My goal of course is to get it as cheap as possible and even though this may be a business for the seller, they still may be driven in part by emotion and their desire to not lose money on the deal.

I'm hoping someone can please help me with the data needed for TOTAL ROI.  

As long as you purchase/build in a healthy market that is not oversuppllied, decades of historical data shows that you can be reasonably certain to "sell your service."

Just so you understand holding costs would include the negative cash flow of the property while you are house hacking.If you can post your analysis data I would be happy to give my 2 cents.Hope this helps

I assume you have driven by the house and walked around the yard?

Rentometer takes users expectations as data points and may not necessarily be accurate.

(You will probably need tax data for these sales as they will probably not have used a broker or ever been on the MLS.)Walk the house and point out as many issues as possible.

@Tim Jacob -- In regards to your advice to Annie about screening PM's, any data supplied on their occupancy, retention, screening, etc. is always/already coming from them; i.e. not so good PM's can supply not so good data.

I will use the data to learn a few things and then to argue for better terms from a lender if necessary.  

@Stefan W.While it is true that no one has a crystal ball and can see into the future, the National Association of Realtors has access to far more data than other entity in the U.S.