Deal Structure Advice

[Brian Wagers]

Team-

If I have found an investor (in a friend) who can invest 150k to possibly 300k at a time what would be the best way to structure deals? 

I have a 12 unit I purchased in November .  Purchased at 498k and borrowed 125k for down payment and improvements. (15% down). I have put in a new roof, parking lot, and fixed up a few units (raising rents along the way) and will be paying him back 8% on his initial investment (10k) at a total of 135k once refinanced in the next few months. 

Is this a good way to structure our deals moving forward to be able to pull it out and reinvest together in new properties or any suggestions on alternatives?  

Thanks again for the advice