A study of 9,000 adults by LeadingAge and The Lewin Group finds the availability of an on-site service coordinator, such as a social worker, at federally subsidized senior housing reduced hospital admissions among residents by 18 percent. About 40 percent of subsidized senior housing properties have on-site service coordinators. The study is a part of a MacArthur-supported research project to explore whether affordable senior housing can serve as an effective platform for helping to address the health and long-term needs of low-income older residents. A project website features findings from the study, results from a survey about on-site services, and interviews with state policymakers about the role of affordable senior housing services.