What's the best way to build 1800 sq ft as an investment?

[Ellie Narie]

I might qualify for a loan which would allow me to build up to about 3000 square feet after buying land. I will build an owner-occupied multi family home, and I will dedicate 1200 square feet for myself and my family. What's the best use of the other 1800 square feet, so that I can bring in the most money? 

Should I build a duplex, and stuff as many 100sqft bedrooms as possible into the 1800 sqft unit? Maybe just have a kitchen area and have the rest be bedrooms, with no living room, and rent it out by the room? Or should I split it into 2-3 units? Perhaps do three 600sqft 3 bedroom units, again, with no living room area and rent it out by the room that way, so that it's only 3 different people sharing each unit? Or should I have "regular" units with a nice living room area? I feel like regular units would decrease my cash flow.