This is purely a negotiation between you and the lender. 

In addition to size you'll need to consider things like the below Apartment categories to choose from: Student Housing – Off campusSenior Apartment communityClass A, B, or C Market rate apartmentsLow Income Apartment community Class C-/DIn my opinion the best size is going to be an Institutional Grade Asset (IGA) containing 250 Units or more, Class B, or a Class C asset in a Class B area poised for repositioning the asset to a Class B product, and its a pure Market Rate Asset.

This is where you need to take things offline and find and build organic relationships with pure passive Accredited investors.

If you intend to House hack to start inquiring your rentals, you can do FHA with 3.5% down as an owner occupant, however if your first purchase is a SF purely for investment, you may be looking at conventional with 20% down or private funding.

@Gabriel MansonWell that's what we did, but we didn't even know what a BRRRR deal was at the time it was purely by accident and we had LOTS of pitfalls.I would not recommend taking that one by yourself on your first deal. 

The prior standard required parking - now additional parking is only required if you go to 2 bedrooms.The downside is that they left the requirement in that the owner must reside on-site (in the main house), so it limits usability as a pure investment/flip approach.As @Teri S. says, it may be better to try and convert to a true duplex. 

Other than needing a new roof and deck, this house renovation was purely cosmetic.

And during that time I also get tax benefits, which you don't get as a pure renter. 

But, Ohio usually is cheap (compared to many other markets) , so don't write-off properties purely because they seem too cheap.Good that you're asking these sort of questions.

This was a risk tolerance decision, versus a purely Profit/Cash outlook.