Preserving existing affordable housing generally costs less than new construction, prevents displacement, and takes advantage of existing land-use patterns. However, it presents its own set of challenges: developers need to weave together federal, state, and local funding sources; employ state and municipal policy tools; and seek collaborative relationships with stakeholders. To better understand how affordable housing preservation happens, we highlight cases from around the country where developers have navigated complex policy and financing environments to preserve affordable housing. These case studies represent a range of contexts but offer wider lessons for people working to preserve affordable housing.