As for my Airbnb research, I have spoken with a person who runs numerous Airbnb’s in a different area (city atmosphere) who provided good ideas on how to smoothly run the property.

Not every lot will allow you to STR even though sevier county and the city propers do have specific zoning that allows it so you don't have to worry about them ever rescinding that right. 

As a Canadian, most of what you say regarding BC and Ontario is true due to Vancouver and Toronto being the major cities in Canada, but your immigration numbers and link to housing shortage is a bit of political rhetoric.

The city's population growth, strong rental demand, and job opportunities in tech, logistics, and military sectors make it a reliable choice.

However, to my knowledge, as of now that is not something that the city is actively enforcing against.

Quote from @Laura Morlock: I have an opportunity to purchase a very beautiful and unique property - striking century manor house directly on the river, 1.5 acres, huge detached garage/workshop, in a quaint little town 15 mins to two major cities and a little under an hour west of Toronto.I know the property inside and out, it's turnkey, and I would love to own it, but I don't know what to do with it.

Do you have a city/market in mind for these investments? 

Should you run into an issue with said tenant and need to evict or should city know you placed them in there, you expose yourself to potential fines. 

It’s a blast helping new investors like you find their rhythm and start building wealth.Talk soon,JulianTurning investment visions into REALITY in Omaha, NE - Ranked #1 city to move to by Forbes Magazine.

If you sue, and have to "prove" that the neighbor was negligent, then that would likely need to consist of multiple “written” communications from you, the city, or an arborist to your neighbor stating that you/they feel the tree in question is diseased, appears to be dead/dying, is overgrown and posing a potential threat to your property, etc.