The article touches on vacancy takes, and I think this has a similar effect. As the article says, the even if you apply a tax like this, lowering the rent would still lead to foreclosure, so won't happen. So piling a tax on top might make some revenue, and it might make some operators go bust but it won't actually directly* get the property to be occupied.

* maybe if the operator goes bust, the rents on the building can be lowered with a new property value for future loans. Then perhaps it can be occupied. But that's very uncertain, especially if this happens to a whole city at once.