. >> with the decreased me troll polmetropolitanization, should e be thinking what we build, how we build, or changing what's already been built? >> you've hit a couple of points. one notion is significant that we try to retrofit some of the things that we have with better thinking, better planning, better urban design. that's very much what john norquist and his colleagues are working on. if you look at the realtor survey and others. there is a dichotomy of what people want. people who respond to the surveys, they talk about they want privacy, large square footage. they want access to amenities. they want proximity to jobs. in many cases you can't have those things in a denser situation. you can have proximity to jobs and mass transit, but if you don't have a 5,000-square-foot house with an acre of yard you might not have the privacy you want. i would argue a different measure of privacy might be appropriate. i live in washington in a very dense area and i think i have lots of privacy. >> we're going to take a short break. when we come back we'll talk about the health of cities apart fro