Thank you so much for your time and input, I have a while before I can take action on anything, but I want to be able to analyze a deal in my sleep by the time I get there and be confident that I did it correctly. 

Am I looking at this the wrong way or am I correct in thinking I should walk away?

From a death disclosure standpoint, you must disclose any deaths that have occurred on the property in the 36 months that preceded the sale, regardless of whether or not the buyer asks.Since each case tends to be so different, it’s nearly impossible to accurately determine the exact tangible value decrease corresponding with the crime.While @Kevin B. is correct that some buyers will be much more put off than others, I would caution you against thinking that it’s likely for you to find a buyer that flat out doesn’t care.  

If I refi for the cash, and do the full 80%, that would be a new loan of 96000, minus the 50000 owed, means I get a tax free check for 46000 correct?

@Dan Barli signed i couldn’t correct the typeo

If it’s a PCS you’ll have the time & tools it will just be the distance to consider. 

I am asking for great analysis tools, how to pull numbers, and any pointers.

https://www.biggerpockets.com/rei/pay-rent-online-payment-tools/. 

It’s a security if the partners don’t have another role in the deal, correct?  

Just insure it is installed correctly