What kind of multiplex is best to owner occupy?

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I plan on moving from my house to some sort of multiplex in order to be closer to work. I want to do this the smart way by buying a multiplex. Currently I rent 2 out of the 4 other rooms. I want to rent all the rooms out if I move out. If I do I can cash flow around 600 on the house(on the lower end). I want to move into some sort of multi family home where I can rent out all of the units and live in the other unit. The goal is to brrr it as well. Thoughts?

What kind of properties should I be looking for in terms of size? Is there too much sq ft?