Comprising 1,535 panels, the 12-story residential tower is a virtual precast concrete LEGO set combining columns, beams and wall panels with floor and roof panels. Though it sounds simple, erecting the 12-story structure is a serious undertaking. The driving force of the project is a 1.3 million-pound Liebherr crawler crane which lifts and sets components weighing up to 92,000 pounds each.