Kevin O’Leary blasted New York Mayor Zohran Mamdani‘s proposed pied-à-terre tax as “really stupid,” arguing that owners of luxury second homes bankroll construction work, keep paying ongoing property-related costs, and don’t strain city services when they’re absent. His comments land amid a high-profile clash in which Ken Griffin‘s opposition to the proposal escalated after Mamdani spotlighted the Citadel CEO’s Manhattan penthouse in a campaign-style video.

In a post on X, O’Leary criticized the tactic of filming outside a private home, saying it raises personal safety risks and reflects poorly on the politician involved. He also framed the issue as more than taxes, pointing to the consequences of publicly identifying where someone lives.

Why O’Leary’s Critique Could Shift Investments

OLeary’s central argument was economic: he said buyers who put $5 million into a pied-à-terre set off a chain of spending that supports union labor and a wide range of trades. In his telling, the buildout work and interior upgrades can translate into “thousands, if not tens of thousands” of jobs.

He added that once those homes exist, owners keep paying maintenance and property taxes while using little to none of the city’s day-to-day resources because they are not full-time residents. In that framework, he contended the city should welcome more of these owners rather than discourage them.

The political flashpoint involves Mamdani and Griffin, after Mamdani recorded a “tax-the-rich” message outside Griffin’s 220 Central Park South residence on April 15. The home is a $238 million penthouse that Griffin bought in 2019, a deal that set a U.S. record at the time.

Mamdani’s push includes a proposed annual surcharge aimed at high-end residences that are not a primary home, with the threshold described as luxury second homes valued above $5 million. Supporters pitch that as a way to raise city revenue and deter apartments from sitting empty.

Is New York Losing Its Financial Edge?

The dispute has also spilled into major corporate planning tied to Midtown development. In a Thursday email reviewed by The Wall Street Journal, Citadel COO Gerald Beeson warned the firm might not move forward with a $6 billion redevelopment at 350 Park Avenue.

That project has been projected to create 6,000 construction jobs and underpin more than 15,000 permanent roles. OLeary’s criticism of the pied-à-terre tax echoes those job-centric stakes, even as his own post focused heavily on the labor and tax flow tied to high-end second-home ownership.

Beeson also highlighted the scale of Citadel-linked payments to the region, writing that over the past five years principals and employees, including nonresidents, have paid nearly $2.3 billion in city and state taxes. He noted Griffin has directed $650 million in charitable giving supporting New York City.

Citadel employs roughly 2,500 people in New York City, but Griffin moved the firm’s headquarters from Chicago to Miami in 2022.

Addressing Affordability Through Health Initiatives

This push for a pied-à-terre tax comes as new initiatives are being introduced to tackle broader affordability issues in New York City. Recently appointed Health Commissioner Alister Martin emphasized the importance of addressing medical debt, which affects nearly three-quarters of a million adults in the city, as part of a comprehensive plan to improve affordability and public health to improve affordability.

This reflects a growing awareness among city officials, including Mayor Mamdani, of the interconnectedness of housing and health costs. As the city grapples with these financial pressures, the potential impacts on major developments, like Citadel’s $6 billion project, continue to come into focus.

How Luxury Taxes Threaten Local Job Growth

O’Leary’s post argued that the city’s policy calculus is backwards, because the same class of buyers targeted by the pied-à-terre tax can be a steady source of construction demand and recurring payments tied to property ownership. He also criticized the optics of calling out an address on camera, tying it directly to safety.

The campaign video and the proposed surcharge have turned a debate about vacant luxury housing into a broader test of how New York treats mobile wealth and employers. With Citadel already having shifted its headquarters to Miami, the fight over a second-home tax is now intertwined with whether large projects like 350 Park Avenue proceed on schedule.