I'm not sure I agree. We're coming dangerously close to not being able to own anything outright without owing some tax of some type on it. I guess it comes down to where you draw the line from a libertarian perspective, but if I own a holiday home that I don't visit for a year and a half, which i've paid for fair and square, why would I pay any additional tax over and above that which I already had to pay, to purchase it, just becomes someone else deems that it is 'vacant'?
Yes, well that's the cost of living in a civilised society. And I don't see why we should be looking at drawing lines from a "libertarian perspective", whatever that is. Your right to enjoy an extremely limited resource because you are fortunate enough to be in a position to hoard land superfluous to your housing needs can and should be limited by the State, especially during a housing crisis. Do you also take issue with motor tax?