New York City Mayor Zohran Mamdani holds a press conference at the New York City Office of Emergency Management, as a major winter storm spreads across a large swath of the United States, in Brooklyn, New York City, US, Jan. 25, 2026. Photo: REUTERS/Bing Guan

i24 News – NYC Mayor Zohran Mamdani has officially introduced a controversial new tax targeting secondary residences valued at over $5 million.

The measure, designed to tap into the city’s vast concentration of unoccupied luxury wealth, is projected to generate roughly $500 million annually for the municipal budget.

“This tax is specifically aimed at the ultra-rich,” Mamdani stated, highlighting high-profile examples such as Ken Griffin’s $238 million Midtown penthouse and Alexander Varshavsky’s $20.5 million Columbus Circle residence.

While the city has yet to finalize specific evaluation criteria or the methods for distinguishing primary from secondary homes, the proposal has already become a flashpoint for economic debate.

The move has drawn sharp condemnation from billionaire investor Bill Ackman, who argued that the policy is fundamentally flawed.

Ackman contended that owners of luxury secondary residences contribute significant capital to the local economy without utilizing costly municipal services. He warned that the tax would likely trigger a corporate and high-net-worth exodus to low-tax jurisdictions like Miami, ultimately harming the city’s tax base.

President Donald Trump also entered the fray, denouncing the policy as “totally misguided” and claiming it is “destroying New York.” Trump, whose own extensive real estate holdings in the city could be impacted, argued that such taxation serves only to drive away the international investors who fuel New York’s development.

Implementation remains a significant question mark, as the tax could potentially affect nearly 13,000 property owners, including major figures like Jeff Bezos. Financial analysts point out that many of the city’s most expensive apartments are held through complex offshore structures and shell companies, making the identification and appraisal of these properties an immense administrative challenge for the city.

As the debate intensifies, the Mamdani administration faces a difficult path ahead in balancing its “tax the rich” mandate with the practical realities of New York’s competitive global real estate market.