After winning an international competition held in 1993 to design the Master Plan for the Abandoibarra area of Bilbao, Pelli Clarke Pelli Architects designed its main compositional element: Torre Iberdrola. The tower was conceived as a softly rounded triangle in plan that tapers upwards towards the sky. Access to the building is through a sculpturally shaped glass lobby which encloses a large landscaped area. The tower is clad with a double-skin façade that follows the geometry of tilted cylinders, in order to standardize the curtain wall panels and reduce costs. The lobby is enclosed by a warped glass wall that creatively solves the challenges posed by its complex 3D geometry by using cold-bent glass and hybrid glass-and-steel structural fins.