Not too long ago, people were saying East Liberty would take a very long time to become a popular residential neighborhood, and yet now it has. And when you look at an area like the flatter portion of Garfield near Penn, it is really so small that it can reach critical mass very quickly.
So we'll see, but I suspect it will take a lot less than 25 years for that part of Garfield to get pulled firmly into the expanding reinvestment zone centered on downtown East Liberty.
Edit: Incidentally, recently a decent number of homes have sold for
$100K+ in Garfield. Not surprisingly they are largely in the flatter part, with the highest values near East Liberty and along Penn.