Thank you guys so much for the replies! They are really helpful. We have made a separate entrance to the basement, with fire alarms/parking, etc in place (although first time heard about egress window), and we don't have shared space with the basement (so tenants have their own kitchens and bathrooms, except we share the laundry), so based on Roy's comment, this is still within RTA I guess, so it's more in favor to the tenants (based on Denis' and Frederick's comment).
With that being said, we are very interested to know the pro&cons between renting out a basement from our primary residence vs. just regular rental units. For regular rental units, I think many comments kindly shared above still apply, although would there be some disadvantages when it comes to primary residence (besides living with others under your own roof), e.g. higher insurance costs? or somehow negatively affect our financial statement in the eyes of the banks? We are planning to put regular rental units under corporations, would that also work with the rentals in our primary? (we are concerned if we have fewer protections when we get sued?)