If seller is willing, get a written agreement authorizing you to make specific renovations and what happens if Seller voids the contract, Buyer voids the contract, or whatever. 

Not that you should keep them, but you could ask the local housing authority to raise the rent, mine just requires a simple form.

Lessee shall not allow persons other than those authorized by the Lease to occupy the Premises as guests for periods exceeding seven consecutive days during the term of the Lease for any reason."

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You could send them a friendly email and let them know that if they would like him to be an authorized occupant, he can submit an abbreviated version of your application so you can run a basic background check.

The HOA most likely has the authority to require the tenant be evicted by Owner, or may be able to do so themselves if Owner or their Rental Manager fail to act if they are in violation of the HOA rules.

You need the authorization in writing from the person who owes the debt.

However, regarding owner name you can also use the local county tax authority to verify in a lot of areas (at least here in Texas). 

The taxing authorities are much worse to deal with than any other agency.

Who has authority to make decisions for minor or major repairs?