If you want out of a contract I suggest you to speak to an attorney, and ASAP before you burn through any contingency timelines.

On my last house I sold I opted to do it myself and wanted to burn the house down by the end.

Landlord type homeowner's insurance does not cover any contents, so if all of your furniture was stolen or burned in a fire you'd be out of luck, unless you have an STR supplement.Also as @Scott V. mentioned, say you rented to someone and they had a huge party at your house and caused a bunch of damage and you didn't tell the insurance company ahead of time that you were using the house for STR - I would think they would either find a way to not pay the claim or else non-renew you.  

Helen you should listen to David's advice unless you want to trip over dollars trying to pick up pennies.You could get BURNED not doing proper due diligence.  

The fines for that are steep and the possibility of you getting burned should you bring a buyer to the tale are immense.

Burn after reading: Sounds like you need a new broker.

The second thing (that more people know about) is you can call your local fire department and they will burn down your home to use it for training.

@Ryan Cartier this is always the burning question for people trying to buy and hold who use HELOCs.  

You may find doing 3 or 4 day minimums may reduce turnover burn out.

Someone out of state (like from Irvine or San Diego) that doesn't know what raw land trades for can get burned.