Bragging about your neighborhood's through-the-roof property values is, like, SO late nineties. These days, one-upmanship is all about establishing eco cred. Luckily, there's a handy new website, Walk Score: Just enter in your address, and the site instantly calculates your home's "walkability score," on a scale of 1-100. The principle is pretty simple: If you can walk to the supermarket and your favorite restaurant, for example, you can expect a high rating. If you have to get in your car just to get the newspaper at the end of your driveway, though, don't expect any walkability bragging rights.
And does walkability work? Sightline cites research showing that residents of compact areas (homes mixed with stores and services, and a street network designed for walking and strolling) are less likely to be obese, suffer fewer chronic illnesses, and may breathe cleaner air than suburbanites by being farther from the "pollution tunnel" of busy highways.
Such claims are probably true in a broad sense, but there are interesting complexities in the new science of walkability. All those nifty shops in walkable neighborhoods, for instance, are signs of gentrification, which normally drives density downward by replacing working class families with wealthier singles. Transit stations normally do not help bring more density, since many are surrounded by parking lots or have such high property values that neighborhood services can't pay the rent. Another paradox is that really charming walkable neighborhoods soon line up the pitchforks to oppose increased residential densification in any form.