In the 1950s and 1960s, school buildings were rethought worldwide according to new necessities and a large number of education centres were also built in Spain. In this context, Miguel Fisac had the opportunity to design many school buildings and to attend specialised international meetings. The Cuestas Blancas School was built in Madrid in 1965 and became the most refined result of the Fisac’s experience in this kind of building. The work analyses in detail the Cuestas Blancas School to identify its values and particular contributions. The study forms part of a broader research project about school buildings, which allows placing the building of Fisac in relation to the school building advances of that time. The Cuestas Blancas School is a prominent example of school architecture, with an innovative organization and spatial wealth, that maintains its values up to the present.