The Natural Resources Defense Council (NDRC) is one of the largest environmental activist organizations in the United States. Their sustainable building journey began in 2003 when GCI helped NRDC’s San Francisco Office become the first LEED Certified tenant improvement project in the city. Over a decade later, in 2017, GCI was brought back as part of the project team pursuing both the newly released LEED v4 and the rigorous Living Building Challenge Materials Petal. The project’s materials strategy prioritized reuse, followed by a focus on Red List-free and Declare labeled products to ensure a healthy indoor environment for occupants. Through this project, GCI gained extensive experience in healthy materials vetting and created new processes for subcontractor education and outreach. GCI also developed and executed pioneering strategies to accomplish an unprecedented 95% waste diversion. The project achieved LEED Gold Certification (v4) and the Living Building Challenge Materials Petal, fully aligning with the NRDC’s pursuit of sustainable, healthy environments. With its emphasis on reuse, the project reduced waste, harmful pollutants, and cost, while contributing to increased employee health and productivity through a comprehensive materials strategy. In 2018, the project was awarded CoreNet Global’s Sustainable Leadership Award.