Upon inspection it was evident that the property was a flip implementing incredibly poor construction techniques and materials.  

I just wanted to ask, have you considered asking them to bring document evidence of their divorce?

When she moved out, there was a huge mess made on the home, (Trash, carpet was left extremely dirty, messy toilets,  dirt and animal fur all over the place and strong smell of cats including evidence of cat claws on the carpet steps.

Any advice, opinions, evidence or analysis would be much appreciated. 

Make sure you are provided with physical evidence that their values on each property are what they say they are.

Looks great.The results of my home inspection contained the following concerns:There is evidence of water leakage and damage throughout the basement.

You will need solid evidence that the repair will get the business on track.You will need projections with detail assumptions explaining the reasons profit will increase after repairs.You must occupy 51% to be SBA eligible.Deals like this get done under SBA loans all the time but business acquisition with real estate has more aspects to consider than just a straight real estate purchase.

. * was there any evidence of an illegal unit in the basement in the past?

I pretty much knew this answer as evident by me saying "I am aware this is irrelevant". 

I do believe that the BEST AND EASIEST way to strenghthen your belief is to see evidence of what you're trying to believe in.