An addition to an existing data center in Aurora, Illinois, this precast building system consists of a 3-sided 2-story addition, complete with complex stair and elevator towers. The precast panel construction features architectural non-load-bearing insulated walls. The architectural finish is white cement, tint, and light abrasive blast to match existing structure. The wall panels were utilized as shear walls for the precast structure. The expansive 2-story office complex included non-loading spandrels and panels attached to steel frame.