New York City homeowners now have an additional month to document their primary residency and avoid Mayor Zohran Mamdani's newly enacted pied-à-terre tax, a deadline extension prompted by widespread confusion over a publicly posted tax roll that swept up far more properties than anticipated.

Versions of a pied-à-terre tax have circulated in New York policy circles for over a decade, with prior proposals repeatedly stalled in the state legislature. Comparable levies on non-primary residences are already in effect in cities such as Vancouver, which introduced an Empty Homes Tax in 2017, and Paris, which has progressively raised taxes on second homes since 2015.

Last week, the city's Department of Finance (DOF) released a comprehensive public real estate listing containing full names and addresses for more than 960,000 properties across the five boroughs, tied to the state's new non-primary residence tax. The pied-à-terre tax — approved by state lawmakers in May under Governor Kathy Hochul — applies to non-primary residences valued above $5 million, as well as condos or co-ops valued at $1 million or more. Original estimates projected that 13,000 to 31,000 properties would fall under the levy.

"That's the difference between precision and accuracy. I would expect some inefficiency rolling out any municipal initiative at this scale," said David Arditi, founding partner of Aria Development Group, in remarks to Fox News Digital. "But when your list comes in 30 times bigger than what was estimated, city officials need to give homeowners real clarity on who's actually impacted and why."

Several prominent public figures, celebrities, and local officials appeared on the tax target list, including U.S. Secretary of Commerce Howard Lutnick, President Donald Trump's niece Mary L. Trump, film director Woody Allen, longtime Vogue editor-in-chief Anna Wintour, actress Cynthia Nixon, New York City Councilwoman Gale Brewer, and Staten Island City Councilman Joe Carr.

As the city works to resolve rollout issues, real estate industry leaders are warning that policies aimed at high earners could ultimately harm working-class New Yorkers if tax revenue migrates out of state. New York's budget relies disproportionately on personal income tax from its highest earners, a fiscal structure that makes the city especially sensitive to out-migration among affluent residents.

"Policymakers need to be honest about the trade-offs and what drives the local economy," Arditi said. If high-earning taxpayers depart, "it doesn't just hit the people who left, it shows up much more prominently in the budget of those who will stay behind."

He continued: "Every city that leans this heavily on a small group of high earners has to reckon eventually with this possibility. New York still continues to have real staying power, but we're clearly in a moment where that's being tested."

Arditi noted that discussions about the tax have already influenced investor sentiment. "I'll leave the security implications to the experts, but I can tell you, since talk of this tax started earlier this year, I've had no shortage of conversations with people who were seriously reconsidering New York as a place to invest."

Pointing to a broader southward migration trend, he added: "The great thing about New York is there's never a shortage of buyers. Having said that, given the current political and socio-economic climate in New York City, I expect the exodus to Florida to keep gaining traction. I saw it play out myself this summer. Plenty of soccer fans from the Northeast were down here for the World Cup, and some of them were, in between matches, scouting what's available in case they decided to make the move — and that was before this list came out." Florida's lack of a state income tax has long made it a draw for high-net-worth relocators from high-tax states.

The tax's rollout has "given people pause" about living in or purchasing New York City properties, Arditi said. He pointed to data showing Miami has already outsold New York in ultra-luxury transactions this year — a shift he described as nearly unthinkable not long ago.

"The headlines from the last few months have been mixed. One story says Manhattan's top end is cratering, while another report shows it's very resilient and continues to perform well," Arditi observed. "In South Florida, though, the numbers are pretty clear. And what we're hearing on the ground matches that, as our sales teams have been fielding calls from more motivated New York buyers."