I’ve already gotten the whole home inspection which revealed some things I was expecting (roof with only a few good years left, old furnace and water heater) and a few things I definitely was NOT expecting (outdated electric on 60 AMP service).Not sure how to handle moving forward with this deal.

(your posts reveal that you have no knowledge of applying for or getting approved for a mortgage.

Sales volume can reveal a lot. 

The total profits math will be revealing.

Virtually the only thing is non rule could be pratically applied for is comparing like properties in the same locations ( maybe even same street) and then it might reveal only the initial cash flow ratios in those same locations with same type properties. 

As it stands now, though, it's an eyesore on my otherwise lovely little block.A little digging reveals that it's coming up for auction at a tax sale. 

I recently found a property I was interested in and upon further research revealed it was under contract until 30 Nov 2017 (per listing agent) The property could not be shown until that contract expired.  

It wasn’t until I spoke with the tenants that he revealed to me he had deposit money with the seller.

He was very gracious with his time and answered all of my questions and he even revealed that he was previously a board member of the local apartment association (of Northwestern PA).

An obituary might reveal some names.