As a culture we hold dear social values such as public good, health and well-being, quality of life, diversity, and equity. The focus of this article is how Seattle's Central Library, a Silver LEED™ project, integrates social benefit into its design. While LEED provides credit opportunities for some social issues, many are not addressed by the LEED System. The Seattle project provides a rich example of how to integrate a broader range of social sustainability into green design thinking. Issues for consideration include: design to encourage social interaction, accessibility, economic development, cultural arts, and improved staff efficiency and ergonomics. This discussion searches for lessons learned that might inspire the emergence of new LEED credits.