A new study finds young professionals are the force behind more walkable communities.
The report, by the Brookings Institution, ranks the Washington, D.C., region first among the country's major metropolitan areas in the number of "walkable places" per capita.
The Washington region, with 20 walkable places, outranked New York on a per-capita basis. Boston ranked second. Rounding out the top five were San Francisco, Denver and Portland, Oregon. Of the top 30 cities, Tampa, Florida, ranked at the bottom.
Walkable cities have been around for centuries, but experts say that after the rise of the automobile, planners and real estate developers hit on the lucrative suburban strip-mall formula and stuck to it.