Located on the historic site of the Hospices Etienne Sabatié, the Pierre Boulin Hospital, built in 1971, unsuited to today's medical activities, has been considerably extended by a consultation and accommodation building. The rest of the services remain in the old building, the extension is organised around a central artery linking the two.

The successful extension are urban integration by its geometric logic. To the east, this geometry is based on that of the Pierre Boulin hospital and, through a large arc of a circle of 600m radius, it ends to the west on that of the Etienne Sabatier site.

The typological concept here is hybrid. At 2/3 of the thickness of the trays, the buildings are "looped" to ensure interdepartmental flexibility, at the second third, the units are open to guarantee a general view of the outside from the rooms.

Architecturally, 5 branches are deployed on an urban base, facing the entrance to the site. With a sober and modern writing, their clothing is made of a metal skin with metallic colours, vibrant according to the context.