Neighborhoods were considered eligible for gentrification if in 2000 they were in the lower 40 percent of home values and family incomes for the area. Census tracts in Baltimore, New York, Los Angeles, Washington, D.C., Philadelphia, San Diego and Chicago accounted for nearly half the country’s gentrification from 2000 to 2013, according to the report. Of the 1,049 census tracts across the country that experienced gentrification during that time period, 501 fell in those cities, according to researchers.