I will plan to keep buying properties as deals arise with whatever means necessary (conventional, private lender, partnerships). 

I would tell them to buy their own security cameras and battery powered door alarms, and they can take it with them when they move out.you provide a home that has functional door and window locks.

It seems that the tank does not pressurize the water enough to functionally recover what is being used at the time.

Yield is a function of risk. 

If you do decide to do a deal together make sure to have an attorney draw up partnership documents just like you would with any other partner you are not dating.

Add in all these cost to make sure it's a functional BRRRR.Those rules aren't set in stone but those are some of the obstacles you will encounter.

it is a 50/50 partnership with a friend/colleague.  

I think there's only one thing that would make it better: Add the functionality of the calculators to the BP mobile application!!

We have a property held under an LLC partnership that manages and pays all mortgages/expenses, etc.

Use those skills, keep your standards high, and form partnerships with sponsors who you can trust in the same way that you deserve to be trusted by others who rely on your expertise.