This was the first tower in Cuatro Torres Business Area to complete its foundation.

The building started rising from street level in late February 2005.

The structural system of the underground garage is completely different from the tower: its columns, beams and floors are made of pre-cast concrete pieces, while the tower is built with in-situ poured concrete.

A topping-out ceremony on March 20, 2007 featured hoisting of the Spanish flag along with a fireworks display.

The building's elevation features cosine curves on two sides, forming a transition between its square base and elliptical roof plan.