That Act limits how fast rent can grow on a sitting tenant: an increase on an existing tenancy can happen only once every 12 months with proper written notice, so the return you underwrite on day one assumes slower rent growth than simply re-listing the unit every year would produce.
Property tax is part of the carrying-cost side of that math, and in Saskatchewan residential property, Silverspring included, is taxed on 80 percent of its assessed value rather than the full amount, which changes the annual expense line every return calculation depends on.
A real return figure needs the specific property's rent roll and expenses run against actual Silverspring comparables, not a rule-of-thumb percentage. Get your hand-reviewed valuation from Joel Dyck.