GFIs are a code-compliant method to add safety to an ungrounded circuit.

@Nathan Faucett You would have to research the local city/town codes.

Integrates with Airbnb for sending codes & automatically changes them.

I have seen a discount code come out recently which gives a very reasonable price to pay for a virtual event.  

These are professionals with additional training and a stricter code of ethics.

Equipment: sheets of plywood for all downstairs openings, tools, empty boxes for their stuff, lock sets for every door, stack of 2X4's, long screws, nails, fake security cameras, no trespassing signs with California Penal Code 602 PC, gloves, masks, trash bags...If they won't leave, call the police (who won't help you but them showing up may make squatters run).  

If they do the check the zoning, insurance, and code enforcement mentioned above.

These are professionals with additional training and a stricter code of ethics.

If you install a bathroom without a permit, then they'll take action since it involves plumbing and electrical work.The only caveat is if the work wasn't done to code.

I'm excited about what's happening and, as a coding guy, want to fill some of the gaps myself.