This report summarizes the work of NeighborhoodInfo DC in compiling a list of residential properties potentially subject to rent control regulation in the District of Columbia under the D.C. Rent Stabilization Program. Despite its importance, at present there is no definitive list or database of properties subject to rent control. The report provides a basic overview of rent control in D.C., methods for compiling the database, basic characteristics of those properties and owners, and the limitations. Based on this work, our initial estimate is that there are currently 4,818 properties with 79,145 housing units potentially subject to rent control regulation in the city.