If looking to buy in the U.S, there are foreign national DSCR loans for 1-4 units.

I am interested in living in the basement, and renting out the upper unit on Airbnb.

I would look at the DSCR loan as the first option.By the way, I suspect you are going to be disappointed by any refi appraisals   ADUs typically appraise poorly   JADUs can lower the property value Vs having the space as part of the primary unit.  

Lastly, ADUs are allowed for NON owner occupied properties, opening this strategy up for investors who could convert a SF into two units. 

Investment Info:Small multi-family (2-4 units) buy & hold investment in Cleveland.

That means that you can buy a property with up to four units, since this is still considered residential.

Both flat and percentage base charge usually a 1 month fee to lease out the unit. 

Quote from @Tristan Kelly: Investment Info:Small multi-family (2-4 units) buy & hold investment.

Quote from @Michael Lam: Hi All, I'm an out of state investor looking to start a rental portfolio in the Cleveland area for small multi families (2-8 units).

I own a 17 unit apartment building near Minneapolis built in the 60s and wanting to implement wifi camera system and modernize the access panel (wifi managed).Any vendor recommendations?