So, you have your choices of closed ended or open ended structures. 

I really believe that we live in a time where all the information you need to do just about anything is available for free online.

Property owners can set up their property online in minutes, without agents, lawyers, or advisors slowing them down.

This is expensive but you'll have a place to work and meet with people when you're in town that matches your online presence.

Now when your agent actually does the release then they send it to the listing agent and its is the listing agents responsibility to forward that doc to the sellers we do this all the time via docu sign or hello sign or whatever on line document system the local MLS uses.. somehow you seem to have this backwards..

The site is no longer online.

I’d suggest checking out real estate networking events (local or online) like REIAs or BiggerPockets.

I think you have no choice but to convert to cash yourself.....no one is going to take the risk/hassle of converting afterward.

Monitoring open windows isn't feasible in my case, but I can definitely monitor daily electricity usage online  

While the owner is free to sell the property and the information about how they run it as a business, AirBnB does not allow them to sell their online identity for the platform.