I would do everything in my power currently to buy a 3-plex. If I had the cash, I would pull every string possible to get one.
The more units/roof you have the easier and better it is. 3-plex is still residential mortgage/property tax/utilities/etc...so MUCH easier.
4+ and you're into commercial territory, and it's a pain.
Buy it..
236 Forest Hill Drive, Kitchener Ontario
I am 99.999% certain my landlord is the flipper.
One day maybe I can afford 246 Edenbridge Drive, Toronto, ON