In 2018, architecture firm Hickok Cole published a design concept for Timber Towers, a trio of mixed-use high-rises that would use wood as the principal structural material. The concept, which won an honorable mention in the SKYHIVE Skyscraper Challenge, was designed to span an entire block in Center City to the northwest of the Comcast Technology Center. According to the architects, the 1.9-million-square-foot plan would use 2,075,125 cubic feet of wood products, “easily replenished by North American forests in less than three hours,” and sequester 80,775 US tons of carbon dioxide within the structure, resulting in emissions savings are the equivalent those produced by 12,073 cars within one year.