How to determine target area when purchasing "buy and holds" in Philadelphia

[Michael Palmore]

I was told that a good target area to purchase buy and hold where areas that have the most jobs or near college campuses. The area with the most jobs is center city and that's way out of my price range and the same with college campuses. Not to mention near colleges there are a lot of "for rent" signs which means the supply is high in that area but not necessarily the demand. So does anybody have any other advice?