Created on the occasion of the adoption or revision of a local plan, they intended to house:
- Public roads,
- Public parks and parking places, public works (administrative facilities, schools, hospitals ...)
- Facilities of general interest (campground ...)
- The areas verts.
The owner is prohibited from building on his land; it may give notice to the municipality to acquire the building. This 1 year to adjust the transfer of ownership . Otherwise, one and the other may enter the expropriations judge who will determine the compensation due to the owner.