ABSTRACT A range of socioeconomic factors, including income distribution, productivity and land use policies, are thought to influence the development of contemporary multifamily housing markets in the United States. Focusing on Washington, DC, as a case study, we use data from the American Community Survey to assemble socioeconomic panel datasets for the years 2010–2019. Through spatial regression analysis, we explore which socioeconomic measures and land use policies are associated with the effective supply of tenant-occupied multifamily housing. We interpret our findings considering issues such as displacement, lessor habit formation, demographic shifts and the uneven growth of transit-oriented housing in DC's current housing landscape.