Designed by Francisco Javier Sáenz de Oiza and completed in 1969, this concrete tower rises up 81 metres into the Madrid skyline. It is one of the most complicated and innovative concrete structures of its time, breaking with the typical conventions of residential architecture. 

When building Torres Blancas, the aspiration of Oiza was to build a unique residential building, of a great height, which would grow organically like a tree. The result was a structure that was covered vertically by staircases, lifts, and installations, like the vessels of a tree, surrounded by curved balconies grouped in the manner of leaves on branches. It has 23 floors for homes and offices, plus an additional floor at the top of the building, two basement levels, and the ground floor access level, in addition to a services floor reserved for general installations, located between floors 21 and 22. There is a large swimming pool on the roof terrace.