Bill de Blasio's campaign rhetoric focused on a tale of two cities: rich and poor New York. He promised to value the needs of poor and working-class New Yorkers, making city government work better for everyone-not just those who thrived during Bloomberg's tenure as mayor. But well into de Blasio's administration, many critics think that little has changed in the lives of struggling New Yorkers, and that the gentrification of New York City is expanding at a record pace across the five boroughs. Despite the mayor's goal of creating more affordable housing, Brooklyn and Manhattan sit atop the...