New Yorkers battling Mamdani’s pied-a-terre tax snag big legal win — as casino mogul Steve Wynn joins fight

Mayor Zohran Mamdani’s administration was dealt a blow Tuesday as a judge ruled the city must scrap its bungled rollout of the new pied-à-terre tax and start anew.

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The decision by Staten Island Supreme Court Justice Wayne Ozzi is a major setback for one of the mayor’s signature policies – and comes as casino mogul Steve Wynn and former Commerce Secretary Wilbur Ross joined the legal fight to halt the tax.

Ozzi ruled the city was both “arbitrary” and “capricious” when it mailed notices to more than 1,000 New Yorkers who were not actually subject to the tax on luxury second homes in the Big Apple.

Homeowners who received the bogus notices were “substantially harmed and penalized needlessly” by having the “burden” of proving to city officials that they should be exempt, the judge wrote.

Ozzi found that all roughly 17,000 notices sent out must be “cancelled,” and the city Department of Finance must start from scratch and resend them individually.

The tax, approved by Gov. Kathy Hochul and the state Legislature, is meant to apply to 1-to-3 family homes worth at least $5 million and co-ops and condominiums valued at $1 million or more that are unoccupied, non-primary residences.

Randy Mastro, who filed the suit on behalf of Staten Island homeowners, hailed the decision — which the city will likely appeal — as a victory.

“We’re gratified that the court has recognized we were right all along. The fact is that this administration failed to follow state law when it burdened New York City homeowners with proving they live in their own homes or be on the hook for paying a new surcharge,” Mastro said.

“Now the administration must go back and do what it should have done from the start: use all the information at its disposal to make an individualized ‘initial determination’ about who truly owes this surcharge before demanding that they pay it.”

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The Mamdani administration said it planned to appeal the ruling. The city has said that the tax would raise more than $500 million a year to help fund schools, libraries and other essential public services.

Mastro also filed a new lawsuit Tuesday in Suffolk County, challenging the law on behalf of a different group of homeowners and a Big Apple co-op corporation who argue the pied-à-terre tax violates the state constitution.

Wynn and Ross, whose main residences are in Palm Beach, Florida, separately filed suit, also in Suffolk County, on Monday, claiming that the tax was “unconstitutional.”

Wynn received notice in July that he was due to pay a $183,000 surcharge on his Manhattan property, the state suit claims.

Ross said in court papers that he received a similar notice that he was due to pay $83,000 under the new policy.

Hochul ripped the two uberwealthy businessmen as hardly “sympathetic figures”– echoing Mamdani’s harsh words toward hedge funder Ken Griffin, whose $238 million penthouse Hizzoner posed outside of while announcing plans for the new tax earlier this year.

“When Steve Wynn and Wilbur Ross cast themselves as sympathetic figures over paying their fair share on multimillion-dollar second, third, fourth or fifth homes, they make the case for the pied-à-terre tax better than we ever could,” Hochul wrote in a post on X Tuesday.

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— Additional reporting by Matthew Fischetti