Located in the eastern region of the Mexico City, this office rental project makes efficient use of the available lot and maximizes natural light which pours into the interior from a lateral light well. The vertical monotony of repetitive floors is broken by the skin on the façade consisting of vertical, pre-fab fibrocement louvers, whose configuration gives the illusion of boxes of increasing height stacked one upon the other. These louvers modulate solar radiation, provide privacy and work in conjunction with intelligent HAVC and illumination systems.