If only this was true.

@Ryan Phelps, my apologies, I forgot there is no sarcasm font on the internet....yet.A true private lender is an individual who is lending money. 

I didn't have the capital to flip all three units at once, so I figured keeping solid renters was more beneficial than raising the rents to true market value and running the risk of getting potential problem renters - especially while I was working out of town.

I am inspired by your creativity to move from house-hack to arbitrage to multi-unit rehab to true DEVELOPMENT where you increased the # of units on a piece of land to add real value.

True story a friend told me. 

If your true cash flow after expenses is higher than inflation for this year I would hold. 

@Bob Foglia I would Invest in large syndications with tried and true operators this is a passive way to make some serious returns depending on the amount of capital you have to deploy, On a smaller scale I would probably consider a Joint Venture with someone in a market you're interested in.

Your real answer might be a mix of the techniques above, but I suspect that you will find your greatest ROI in SFH. 

Also, you can perfect your technique with minor tweaks here and there by doing one unit at a time.

I'm not sure on the true classification levels of things, but I'd say C/D for sure.