Can Santacilia is a 3,300 m2 residential project with 15 dwellings and common areas. It is a careful renovation of two buildings located in the heart of Palma de Mallorca's old town. The buildings date back to the 12th or 13th century, although the building visible from Plaça Tagamanent was registered in the city archives in 1576 as Can Santacilia. Since then, both buildings have suffered several modifications, consequently the existing state prior to the OHLAB project is from the 17th century, with a subsequent reform in the 18th century. In addition, both buildings underwent alterations during the 20th century aimed at dividing and converting them into several dwellings, as a result, we found them highly modified compared to their original state.