New York appeals court dismisses challenge to Mamdani’s pied-à-terre tax rollout

A New York appeals court on Nov. 4 reversed a lower-court judgment that had granted seven homeowners relief over Mayor Zohran Mamdani’s pied-à-terre tax rollout, dismissing their case because they had not shown concrete injury. The unanimous panel’s decision removed that judgment in this lawsuit, while separate challenges to the surcharge continue.

Why the homeowners’ case was dismissed

The homeowners challenged the Department of Finance’s publication of a supplemental property roll and notices mailed to owners who might owe the surcharge. Fortune reported that the roll covered about 900,000 properties and the city mailed roughly 17,000 notices. The appeals court said appearing on the roll or receiving a notice did not, by itself, establish harm. It described a notice as informational and said lawmakers anticipated that some recipients would not be liable, given the exemption process.

The court’s decision turned on standing: whether these plaintiffs had shown a concrete injury giving them a legal basis to sue. It did not decide whether the city followed every required procedure. The appeals court also rejected two arguments by the city: that the exemptions made the case moot, and that the tax law required the homeowners to bring their challenge through the city Tax Commission.

Other challenges to the surcharge remain

The appeals court did not decide whether the Department of Finance violated its own rule by failing to use 2024 income-tax data when selecting notice recipients. Gothamist reported that separate legal challenges include disputes over the rollout and claims that the surcharge discriminates against wealthy residents. The Nov. 4 ruling addresses the homeowners’ standing in this case; it does not resolve those other disputes or the tax’s overall constitutionality.

Mamdani welcomed the decision in a statement, saying it rejected an attempt by wealthy property owners to avoid paying their fair share, Business Insider reported. Randy Mastro, the homeowners’ lawyer, criticized the reversal in a statement to Business Insider, calling it “a shame.” Business Insider said the surcharge targets second homes worth more than $5 million.