With a budget lower than the norm for subsidized housing at the time, Walden 7 was built in the area to the west of Barcelona. The building is composed of 18 towers which are displaced from their base, forming a curve and coming into contact with the neighbouring towers. The result is a vertical labyrinth with seven interconnecting interior courtyards. The area originally devoted to communal uses was reduced to allow an increased number of apartments. These apartments are formed on the basis of one or more 30-square-metre (36 sq yd) modules, creating on different levels, dwellings that range from a studio, consisting of a single module, to large four-module apartments.
The tramway stop near the building is called Walden.
The façade was originally covered with small ceramic tiles. As these tiles kept falling down and became a hazard for pedestrians, in 1995 a refurbishing of the building took out most of them and the façade was painted instead.