My main goal is it be able to retire at age 40 from my main job and work entirely on my real estate portfolio.

Playing sports isn't forever and I know a 9-5 isn't for me, I am very much desiring to get ahead and learn how to build wealth from all those smarter than me! 

If I put myself in the shoes of the outside partner/investor friend, I would be very concerned because: 1) unclear and/or potentially conflicting business plan, 2) even with clarity in the BRRRR business plan, unclear in the viability of pulling it off with these market conditions, 3) the chances of dispute seems very high, especially if you're going to live in. 4 years ago, I went through a  similar thought process when purchasing an investing property with mainly my family money, while considering an outside investor to rehab for higher STR ROI... 

I'd like to add another SFH to the business  in the near future with the main goal being grow the business as fast as possible. 

My main question is will I be happy in 10 years that I bought this property?

Now my main issue is I need a fire detection system in a enclosed back porch that leads up to all three floors, but I don't know what's the minimum I would need to be compliant or that the fire marshall is suggesting what he wants or recommends.

What’s your main focus, or what are you hoping to get out of your journey here?

Age isn't the main factor here.  

It's a game-changer where you can buy a $1,000,000 property with $35,000 down, you can build equity while keeping living costs low.2️⃣ Partnering Up:Real estate is a team sport.

Moving on was tough, but helping him make peace with that was main part of the negotiation process no one else touched on.