Sustainable development in the Americas and across the world —identifying and meeting different present-day needs by using the resources already available, so as not to compromise the resources of future generations—has important implications for future environmental, economic, and social well-being. Practitioners must address the need to balance preservation of historic places and ancient living sites, while recognizing the significant relationship between conservation and development, tourism, and sustainability. There remain potentially irreconcilable differences between environmental goals and heritage conservation. This conference theme will feature case studies that demonstrate how new uses for historic buildings develop and incorporate new rehabilitation programs such as retrofits to improve energy efficiency, and how significant alterations and loss of fabric can be avoided. Participants will demonstrate how maintaining the integrity of sites can be achieved while meeting current code requirements. Practitioners will address the increasing challenges of sustainable development and how the field of preservation has demonstrated the vital role it must play in conserving and sustaining local communities, local identity, and traditions across the Americas.