That scarcity cuts both ways. A buyer who does find a legal duplex or triplex here faces thin comparable sales, since so few multi-family transactions close in the area each year, which is exactly the situation where a Saskatchewan lawyer and a careful valuation matter more than a quick online estimate.
What does support an investor's case is the tenant pool. Newer construction with fewer deferred maintenance issues tends to draw families and working tenants who stay longer, and steadier tenancies under The Residential Tenancies Act, 2006 mean less turnover cost than an older, higher-turnover building elsewhere in the city.
Confirm zoning and permit status with the City of Saskatoon before assuming any multi-unit setup is legal, since the label on a listing does not settle that question. Get your hand-reviewed valuation from Joel Dyck.