Dunn Development is a real estate developer that focuses on building high-quality affordable housing. The firm was founded in 1988 and has grown since 2014 to become a leading developer of affordable housing in New York City, having built more than 1,500 such units. Dunn has built affordable housing mainly in Brooklyn, where it is based, but also in Queens and in the Bronx, where it has erected a mixed-income rental housing project. Dunns workload has increased significantly since Mayor Bill de Blasio took over in New York City, seeing more than 20,000 applications for a single project in one case. Dunn has had a keen interest in environmentally conscious projects, and it was one of the first to build Energy Star mid- and high-rise residential buildings in the United States. The firm has also worked on conversions, including a 99-lease for the Queens Hospital Centers historic T-Building, which Dunn plans to convert into 205 apartments.