In many states, abnormally high vacancy at commercial properties should mean a lower tax bill. Market transaction evidence essentially dictates this result: States that assess taxable value on commercial properties based on market value, as though leased at market rents, should allow a deduction from that value when the property incurs above-market vacancy and collection losses.
Would buyers pay as much for a vacant income-producing property as they would for an identical property that is fully leased at market rates? Of course not. For the same reason, in states that value the property as though leased at market rents, below-market occupancy should result in a lower property tax assessment.