Torre Espacio is designed to energize the space in which it stands and animate the skyline of Madrid. The design of Torre Espacio evolves from a square plan at its base to a gently curving lozenge, shaped by the intersection of two quarter circles, at its crown. Its intersecting curved surfaces are composed of many separate panels that must be individually fabricated and assembled. Hence, there was a need to discover and adopt a geometric order that can rationalize and facilitate the desired evolution from square to quarter circle. The architects have found this order by subdividing the building section into 44 horizontal layers and then subdividing each quarter circle of the plan into an equal number of radial segments. The intersections of successive layers in section with successive segments in plan define points along a vertical curve.

The mathematical formula describing this curve is based on the cosine, and while it simplifies fabrication and assembly of the curtain wall, its rate of curvature is not constant, but rather changes gradually over its entire length. This gives the resulting tower form its distinctive and visually appealing sense of energy.

The façade is an internally ventilated climate wall design. It achieves an average of 1.3W/m2C thermal rating. It integrates façade technology with the building HVAC systems. This results in a reduction of energy consumption, improved occupant comfort and acoustical properties, and a high transparency ratio which allows the façade to be executed in floor-to-ceiling glass. Better utilization of natural light reduces artificial lighting, leading to direct energy savings. Reduced cooling loads from less artificial lighting also leads to indirect energy savings.

The design also utilizes cool ceilings, with a radiant grid of chilled water looped above the perforated metal ceiling panels which increases the comfort in the office spaces by cooling without drafts.