Zoning and permit status are two separate checks. Zoning tells you what is allowed on the lot. A permit tells you whether the actual construction meets code, covering egress windows, ceiling height and fire separation between units. Both need to check out before a lender will treat the extra units as legal rental income.
Because the area is newer, rental demand tends to come from families rather than students or hospital staff, which shapes vacancy risk differently than in an older, more central neighbourhood. That is not a reason to avoid it, just a different demand profile to model.
A home inspection, typically $400 to $600, should cover both or all three units before your conditions come off. Get your hand-reviewed valuation from Joel Dyck.