You better try comprehending what you read: it's a tax on residences that sell for over a million dollars, which does not affect many homeowners in NYS outside of Manhattan and some other select NYC residential areas, which is why it's referred to as the "mansion tax". It does NOT apply to rents. It says nothing about being applied to commercial/investment properties. "Ordinary home owners" do not pay sales tax on their home purchases or on their rents in NYS.
I will also stand by my original statement: these projects getting tax breaks on mortgage taxes does NOT put an added burden on "everybody else" because the development/redevelopment of these properties is going to still add significantly to the tax base. However you want to spin it, a percentage of something is better than all of nothing. 100% of 0 = 0. DOH!