Legal status of each additional unit is the biggest single factor. The City of Saskatoon requires permits for secondary suites, and a lender will only credit rental income from a suite that permit file supports, so two houses that look identical from the street can be worth very different amounts depending on what is on record.
Net income, not gross rent, is what actually gets underwritten. Property taxes, insurance, utility costs not covered by tenants, and a realistic vacancy allowance all come off the top, and a seller presenting only the advertised rent is leaving out the numbers that determine what a buyer can actually finance.
Existing leases transfer under the Residential Tenancies Act, 2006, so a buyer's lawyer will want those reviewed before closing. Get your hand-reviewed valuation from Joel Dyck.