Our countrys rental housing challenges are changing in ways that not only affect an expanding segment of the population but also implicate other top domestic priorities. We face a nationwide housing affordability problem, insufficient housing supply in prosperous regions, a problem of housing location within metropolitan regions, and a neighborhood distress problem. Some states and localities are starting to respond to these challenges in new and creative ways. But without a renewed commitment from the federal government, these efforts will never be sufficient to address the breadth and depth of the affordable housing challenges we face today.