The case is one of the demonstration sites where the technologies developed within the H2020 project BUILDHEAT have been installed. The building is a large multifamily house in a small quarter in the outskirts of Zaragoza. It has 53 dwellings of two main sizes (i.e. 85 m² and 55 m²) distributed in 5 staircases on 4 floors. The building was constructed in 1988, is owned by Zaragoza Vivienda, the social housing Agency of Zaragoza, and is used for sheltered housing.