The bearing stone masonry walls of the building were fully strengthened. The plaster was removed; the loose parts of the stone masonry walls were reconstructed and repaired by replacing the stones; the cracks were repaired and walls surfaces were repointed where necessary. Subsequently, perimeter foundation was constructed and both sides of the stone walls were jacketed with shotcrete at their full height. In order to strengthen the crest of the walls a reinforced concrete perimeter beam was constructed and was followed by the construction of the concrete roof slab.