Earlier quoted context omitted.
Berlin is rapidly gentrifying, there's a R.E. bubble going on, poorer people are being pushed out of the city This is true in lots of fun cities, primarily because it's so hard to build new housing stock—which is a Bad Thing, as Matthew Yglesias describes in The Rent is Too Damn High . Britain is suffering from a variant of the "no building" problem too: http://www.buzzfeed.com/dlknowles/britains-dysfunctional-pro...…
It's not quite that simple. Building up can ruin the character of the neighborhood, which is often a big part of the allure. I do think we're chronically underbuilding in a lot of places (SF being an extreme example), but the existence of steel and elevators is not a panacea for the "gentrification problem".
Well then, less allure would lead to lower prices, right? What's not to like?