If you look at each area, you'll see how volatile the SFR's prices are in these fringe markets. 

Hey @Christian sifuentesThere's a lot you can do with a long term perspective in a C/D.First off, I want to encourage you to stick to the fringe area of what you consider risky.

and being able to snag great properties on the fringes or upcoming areas so looking to do the same in Philly.

There are plenty of RE deals to be done that you don't need to be on the fringe so much that you need special contracts.  

After the first property in a lC neighborhood I'm learning that I want to be on the fringe of better areas (something you won't know until you jump in!) 

You might also look on the Northern fringes of the metroplex near places like Anna, Melissa, Van Alstyne and Sherman.  

The properties are in a fringe area...Two blocks over, 1000 sq/ft turnkey  houses are going for 125k and two blocks in the other direction the same houses are going for less than 40k...I didn't mention it before, but the three SFR's are all on the same street...So I can maximize my appreciation with to good rehabs.  

I am no economist (in fact hated that class in school) but if you look at the amount of Federal debt, the fact that Social Security and Medicare are running out of money, that to keep the economy propped up the Fed just prints more money, I have to agree with these more fringe prognosticators that we are in for a correction in the near future.  

The neighborhood we bought in is on the fringe of a really hot market where in some cases, older homes are being bought only to be demolished and replaced with a much more expensive home.  

First, there are very few multifamily units in desirable areas (inside or on the fringe of the 610 loop), and second, the few multifamily units that do exist are WAY too expensive for the numbers to even come close to making sense.