Vancouver's tax does not grant an exemption for an "ex" principal residence. Once it has been vacant for 180 days, the tax "kicks in" even if the property is listed for sale regardlss of whether it was a principal residence or a rental. Once sold, the tax won't apply to the purchaser as of the date of sale (they get a new 180 day clock) and the vendor only pays up to the date of the sale. The only ongoing exemption I'm aware of is if the property is actively undergoing "major renovations" (planned renovations don't count. To qualify, all permits must have been issued, work must be underway, and the scope of the work must be such that the property is uninhabitable.