In a recent report from the Pennsylvania Environmental Council, the city of Philadelphia was noted for lacking political drive and leadership in the development of sustainable buildings. Its rankings against other cities were among the lowest in the nation when comparing air quality, city innovation, green building, and recycling. Architecture has the greatest impact on the environmental issues the city of Philadelphia faces. The Reading Viaduct Sustainability Center bridges the viaduct over the Vine Street Expressway and back into the center of the city. It houses both educational public spaces, galleries, and commercial gallery space for major sustainability organizations in Philadelphia. The building's structure relies on the public path and orients itself to reveal the galleries within the commercial spaces.