Mayor Zohran Mamdani has extended the deadline for New York City homeowners to apply for a pied‑à‑terre exemption from Aug. 21 to Sept. 18. The extension applies only to property owners who received Department of Finance notices containing the phrase "You may be subject to..." and need time to prove a home is their primary residence. The statewide surcharge targets secondary homes over $5 million (and condo/co‑op units valued at $1 million or more) and will apply in the 2026‑27 and 2027‑28 tax years. City updates clarified that roughly 17,000 homeowners—not the 900,000+ entries in the published roll—were mailed surcharge letters.
Mamdani Extends Pied‑à‑Terre Exemption Deadline To Sept. 18; City Clarifies Who Must Apply
Zohran Mamdani
New York City Mayor Zohran Mamdani has pushed back the deadline for homeowners seeking an exemption from the new pied‑à‑terre surcharge, giving affected owners an extra month to apply. City Hall now says those who received Department of Finance (DOF) notices containing the phrase "You may be subject to..." have until Sept. 18 to submit exemption documentation; the previous deadline was Aug. 21.
New York City Mayor Zohran Mamdani during an announcement on municipal grocery stores at a Campaign for Hunger community food distribution center in the Brooklyn on July 27, 2026.
Who The Extension Covers
The Department of Finance said the extension applies specifically to homeowners who received surcharge notices by mail and who wish to contest the DOF's preliminary designation by proving the property is their primary residence. The mayor's office and DOF emphasized that the extension is intended to give recipients more time to gather and submit proof of primary residency.
Ken Griffin, founder and CEO of hedge fund Citadel, speaks during Milken Institute Global Conference in Beverly Hills, California on May 5, 2026. Griffin was singled out by name by Mamdani as someone who would be affected by the pied-à-terre tax.
Large Roll, Far Fewer Notices
Confusion followed the city's July 24 publication of a "supplemental market value roll" that listed more than 900,000 properties. The city later updated the webpage to clarify the roll did not mean all listed units would be subject to the surcharge. A subsequent update stated the DOF had mailed surcharge letters to roughly 17,000 homeowners — and only those recipients need file an exemption application.
New York Gov. Kathy Hochul, a Democrat, stands next to Mamdani during a news conference on 2026 FIFA World Cup transportation at the MTA Rail Control Center on June 4, 2026.
"Not every property or unit listed in the roll will be subject to the surcharge. Only property owners to whom DOF sent a notification by mail are required to take further action," the city webpage says.
What The Surcharge Covers
The pied‑à‑terre surcharge, approved by the New York State Legislature in May and signed into law by Gov. Kathy Hochul on May 28, imposes an annual levy on certain high‑value secondary residences. The measure targets non‑primary homes valued at more than $5 million and will apply in the 2026‑27 and 2027‑28 property‑tax years. Individual condominium and co‑op units will be subject to the surcharge if valued at $1 million or more under the law's valuation guidelines.
Political Backdrop And Reactions
Mamdani first announced the levy on April 15 in a widely publicized video filmed outside hedge‑fund manager Ken Griffin’s Billionaires’ Row penthouse, singling him out as an example of the type of wealthy second‑homeowner the measure would target. Griffin later called the video "creepy and weird" at a public conference. Real‑estate and business groups have warned the surcharge could discourage investment in the city, but state lawmakers included it in the budget.
DOF and City Hall say they will continue to provide updates and clarifications online. Homeowners who received mailed DOF notices should review the instructions on the department’s website and consider submitting documentation before the new Sept. 18 deadline.
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