Inserted in the program REABILITAR of the Santa Casa da Misericórdia of Lisbon, this building of very outstanding characteristics of the zone of Lisbon where it is inserted, presented a state of advanced degradation with several pathologies and fissures in the walls of the main façade and in several zones in the interior resulting from continued infiltration due to serious coverage problems. Given the specificity of the intervention, solutions were found that aimed to adapt the existing situation to the contemporary needs and future use of the building. Rehabilitation maintained, where possible, the existing materials such as parts of the floor, linoz stone and the wooden structure with the reconstruction of some degraded parts. All hydraulic and electrical networks have been fully rectified and adapted to current needs, as well as installation of a solar hot water production system.