted” building, turned on itself and lacking visual communication with the surrounding outside. Particularly, an existing park, south of the building, was entirely left unused and invisible at the back of the building. The project aims to restore a “breathing” dialog with the outside: it first shifts the gravity center of the existing “atrium” towards the park, then open up the all existing façade towards the park to plug in the new extension. The extension is composed of a slightly slopped auditorium, for 120 persons, topped with an open space for 40 workers. The extension “head” housing the auditorium is derived from the shape of the existing atrium ...