Most cities and/or counties have a size limit so just build up to your limit and maximize usuable living space if you can or do a two car garage below with living space above the garage.

They will have the front door entrance through the common space.

I'll definitely keep that in mind when I'm looking for new property managers - I'm working on getting into the small multifamily space, and definitely don't won't do manage all of the additional units I plan on getting in the next few years!

Are the utilities set up for the additional 5 or is there just space for them?

@Ron Singh Is there vacant commercial space in the building?

Rent-by-the-room, medium-term rental, short-term rental, renting parking spaces, sheds.

Hello Levi, I am in the same situation and am putting the BRRRR strategy into place to get me into the multi-family space.

We added a second 3/4 bathroom and roughly 400 sq ft of living space in the basement.

Currently it's in an open space next to the kitchen.

In the 1960s we have seen large swats of farmland converted into single family subdivisions, which are today Milwaukee neighborhoods - we don't have any farm land available anymore inside the belt of wealthy suburbs, which their 3 or 5 acre min lot size zoning requirements (as we have in Mequon)  So space is one constraint, the cost of building is another.