Appeals Court Throws Out Lawsuit Over Mamdani's Pied-à-Terre Tax Rollout

A New York appeals court on Wednesday threw out the lawsuit over Mayor Zohran Mamdani's pied-à-terre tax rollout, ruling the homeowners who sued had not adequately shown they were harmed.

The Appellate Division, Second Department, reversed a Sept. 29 judgment by Staten Island Supreme Court Justice Wayne Ozzi that had granted the homeowners injunctive and declaratory relief. The four-judge panel was unanimous. It denied the petition and dismissed the case a week after hearing arguments.

Who sued, and over what?

Seven homeowners, represented by former First Deputy Mayor Randy Mastro, sued the city in August. They targeted the Department of Finance's publication of a supplemental roll covering roughly 900,000 properties. They also challenged the roughly 17,000 notices the city mailed to owners who might owe the surcharge. Their core argument: the city made owners prove they live in their homes instead of checking its own records first.

The court never reached that argument. It found the homeowners lacked standing — the legal right to sue — because they showed no concrete injury. Appearing on the roll or receiving a notice was not enough, the judges wrote.

What did the ruling actually say?

The court treated the notices as paperwork, not harm. The notice, court documents read, "serves an informational purpose," like a debt collection letter. The state legislature "must have anticipated that the list of notice recipients would not be exact or flawless," the judges wrote, or it would not have created an exemption process.

The panel also found the rollout confusion too "generalized, tenuous, and ephemeral" to count as an injury. The homeowners offered no evidence that anyone had misused the information. They showed no stalking, no fraud. The court noted the city's annual assessment rolls already list each owner's name, assessed value and market value.

The cost of applying for an exemption did not qualify as injury either. All taxpayers spend time and money complying with tax rules, the court said, and the homeowners had not documented or quantified their costs.

Two of the seven petitioners, Rachel O'Brien and Carmine Morano, never alleged they received a notice. The other five were exempted after the suit was filed.

The panel did side with the homeowners on two procedural points. It rejected the city's argument that exempting the petitioners made the case moot. It also rejected the argument that the tax law limits challenges to appeals before the city's Tax Commission. The court declined to decide whether the Department of Finance broke its own rule by not relying on 2024 income-tax data when it chose who received notices.

Does this settle the tax's legal fights?

No. The ruling leaves the surcharge's other legal challenges intact. Gothamist reported the tax faces three separate challenges, including ongoing cases in Suffolk County brought by what Mamdani called "some of the same uberwealthy interests whose arguments just lost in court today."

The city has also adjusted the rollout since the notices went out. After the state sent early 2025 income-tax data on Aug. 12, the Department of Finance cleared 1,210 owners and said it would send new letters to about 10,800 others. Gothamist reported DOF has now granted more than 8,800 exemption requests.

The revenue projections still diverge. Comptroller Mark Levine estimated earlier this year the tax could raise up to $380 million from about 11,200 properties. Mamdani has said it will raise $500 million a year.

What did Mamdani say?

In a statement, Mamdani said the court "rejected an attempt by the ultrawealthy to avoid paying their fair share." He added: "But owning a second home worth over $5 million should come with a responsibility to the city that makes it valuable."

He closed with a commitment to implementation: "We will implement the pied-a-terre surcharge fairly and efficiently, ensuring that those most able to contribute do their part to build a city that works for everyone."

The standing ruling removes one lawsuit but no others. With three challenges pending and exemption requests still being processed, the surcharge's legal and administrative future now rests on the Suffolk County cases.