A new report from the Brookings Institution shows that the D.C. metro area has the most “walkable places” per capita of any American city — one for every 264,000 people, beating out even New York City for walkability. Visiting Fellow Christopher B. Leinberger says that the Washington region could serve as the model for the direction the country’s other metro areas are heading over the next generation. The Associated Press already picked up on the…