Also research Rent legislation,  many states and towns are looking at rent control.  

Furthermore, our business created no issues for our rural neighbors (most of whom my husband has known for decades since he grew up on that farm property which had been in his family since 1886), law enforcement or county officials.

Unilaterally enforcing lease terms should be a last resort not a first choice in many situations.

If they are VERY professional, they will have their processes in writing as verification that policies are enforced equally and fairly by their entire staff.6.

I have a fully executed version of the lease with both of our signatures, so the basement language is enforceable in my opinion. 

I am on a first name basis with just about all the local inspectors/code enforcement and they are an easy bunch to work with.  

You need to be able to prove you're an expert on property condition, rental rates, ESAs, Service Animals, Landlord/Tenant legislation, etc. 

Current status of residential Austin STR regulations:STRs must continue to be licensed, as the City of Austin will continue to enforce STR regulations[7].

If the mushrooms are still visible and you aren't comfortable living there due to it potentially being unsafe I recommend contacting code enforcement: https://www.atlantapd.org/about-apd/divisions/chief-administ...

I am the type of landlord who maintain my property with high standard, not cheap with upgrades and new systems, going the extra miles to fulfill my Landlord responsibilities but I also like to enforce my bullet proof lease.