The only thing that would concern me would be if you were related parties. 

And is it possible to clear willingly transfer interest to the other party to refinance under one person's name or LLC? 

The lender we used at the time had specific requirements around second homes, mainly that it couldn't be rented out for more than 180 days, that it couldn't be under 3rd party property management, etc.

If you can ignore that part I would appreciate it.

It's fairly common for parties to include only a property address in the contract... when what they need to do is provide all Tax IDs associated with the transaction.

A lot of changes were made post Great Recession and one of those is that a 3rd party service is used to connect the appraiser with the lender. 

And the landlord doesn't want to pay for us to have our own agent since his wife is one and thinks she will represent both parties... not easy people to work with.

From there you can learn whether you like having a 3rd party manager in place, or if you would prefer to be more hands on. 

Might be able to agree to a resolution between the parties, but if not, I would get it document with the authorities. 

The most important part is that it shows you where to find your state laws!