You also cannot complete your Title review until you have a survey.

Who owns the title? 

The property needs to be titled, the home made of non flammable materials.

The DSCR loan allows you to close and title will arrange the vesting to the LLC.The LLC will protect you and your assets against any renter liability/claims.

The legitimacy of the contract probably only really matters if you have to go to court/arbitration to enforce it.That said, your title company would be a good place to start in terms of getting a legal review, I'm sure they have a real estate lawyer(s) on staff or retainer depending on the state.

Also, we have witnessed a lot of tenant applicant fraud related to income verification and employment, in addition to identity theft.

A closing / title company can handle the transaction but may want to get a lawyer to draft the documents.Assuming you are buying in your name and not a LLC - if a LLC then there would need to be additional docs like a authorization for LLC to borrow $ etc

Any recommendations about a how to chose a title company and a real state attorney?

I didn't have to read past the title of the post to tell you SCAM.

I think a better title is "when not to do a cost seg".