I would checkout legal zoom or zen business before meeting with any of these lawyers or accountants to do it.

Hey congrats this is just like the DA who becomes a defense lawyer or an IRS agent who switch's sides and represents those being audited  etc etc..

I'll reach out to the lawyer in the meantime, but I suspect if they refuse to pay it, it'll have to come out of their security deposits when they move out?

I am not a lawyer or know the nuances of licensure law to this level.That being said, I would imagine that if you signed contracts with clients that they will pay you $5,000/mo or $250/hr, or whatever you agree on, for consulting services, that is between you and them.  

Again, refer to your lease (if reviewed by a lawyer, I hope), and your state & local laws.

He was also featured on the local news station for his innovative work.The tenant is of course taking no responsibility for any of his actions or the damage, and he mainly just throws out empty and somewhat comical threats about a team of lawyers on standby, accusations of insurance fraud, and leaving bad reviews for the property manager.

How to get a notary and real estate lawyer?

I know there are partial buyers in this group.Note & Mortgage Investing Made Simple - Matt Kelley is the admin, he's a lawyer out of CACreating Wealth Simplified through Note Investing - This is Chris Seveney's groupNote Investing Tools Members - This is run by Tracey Z and Fred Rewey...you might need to be in their network to join. 

A lot of investors don’t understand all the tools that are available to them because you would have to talk to someone that strategizes taxes i.e CPA, enrolled agent, tax lawyer etc. in order to use the short term loop hole, you must rent your STR for 15 days or more and be no greater than avg stay of 7 days.

Get the squatters out of the unit before you start reaming the PM, you want them and their lawyers on your side.