The object of recovery, it appeared like an old, ill-kept bourgeois palace. The team building was heavily marked but uneven: the architectural syntax was well established in some parts, very narrow in others. The quality and completeness of the technical and functional performance varied greatly from area to area. Consequently they offered alternatives to the project decision-making more or less comprehensive. The architectural project has started with the reality of the building: the level of degradation of archaeological stratification, the available space to accommodate new features, Astati are the elements that have governed the relationship between conservation and change. The constraint of conservation has been considered here as a key constituent of the new functional organization, generated by reading the specific qualities of materials, spaces and signs. This interpretation, which transforms the will of conservation constraint matrix project, necessarily led to analyze the building according to its specific characteristics and unique, by prohibiting the use of typological criteria simplified and inadequate to restore the richness of form and space of bodies building complex and layered as the one in question.