When I.M. Pei designed the Mile High Center, it was his first major project as a professional architect and the first high-rise in Denver. Fifty years after completion, this impressive 23-story structure of steel, aluminum and curtainwall glass was in need of a new roof. To achieve an environmentally friendly installation with energy savings, LEED certification and Energy Star products, GenFlex Peel & Stick TPO membrane and GenFlex Polyiso turned out to be ideal for the job.