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Data on the financial performance of multifamily rental housing has not been available nearly as long as such information for single-family housing. It is believed that this lack of information has increased the cost of debt and equity capital to apartment housing and thus has increased the rents paid by apartment residents. Data on apartments, which is now becoming available through an industry-sponsored initiative, has the potential of narrowing this information gap. This article has several objectives: to describe this new database, AptDataTM, to housing researchers to assess the strengths and weaknesses of AptDataTM for housing market and policy research, to compare estimates from AptDataTM with those from other sources, and to offer several potential research applications of this new data resource.