In the hunt for energy savings, multifamily buildings are widely seen by energy efficiency program administrators as hard to reach. A number of challenges face multifamily building owners in undertaking energy efficiency in their properties, and program administrators in designing and implementing effective multifamily programs. Due to these challenges, multifamily households are often underserved by the energy efficiency programs they help to fund. A number of leading programs from across the country, however, are demonstrating that these challenges can be overcome, and that there is significant opportunity for cost-effective energy savings from the multifamily sector. This report recommends 10 best practices for designing and implementing effective multifamily programs and includes examples from leading programs. The results from these programs provide a snapshot of the possibilities for energy savings and reaching new customers.