I think raising the carbon tax and foreign buyer's tax is a better starting point.  The top marginal rate is 47.7% while combined corporate tax rate is 26% so a 1 or 2% might be okay, but anything beyond that is too much.  Now if the Tories win in 2019 (unlikely but possible) and cut both of those then they could raise further.  Another possibility is maybe a tax on secondary residences or tax on people who sell homes after owning less than 2 years to discourage flipping of homes or vacant ones.