There are some gorgeous old row buildings in PA (and lots of other old, once industrial towns) that are boarded up and empty and usually right on the main drag in the center of things (great for walking/biking). They are cheap...but they are also (some of them) zoned commercial which means that generally they can't be lived in. If the zoning were to change to multi-use, the space would definitely appeal to youngsters who do the socials with plenty of space for a home studio, bedroom, huge closets and bathrooms etc. rather than them having to join the scrum around the few houses are built and overpaying, they could use that money/energy to build equity in a fixer upper.
The building tech has also improved alot in the last 20+ years. Adaptations that were impossible then...are possible now. Improvements in insulating, retrofitting...everything has advanced a great deal. Complete tear-downs are no longer necessary in a great many cases. But people have to be willing to stretch their minds and not just go for the easy solution.