Selling a house with tenants in it is much more of a pain because of arranging times with the tenant and avoid maximum inconvenience. 

I wasn't sure if this arrangement was an original idea or something that I could better research - a recognized approach.

If your work brings you to Michigan I'd love to meet up for coffee or see if we can't arrange an STR meetup in the Detroit Metro area during your next work trip here. 

In your case, you probably have a good tenant; however, for the most part, it is best to avoid this kind of arrangement. 

Borrower will maintain exclusive control over the occupancy of the Property, including short-term rentals, and will not subject the Property to any timesharing or other shared ownership arrangement or to any rental pool or agreement that requires Borrower either to rent the Property or give a management firm or any other person or entity any control over the occupancy or use of the Property.

Arrange for an emergency caretaker for the pet.Tenant agrees to indemnify, hold harmless and defend Landlord against all liability, judgments, expenses (including attorney fees), or claims by third parties for any injury to any person or damage to property caused by Tenant’s pet.Landlord will take dated photographs of the house and each room.Landlord reserves the right to revoke permission to keep the pet should Tenant break this agreement or provide false or misleading information.

I would plaster their crappy photos all over the internet, yelp reviews, etc.the threat of bad reviews and lawsuit can help the LL end this arrangement without additional loss, regardless of what the contract states.

I left the phone conversation satisfied that I did all I could over the phone, told him that I would love to come look at the house if he could arrange a time that would work for the tenant.

Thanks again You may need to arrange payment with the agent.

The property is just now finally being rebuilt after a terrible arrangement of issues that occurred between my insurance and the county...