Check it out here I think you will find it useful. https://www.biggerpockets.com/renewsblog/bp-podcast-205snowballing-single-family-houses-apartment-complexes-jered-sturm/

Would you scoop up a small apartment complex?

Also, if you really want to grow a RE Development business, you need to demonstrate excellence in housing before moving into more complex commercial projects.

I am dealing with an electric furnace now , it is not a good idea for cold winters, the tenant will be paying 200,300 plus dollars for heat ,every year you will be looking for a new tenant because they can't afford the rent and the heat bill, You have to insulate the pipes the walls the windows the doors the floors,everything to make sure no heat escape, I would have gas but the developer of the condo project installed all electric in the complex i guess because it was cheaper than installing gas.

(This can be seen from as early as kindergarten, where I took all of the cokes from my parents refrigerator and went door to door in the apartment complex selling them, 1st grade when I sold all of my school supplies in class so that I could buy a toy that I wanted, and even in high school when, due to the fact that I couldn't afford a paintball gun that I really wanted, I build a paintball club signup notebook complete with maps and rank structure and handed it to one of the most popular kids in school to get people to sign up for a small fee, would have worked if my mom hadn't found the notebook at home and got a little suspicious to say the least.)  

Mostly small multi-family but as big as 12 and 16 unit complexes. 

I met a guy this month that owns his own energy company who said he can audit your energy bills (he's done it for massive apartment complexes).

We charged extra if tenants used A/C units in their windows by the month during the summer.Large complexes adsorb the cost of heat,water, and factor that into rental costs. 

I would prefer to purchase a 3-8 unit complex.  

My husband worked for a large property management firm handling large 400-600 unit complexes.