I recently discovered the 80-10-10 What other programs are there?

You just discovered, the biggest pot of gold this side of your nearest rainbow. 

I’m pretty familiar with a lot of the bigger hitters, but would love to discover some books with less notoriety.Thanks!

I know that on 1-4, you can study comps and ARVs and have a fairly good idea, but you're still more vulnerable to market conditions (i think).5 or 6 units could be priced similarly, but if you increase NOI, you should be able to increase the appraised value, thus having better chances of a successful BRRRR.

I'm not familiar with the tax benefits, though I have spent a little bit of time studying up on it. 

Seems like, it is a Winn if I keep it or flip it, base on your comments , thank you Joe and David, I just need someone’s professional opinion, I took me about 6 months of studying the market, worked numerous deals, in order to close this deal.

None were reported nor discovered during inspections as the tenant did not permit the PM to enter the unit [now we know why].

You can also hire them to just do a feasibility study  for this site.

Looking for a firm to be a second eye on this possible deal and need to get a feasibility study performed any suggestions in the Philadelphia area that are affordable

Although, if a graduate is going to get a job in the area in which they studied in college, often times the lender can count that towards their employment history.