I contacted Zillow about this issue but received no response.

The problem (as you have cited) is trying to understand what you need (you don't know what you don't know), where to get it, qualifying its source(s), and the validity and usefulness of all that.Pardon me if I've gone into this too much, but I meet many people with the same concerns that you are voicing and this is offered, as much as possible in direct response to your post.Please feel free to contact me if you have any comments or questions. 

Contact a couple local PM’s.

A 20 room inn, a restaurant, a booking site with info and the land.

Those companies you asked about are more for deal finding and direct contact to off-market sellers, is that what you are looking for? 

Hope it's still enough info to give advice. 

So, a couple of years down the road, your seller gets tired of being on the loan and contacts the bank to get off of the loan. 

Going to their customer service call back calendar shows the 1st appointment when they will contact you by zoom is in 4 days.  4 days???   

So I stop and say "great, that's good info.

I have luckily not had to contact them often but when I have, they have been incredibly helpful (every now and again I get someone that doesn't know what they are doing but no more so than any other call center I call).