Addressing a national housing crisis—the mismatch between the supply and demand of rental homes for households with modest incomes—requires a comprehensive strategy to produce new affordable units, preserve existing inventory, and protect at-risk residents. Because more affordable units are lost than are produced, preservation must be a higher priority in this strategy. This essay proposes such a robust preservation strategy, including more resources, better tools, innovation, engagement of all relevant actors, and a nationwide network of local and state coordinating bodies dedicated to preserving the maximum number of affordable housing options. This essay is part of the Opportunity for All project.