If the seller is trying to avoid legal issues with the city for illegally operating a property I would get out of that.

We are also on Booking.com, Google Vacation Rentals, Marriott Homes and Villas, and more via a channel manager but some will not approve without a certain number of units.  

Now I'm being told that because of the charitable contributions listed on the corporation paperwork we need to submit a full appraisal to the state and that the state attorney general needs to approve the sale.

Keep in mind if approved, you will only be able to turn on once for a max 72 hours so coordinate the appraiser if applicableYou bare all the costs of turn on and turn off costs with the utility companies. 

As an investor, you'll need to wait until this period expires before your offer will be considered.Additionally, Freddie Mac may require proof of funds or a pre-approval letter with your offer, and they often prefer cash offers or conventional financing.

Here in Michigan you need to be licensed as a real estate agent or broker to be legal.

Is this even legal?

And when you do a lease for MTR, you'll need to put that in the lease in case they stay through high season, spelling out exact prices for each calendar month, so there is no confusion and it is legally enforceable. 

An LLC is useful for two things: anonymity and legal protection.

Purchase price: $330,000 Cash invested: $15,000 Legal 3 Flat (that was not for sure in the beginning).