Because the housing predates most of Saskatoon's current permitting rules, a second suite in Buena Vista is as likely to be an unregistered conversion as a documented one, and a lender will only underwrite rental income the City of Saskatoon has on file. That gap between the two is where a seller either keeps or loses real value.
A tenanted unit falls under the Residential Tenancies Act, 2006 for notice and lease transfer, and on a home this age a pre-listing inspection, typically $400 to $600, is worth doing before a buyer's inspector raises something during the condition period instead.
Joel prices a Buena Vista multi-family property from documented permits and actual rent, not a neighbourhood average. Get your hand-reviewed valuation from Joel Dyck.