Enforcement on STRs is pretty strict right now. 

Contracts are only enforceable if they abide by the law.

But he does not have a choice to stay and not renew (as long as you enforce that).  

If I were to purchase a property at the auction that is foreclosed for first mortgage but has code enforcement liens, will the code enforcement liens go away after I win the bid and pay off the mortgage or do the liens stay on property and I am responsible for them?

If they are VERY professional, they will have their processes in writing as verification that it is enforced equally and fairly by their entire staff.6.

Most counties go after the owner to enforce issues with the tenants.

I know the Guide isn't law, but in my experience its not the law that is solely enforced, but also the derivative regulations, formal guidance documents, as well as case law history.

Beneficial Ownership Information ReportsAre they actually going to fine people $591/day for being late? Or all together forgetting? I just did one for an entity I created this year. It has been 89 days since formation...

The only thing you can enforce here is quiet hours, not people talking on the phone (albeit, late at night).

You make the mortgage payments on their behalf.Advantages:Full Ownership: You gain full legal title to the property while keeping the favorable 3.25% interest rate.Control: You have more control over the sale because you hold the deed.Simpler Resale: Since you hold title, you avoid the complications of a land contract when reselling, especially to FHA buyers.Risks:Due-on-Sale Clause: The lender could potentially enforce the due-on-sale clause if they find out you’ve taken title, though this is relatively rare in practice as long as payments are made.Higher Closing Costs: You would need to close formally and cover title, closing, and potentially transfer costs.3.