The peak for asbestos usage was the late 1970s, but it was used in many common building materials up through the middle 1980s, and is still legal, although not widely available, in many materials.

@Amanda Jacobellis any more usage updates for STESSA?

Timeshare is a form of ownership.Airbnb/Short Term Rental is a type of usage. 

I've had to deal with tenants flushing down all kinds of inappropriate type of stuff, which has led to serious leaks and back-ups.

The most amazing thing I have seen is how much the water usage drops per month overall when the tenants are responsible for the water.

He may be applying issues with STRs in some jurisdictions to the entire state which may be inappropriate.  

Won’t do coin operated.I had never considered providing the units and just up-charging for usage. 

Lastly, log onto your water acct, it will track hourly usage, see if there is a spike, but again, 100 bux a month is not high, well maybe a little. 

The city has cited him with a cease and desist for the short-term usage of this property.

Before you put any significant effort into this, you should reduce your understanding of how to acquire the land in writing with your in-laws.Once you have site control, you can contact developers, contractors, and realtors to gather data needed to determine usage, and value and seek validation from the permitting authorities about what can be built on the site as-is or with a zone change.If you do get into this process, the most important issue for you should be to be able to answer your #1 question, which is "How much value would getting a site approval plan add?'