Posted on May 28, 2015 by Amy Langfield in CBS CBS, By Amy Langfield Renters across America’s biggest cities are finding it more expensive to keep a roof over their heads. From 2006 to 2013, the population of renters grew in all 11 of the largest U.S. cities, and the median rent grew faster than inflation in almost all of them, according to a new study by the NYU Furman Center and Capital One (see chart at bottom).