Seems like this would function similarly to a profit split, but might be more confusing... 

And, it should - there's no functional difference between a dwelling unit and companion unit in City of SD. 

Our front yard was purely dirt so we put down gravel and transformed the front yard into a functional area for our tenants.

There is a good post explaining this, use the search function.

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. 

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.

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.

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

If the septic tank is functioning, I would just repair the piping to it if the cost and have the septic pumped.