If either unit is tenanted, the Residential Tenancies Act, 2006 governs the existing lease and it transfers with the sale, so a buyer's lawyer will want copies of the lease, notice history and the security deposit record before closing. Have those ready before you list rather than scrambling once an offer arrives.
Marketing a two-family property means reaching two different buyer types at once: an owner-occupier looking for mortgage help from a legal suite, and an investor evaluating it purely on net income. The listing, photos and pricing strategy should speak to both rather than picking one and losing the other.
A property with a legal secondary suite and documented rental income is exactly the kind of home where public records and automated estimates undercount the value, since they see square footage on file but not verified rent or permit status, and that gap can be significant against a citywide benchmark of $444,700. Get your hand-reviewed valuation from Joel Dyck.