Yesterday I reached several Fishers' City employees and a member of the Nickel Plate Review Committee none of whom had ever heard of Goodin Development. 

Quote from @Scott Bloom: You can get a commercial grade policy from major carriers where they lump the risk across multiple properties into one policy, reducing your premiums.  

The policy must provide a minimum of $[amount] in liability coverage.

Do any of these STR insurance policies cover against fire, water, wind or hail damage.

I suspect part of the reason might be because I have a no-alcohol policy for my property, which I understand might draw a lot of people away to some extent.

Would an umbrella policy cover us? 

Generally there is some coverage for vandalism, but you'll have to look at your policy to find out for sure.

This is one of the biggest things that people dont think about when they decide to skip hiring a GC.Become a familiar face with your local planning and zoning board/committee.

With regards to your example about plaster vs. drywall most insurance policies no longer will pay for the plaster whether you have a public adjuster or not. 

I came across some critical information today that I think is important to share with you:In the aftermath of the LA fires, it has become evident that some homeowners’ insurance claims have been denied or disputed because the property title was held in a trust, but the insurance policy was under the individual homeowner’s name.This serves as a valuable reminder to review your insurance policies and ensure that the ownership structure on your property title matches the named insured on their policy.