How to find an accurate value....1.

I have all the current owners expenses (tenants pay their own electric), so I know those are accurate.  

Either I take it on or the lender does.In short term deals I've performed with an AUD lender, I accepted the risk of currency fluctuation and it was written into the lending contract that they were to receive their base AUD amount plus interest as agreed, regardless of any currency fluctuation.  

Make sure all of the numbers are accurate, and more importantly, verified.

You would probably do the best to start in performing mortgage notes where you act as the bank.  

Did some research on my own and found according to the fair credit reporting act unless they can show a charge as accurate, complete and verified the disputed charge has to be removed. 

My end buyer could seek specific performance and sue me to deliver title that I don't have. 

A POF shows the ability of a buyer to buy, the ability to perform in the contract as it has been made.

Is that accurate?   

If you want to isolate performance down to each rental, you can set them up as separate entities and track income and expenses for each.