What’s your Walk Score? Thats a question that has become increasingly popular among urbanists since the founding of Walk Score seven years ago. Now real estate agents prominently display the number on their listings, knowing the value it adds to properties. Matt Lerner is a co-founder of Walk Score and its original chief technology officer, and is now vice president of local engineering at Redfin, the company that purchased Walk Score in October. He is our guest this week on 'Knight Cities.' Email me via: Coletta (at) knightfoundation.org.