Originally conceived as GFRC cladding, a number of material choices and unit configurations were studied by the architect, developer, and PNA West design team before arriving at an optimal solution. The facade consists of horizontally configured, insulated 3-dimensional spandrel units clad in white aluminum panels. Panels have been finished with liquid fluoropolymer high performance coating, applied with a technique derived from aerospace technology which was specifically adapted for this project due to the extraordinary dimension of the parts. The spandrel units are rigidly connected to the concrete structure with custom steel and aluminum anchorage arms, and the window units span vertically between them. This configuration achieved the soffit and coping geometry with a unitized approach, while minimizing the overall facade weight. The twisting form is comprised of 20 angled bay modules repeating in both soffits and coping condition and left or right angle. The modules repeat in all bays, but are each offset by one floor to create the dynamic spiraling effect while allowing a degree of repetition.