CNT Energy and the American Council for an Energy-Efficient Economy (ACEEE) examine the factors that contribute to effective energy efficiency program design for multifamily buildings. The report provides an introduction for utilities and other energy efficiency program administrators to the multifamily housing sector, the market for energy efficiency within it, and the interests and concerns of sector stakeholders as related to energy efficiency. It outlines nine strategies that can help utilities design and implement energy efficiency programs that will attract multifamily building owners and achieve deep energy savings. It also provides examples of successful programs funded by utility-customers that demonstrate how effective energy efficiency program design benefits building owners, tenants, and utilities. Long-term benefits to multifamily building owners include direct savings on utility bills, reduced maintenance costs, and decreased tenant turnover.