Posada del León de Oro, Madrid, Spain

Comprehensive refurbishment of a hotel in the historic center of Madrid, with structural renovation and reinforcement; archaeological preservation of 12th-century Christian walls built as an extension to 9th-century wall remains of Muslim origin, including remodeling of the roof; rendering of facades and replacement of joinery and metal fittings; reconstruction of an original sewer with ceramic vaulting; installation of two elevators; renovation of paving; restoration of a staircase and installation of lighting; heating with radiators and radiant floors; air conditioning; solar panels; fire protection, and telecommunications.