Leadership teams have real power to drive improvement in schools by harnessing multiple experts' valuable perspectives and collaborative capacity. Even seasoned team members may not recognize their potential to address a persistent challenge in education: sustaining improvements over time. Fortunately, such sustainability can be intentionally planned and carried out over time. Even if the work is not sustained initially, good planning from the start can result in future leaders bringing it back thanks to the partnership, policies, and culture established by the team. Intentionality about long-term outcomes is a cornerstone of Learning Forward's Leadership Team Institute, in which district and school teams learn about processes and tools for improvement. The schools and systems participating in the institute have each been working on building team capacity and effectiveness as applied to a problem of practice tied to strategic priorities. This article discusses the leadership team framework and how to plan for sustainability. The article includes three examples of school systems participating in the Learning Forward's Leadership Team Institute that are following steps to build sustainability in their work.