Philadelphia City Hall Sep, 2005 By Nan R. Gutterman, AIA and Carl A. Baumert, Jr., P.E. In Feature Exterior Envelope Renovation About the author ⁄ Nan R. Gutterman, AIANan R. Gutterman, AIA is a Project Manager for VITETTA. She can be reached at gutterman@VITETTA.com Prev America’s Showcase Hangar Next Fallingwater Is No Longer Falling