In this case, the easiest action to take is small claims court.

I've come across a couple of different networking events & meetups, but nothing that's similar to how a mastermind group would function in terms of keeping all group-members accountable. 

Do you know that after you win in court a writ of eviction, what happens next is mostly county policy, not state law? 

Use the search function, there are lots of posts that discuss peoples experience w/ auction.com  Seems like most people were happy despite some strict timelines they try to impose.

The updates are mostly to aircover policy and procredure, but there are some other tiny functionality changes in the way things are listed and in backend work.

The judge ruled in my favor for both possession and money due (including court costs). 

For much of the time I could not as eviction court in this city was not even occurring.Because we have received the full benefit of the STR rentals prior to COVID, we are in a position to be able to absorb the $75K in lost STR rents. 

My goal is to scale this to the point where the money that he has committed has quadrupled, we have a functional company with employees, and we're able to continue to grow throughout the years.

I would recommend doing the same, putting the ball in their court by making them aware of what needs to change really clears you of feeling bad when it doesn't work out and you have to walk away. 

The property management fee covers all of the back office functions that the property management company provides (ex. accounting, marketing, supervision, etc.).