In this episode of the Passive House Accelerator Podcast, Ilka Cassidy and Mary James are joined by sustainability experts Amy Cornelius, Paul Thompson, and Joe Messier as they delve into a groundbreaking retrofit project in Philadelphia. This six-part demonstration series, hosted by Green Building United, examines a project aligning with the new Phius REVIVE standard and the Living Building Challenge core principles. Listen as they discuss the integration of these standards, the challenges of retrofitting row homes, and the educational impact of their collaborative series. Discover key takeaways, innovative approaches to sustainability, and the surprising synergies between these certification programs. Tune in for an insightful exploration of how theory meets practice in sustainable building retrofits.