Originally Posted by smyles
The very first Google link
reveladed that this tax has been around since 2011 at least, so it looks like the landlord failed to collect.
Based on this, it's the landlord's fault for being an ignorant to property tax law. To me it seems he is "asking" for this because it'll be a huge hit on him, but since it wasn't in your contract and he did not notify you when the tax first started, you're not obligated to pay him anything.
But, like I said, you could find yourself out of a place to keep your car safe soon, so be ready to deal with the consequences of putting up a fight.