All the profit must be extracted from the borrower in some form or another. 

She has no retirement so we would like to add a rental for her soon and she has almost no cash in the bank.My question is, what do you think may be the best way to extract the equity, and to use the value in this home?

Or is this an approximation extracted from debt to income ratio?

For starters, you can find a ton of FREE SFR data here: https://www.realtor.com/research/data/ For SFRs, we use the nationwide, residential "ZIP" data and extract what we need. 2) Since you are out of state, you need "Boots On The Ground".

Yes, you could theoretically sue them for the costs, but actually extracting the money from them is easier said than done.If you must talk to the tenant directly, keep it professional.

It has a cash flow of 500 dollars if i extract all the expenses and With a vacancy of 5% BUT i can see there is a lot of other renatal units that is posted on Our MLS in Our small town.

The intention would be to perform any necessary rehab once the title has been cleared to get it rent-ready and then refinance the home to extract the investment along with some of the equity.  

Sounds like you're trying to extract max equity? 

And the banker told me if I join Chase private client, they can do a cash-out refin on my current house and extract $290K out of it, so I can pay the investment house all cash, and they can do 3.75 for a 10/1 ARM loan.Should I do it?

I have been involved in residential mold extraction for nothing other than pure lack of HVAC use.