In terms of the type of investment, multi-family properties often provide more income potential and risk diversification compared to single-family homes, although they might require more management. 

Follow rule #1 of investing - diversification.

That might be fine if you want the diversification.  

Reason I mention it is for diversification.

But it is a good diversification with a very low risk.

I think diversification is best.  

Diversification of your assets.

Asset Diversification: Many commercial real estate investments have high acquisition prices (think $10M+) where most people don't have access to.

I would seek out a 4plex and allocate units as follows to achieve diversification 1.

Don't forget about your long-term goals when making investment decisions, taking into account things like diversification, cash flow goals, tax considerations, and potential growth of your portfolio.