The ratio of college-aged and elderly residents was lower, at 12% and 10%, respectively. As of 2017, the median household income in Community Districts 1 and 2, including Longwood, was $20,966. In 2018, an estimated 29% of Mott Haven and Melrose residents lived in poverty, compared to 25% in all of the Bronx and 20% in all of New York City. One in eight residents (12%) were unemployed, compared to 13% in the Bronx and 9% in New York City. Rent burden, or the percentage of residents who have difficulty paying their rent, is 58% in Mott Haven and Melrose, compared to the boroughwide and citywide rates of 58% and 51%, respectively. Based on this calculation, , Mott Haven and Melrose were considered to be low-income relative to the rest of the city and not gentrifying. Land use and terrain Mott Haven is dominated by tenement-style apartment buildings and large public-housing complexes. There are three historical districts consisting of brownstone-style rowhouses. In the last two decades, construction of modern two- and three-unit rowhouses and apartment buildings has increased the percentage of owner-occupiers. The neighborhood contains one of the highest concentrations of New York City Housing Authority (NYCHA) projects in the Bronx. The total land area is roughly one square mile. The terrain is low-lying and flat except around St. Mary's Park, where it is somewhat hilly. Historical districts and landmarks Three Historic Districts are located in Mott Haven: Mott Haven, Mott Haven East and the Bertine Block. The Mott Haven Historic District is located on Alexander Avenue between East 138th and East 141st Streets. The district is primarily residential in character with four- and five-story row houses dating to the last half of the 19th century, and contains the row of brownstones known historically as Doctors' Row and Irish Fifth Avenue. It also has the 40th Precinct police station, the 1905 neo-renaissance Mott Haven Branch of the New York Public Library, and Saint Jerome's Roman Catholic Church. It was listed on the National Register of Historic Places in 1980. The Mott Haven East Historic District is located on East 139th and East 140th Streets between Brook and Willis Avenues. The district contains rows of brownstones, designed by William O'Gorman and William Hornum in 1883, combining Dutch and Flemish architectural aspects on the north side of East 140th Street and neo-Grecian aspects on the south side of East 140th and on