You say you "don't want to walk away from the cash flow it's projecting."

I haven't walked through the house but pictures look good.

I considered that property for my family home, and walked on that "basement" and it felt very sketchy.

If nothing else, I learned how to do just about everything as far as renovations go, and now can walk in to any property in the area and have a general idea of what I am getting myself in to and the costs of the rehab.A few takeaways from this project:1. 

Cash buyers are tending to get more closings because they are offering quick closings and the seller's like that.Learn how to say "no" and walk away from a deal that does not meet your requirements.  

You could be walking barefoot to fetch dirty water in Africa.

2) If seller's agent was blowing smoke then walk.3) Don't waste time and emotional energy on it in addition to losing a few bucks.4) Focus on the next deal instead of the misery of this one

You either get the property at enough of a discount to legally decontaminate it and make money or you walk. 

I have a potential flip I'm looking at and I was wondering if there are any contractors in the Pittsburgh/Monroeville Area that would be willing to walk the property with me?

There are too many contractors, and others, who cannot manage and would easily walk away after trashing YOUR building.