The rule in one sentence
A property can be exempt from the vacant building tax rate for at most 5 tax years in any 12 year period, counting every exemption category together. The categories themselves are in §42-3131.06a, and each one has its own shorter limit: up to 3 tax years for active construction, half a tax year for a permit application under review, half a tax year for a single family house for sale, up to 2 tax years for a multifamily or commercial building for sale or rent, up to 3 for probate or title litigation, up to 2 for pending development approval, and up to 2 for hardship. The exemption form guide has the table. The cap sits over all of them. Hit it and the building pays Class 3 under §47-813 no matter what else is true, until someone lives in it.
Two features of the rule do most of the damage. It counts tax years, not calendar years, and OTR bills by half tax year, so a half year on an exemption uses half a year of the cap. And it runs with the property, not the owner. The years a prior owner used are gone before the new owner closes.
Why it exists
The exemptions are bridges. Each one describes a reason a building is empty that the District accepts as temporary: it is being renovated, it is for sale, the estate is in court, the owner is in the hospital. Without a cap an owner could chain them. Two years for sale, then a permit, then three years of construction, then a probate case, then another listing, and a building could sit empty for a decade at the Class 1 rate while it was technically always exempt. The cap says the bridges together are 5 years long, and after that the only status the District recognizes is occupied. The late renewal article makes the same point from the registration side: the durable fix is a resident, not another form.
Counting what a property has used
The count is not printed anywhere an owner can simply read it. It has to be assembled from the DOB record and the OTR account, and the two do not always agree. Our method:
- Start twelve years back from the current half. Anything older than that has dropped out of the window.
- Pull the DOB history for the lot: every designation notice, every response form, every exemption granted and its category and dates. Owners can request their own file; buyers need the seller to request it or to use the public record.
- Pull the OTR billing history for the same halves and mark each half as Class 1, Class 3, or Class 4. A half billed at Class 1 while DOB shows the building designated is a half where an exemption was in force, whether or not anyone remembers which one.
- Add the exempt halves. Divide by two. That is the years used. Subtract from 5.
- Check the per category limits separately. A building with 2 years left under the cap and 3 years already used on construction has no construction years left even though it has cap left.
The buyer article explains why this count belongs in due diligence, and the calculation article shows how to turn the halves into dollars on a specific assessment.
Three ways owners burn the cap without noticing
- Taking an exemption that was not needed. A house with a tenant in it is occupied and uses no cap at all. An owner who, out of caution, filed for a construction exemption during a renovation while the tenant stayed in the basement unit spent exemption years on a building that did not need them. File occupied when the building is occupied.
- Starting the clock before the plan is ready. The construction exemption begins when it is granted, and a permit pulled eight months before the crew shows up spends eight months of cap on an empty house with a permit taped in the window.
- Inheriting a prior owner's years. A buyer who pays a Class 3 price for a shell and plans a three year renovation discovers that the seller used 3 years on a listing and a probate case. The buyer has 2 years of cap for a 3 year project. The contract terms in the buyer article exist for this.
What happens when the cap is reached
The building is designated, no exemption is available, and the half year bills arrive at $5.00 per $100 until the building is occupied or sold to someone who occupies it. On a $500,000 house that is $12,500 a half. Appeals on the ground that another exemption category fits are denied on the cap alone. The remaining moves are the ones that end the vacancy: a tenant under a basic business license, a sale to an occupant, or moving in. The cannot pay article covers the order of operations when the bill is more than the owner has, and the selling article covers what the status does to a closing. One thing the cap does not touch is correction of halves that were billed wrong. A half during which the building was in fact occupied was never a vacant half, used no cap, and can still be corrected and refunded.
Planning a long vacancy against the cap
- Count the years used before choosing a strategy, and again before buying.
- Spend the cheap categories first. A probate or litigation case that is genuinely pending is time the building would be empty anyway; a construction exemption on a project that has not started is time wasted.
- Close the seams. Permit application the week the board approves, permit issued before the half year bridge runs out, crew on site when the permit issues.
- Treat the last year of cap as the deadline for occupancy, not as the deadline for the next filing.
If you want to know where your building stands, send us the address. We read the DOB record and the OTR account at no charge and tell you which halves can be corrected. Correction work is a flat $1,500 per tax period corrected, paid up front, and refunded in full for any period OTR does not correct.