Young, educated professionals are moving to U.S. cities, driving up prices and spurring more development. Of the top 30 percent of U.S. households by income, 400,000 more lived in urban neighborhoods in 2014 than did so in 2006, at the peak of the housing boom, according to a new University of California – Berkeley study. Rents in cities nationwide now average about $1,730 a month, compared to $1,250 for suburban spaces, according to CoStar.