Bloomberg CityLab, a partnership between Bloomberg Philanthropies, the Aspen Institute and The Atlantic, has created a series of graphs that show how rent costs in 30 U.S. metropolitan areas have changed since January. One graph shows that rent in San Francisco has fallen by 18 percent, the largest decline among high-cost cities. Another graph shows that there has been a 4 percent increase in rent in Las Vegas suburbs, despite Nevada having the second highest state unemployment rate of 13 percent.