Casa Burés, built between 1900-1905 by Francesc Berenguer -a close collaborator of Antoni Gaudí, has 7.700 s/m distributed over 6 floors and is listed since 1979, enjoying the highest protection category as cultural heritage. The modernist architecture and interior original elements were respected and restored because of both regulatory requirements and a high sensibility by all the stakeholders. The interior design project was carried out by Estudio vilablanch in collaboration with TDB Arquitectura and commissioned by Bonavista Developments. The main goals were to recover and highlight the building original decorative elements, and to adapt the housing to contemporary regulatory and functional needs in term of distribution, technology, safety, accessibility, ecology and comfort. There was a key and strict strategy: all the original architectural and decorative existing elements were restored, while new materials were added when needed; these new materials should not compete neither imitate the original ones. The team defined three interior design concepts matching the intrinsic qualities of each existing space: 3 lofts and the common areas recovered their original industrial character; 2 palatial residences were carefully restored respecting the existing modernist elements (mosaics, polychromed ceilings,reliefs…); and 21 flats were conceived as contemporary residences with rich original elements. The conceptualization included design and definition of materials and finishes.