The case at a glance
| Item | Detail |
|---|---|
| Case | O’Brien v. City of New York |
| Court | Supreme Court, Richmond County (Staten Island) |
| Filed | August 7, 2026, by three homeowners |
| What it challenges | The rollout: pushing the burden of proof onto owners and publishing owner names and addresses on the supplemental roll. Not the legality of the tax. |
| Ruling | September 29, 2026, Justice Wayne Ozzi: the city’s process violated the homeowners’ due process rights |
| City response | Appealed the same night, which invokes an automatic stay. The city said it would keep implementing the surcharge under the stay. |
| Status on October 9, 2026 | On appeal. DOF’s page lists an October 13, 2026 exemption deadline. |
Sources: press coverage by Inman and The Hill, September 29, 2026, and the Department of Finance page.
What the judge ordered
The ruling told the city to cancel the notices it had mailed, to replace its roll of nearly 1 million properties with a list of only those actually subject to the surcharge, and to send new notices after an individualized initial determination (a property-by-property decision on whether the surcharge applies). The roll in question is the DOF supplemental market value roll published July 24, 2026, which the plaintiffs said shifted the burden of proof to roughly 960,000 owners.
The ruling does not decide whether the tax itself is legal. Even a complete win in this case would send the city back to redo its notices rather than strike the surcharge.
Do not let a lawsuit set your timeline.
Whatever the courts do, the deadline on the DOF page is the one you can be held to. Look up your unit’s DOF value, and talk through whether to file, lease or sell.
Milton Coste | Licensed Real Estate Associate Broker | Keller Williams NYC | 917.416.7433
What an automatic stay means for you
A stay is a pause on a court order. When the city appealed, the order to cancel the notices was paused while the appeal is decided. In practice the city said it would continue implementing the surcharge, and the DOF page still lists the October 13, 2026 exemption deadline. Press reports at the time said it was unclear how the ruling would affect the deadline. Until DOF says in writing that the deadline no longer applies, the safe course for an owner is to file. A filed exemption application costs nothing and preserves your position under any outcome.
The two other lawsuits
Two further suits filed the same week challenge the tax itself on constitutional grounds, and one of them is paid for by the Real Estate Board of New York (REBNY). I have not listed their captions or claims here because I have not verified them beyond the press reports, and I will add them when I can. REBNY was not a plaintiff in O’Brien. It objected to the valuation methodology at a July DOF rulemaking hearing.
The timeline to watch
| Date | Event |
|---|---|
| July 24, 2026 | DOF publishes the supplemental market value roll |
| August 7, 2026 | O’Brien v. City of New York filed in Richmond County |
| August 26, 2026 | City tells the court it is moving the response deadline from September 18 to October 6 |
| September 29, 2026 | Due-process ruling; city appeals the same night; two constitutional suits reported |
| Later (DOF page gives no date) | DOF page shows the exemption deadline extended to October 13, 2026 |
| November 15, 2026 | Date before which the homeowners’ lawyer says the city told the court it would not invoice |
| January 1, 2027 | First surcharge charges, if any, appear on the bill due that day |
For the plain-language version of the ruling, read my write-up of the judge’s order. For the deadline, see the notice page.
What to do while the cases run
- File the exemption application by October 13, 2026 if you hold a letter and the property is a primary residence.
- Keep the documents DOF lists. The exemptions page has the full set.
- Price the decision. The sell or lease calculator compares paying the surcharge, leasing under the exemption and selling.
Questions people ask
What did the judge rule in O’Brien v. City of New York?
On September 29, 2026, Justice Wayne Ozzi held that the city’s process violated the homeowners’ due process rights and ordered the mailed notices cancelled, the roll replaced by a list of properties actually subject to the surcharge, and new notices sent after an individualized determination.
Did the court strike down the NYC pied-a-terre tax?
No. The ruling addresses the rollout and due process, not whether the tax is legal. Two other suits challenge the tax itself on constitutional grounds.
Is the October 13 exemption deadline still in effect after the ruling?
The Department of Finance page still lists October 13, 2026. The city appealed the same night, which invokes an automatic stay.
Ready to see your own number?
The lookup is free and shows the figure on screen first. If you want to talk through keeping, leasing or selling, call or message me.
Milton Coste | Licensed Real Estate Associate Broker | Keller Williams NYC | 917.416.7433
More on the NYC pied-a-terre tax
This page is educational and is not legal or tax advice. Rates, thresholds and dates come from NY Tax Law Article 30-C (text of the statute) and the NYC Department of Finance (non-primary residence surcharge page), checked October 9, 2026. Confirm your own situation with a New York attorney or your accountant. Milton Coste, Licensed Real Estate Associate Broker, Keller Williams NYC, 360 Madison Avenue, 9th Floor, New York, NY 10017.