Pittsburgh has been ranked as a top 10 city in terms of percentage of office/retail space in "Walkable Urban Places"
http://www.usatoday.com/story/news/nation/2014/06/17/walkable-urban-places-findings/10623587/
Full report here:
http://www.smartgrowthamerica.org/locus/foot-traffic-ahead/
Not really a surprise who else is on the list, and Pittsburgh's inclusion makes sense when you think about its still relatively thriving historic urban business core (including Downtown and the East End). See here:
http://www.bizjournals.com/pittsburgh/ne...cas-top-20-most-walkable-cities-and.html
But as the report and coverage are discussing, this is an important issue for future planning as it appears young people really are different this time, and so Pittsburgh will have to keep building on this area of strength to remain competitive as a destination for young talent.
Edit: Oh, and the report specifically notes that places like Pittsburgh have almost all their walkable areas concentrated in the core, with very little in the suburbs. I think as long as you also include the innermost suburbs (places like Wilkinsburg, Aspinwall, Mt Lebanon, and so on) in the core, that is largely correct.
That represents a real challenge for the long-run walkability of the Metro, but I think there are some reasons to hope. First, even outside the innermost suburbs, there are in fact historic urbanized centers, mostly along the rivers or formerly-prominent rail lines. Many of these have fallen on hard times, but with smart land-use and transportation policies (e.g., more investment in rapid transit along the historic transportation corridors, less investment in new highways through historically undeveloped areas), these could become new walkable bedroom communities and even satellite towns/cities.
Second, there is a whole movement afoot to figure out ways to "retrofit" autocentric suburbs to make them more walkable. I suspect Pittsburgh won't leap into this area too quickly, except with some TOD along the T and maybe the Busways, precisely because it still has lots of opportunities to reinvest in walkable areas without taking such extraordinary measures (this is in contrast to much newer metros whose main expansion occurred since WWII). But if and when it finally becomes necessary, it may benefit from all the other practices and technologies that are being developed elsewhere.