Book excerpt: A guide for developers of affordable housing on how to work with the U.S. Secretary of the Interior. Contents: benefits of rehabilitating historic buildings for affordable housing (benefits to owners and developers, benefits to tenants, benefits to the community, a successful approach to rehabilitation, and solving common design issues in historic buildings); and 11 case studies of successful projects. Appendices: Federal section 106 review; state and local environmental review; and historic building codes. Glossary and bibliography.