The ensemble comprises the Puente del Rey, treated as a square over the riverbed, and the esplanade to which it leads, separating the river from the Casa de Campo on the left bank. The space is built upon the footprint of the underground tunnels and becomes an open and clear area, an immense balcony over the river, observing the atmosphere crowned by the Royal Palace perched on the heights of Madrid. The esplanade is formed exclusively by an extended sheet of granite and limestone that adopts a gentle undulating topography when negotiating with the facilities of the underground highway.

The opening of the Campo del Moro and the Casa de Campo to the city through the combination of this ensemble generates an unprecedented situation in Madrid. The multiple flows that until now were severed by vehicular traffic now reach a green lung of more than 1,700 hectares. The dense and consolidated historic center is linked without difficulty to a natural space populated by thousands of trees. This transition between city and park is achieved through subtle and sober elements sensitive to the past, through which monumentality is anchored at the foot of the elevated city.