New York City's socialist mayor filmed himself outside a billionaire's penthouse on Tax Day like it was a campaign ad.
That billionaire just showed up at a national conference and pointed every partner he has toward the exit.
What Ken Griffin said next will make Mamdani wish he'd stayed home.
The Mayor Who Can't Stop Threatening the People Paying His Bills
On April 15, Zohran Mamdani posted a video from the sidewalk outside Ken Griffin's Manhattan penthouse – the one Griffin still owns while living in Miami – announcing a new pied-à-terre tax on luxury properties owned by out-of-city residents.
Griffin called it "creepy and weird."
He's being polite.
What Mamdani actually did was hand Griffin a megaphone and point it at every business partner Griffin has in New York.
Griffin took that megaphone to the 2026 Milken Institute Conference on Tuesday and used it.
"When we moved from Chicago, there was a debate between New York and Miami," Griffin told the audience. "It's unquestionably true that we made the right choice."
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He wasn't done.
"Now what the mayor of New York has made clear to my partners, and principally my New York partners, is that we need to double down on our bet in Miami."
Then came the line Mamdani should be reading very carefully.
"We've seen a mass exodus of business leadership from California to Texas and Florida. Mamdani's making it very clear. New York doesn't welcome success."
Griffin Already Did This Once – and New York Watched Chicago Learn That Lesson the Hard Way
This isn't Griffin's first time walking away from a blue city that decided success was the enemy.
Citadel spent more than 30 years in Chicago – one of the largest tenants in one of the city's biggest skyscrapers.
Then the city became unlivable.
Griffin watched two colleagues have bullets fly through their cars.
His own building took 25 bullet holes in the front façade. Chicago raised taxes, coddled criminals, and drove out everyone who had options.
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"Asking people to leave Chicago for New York or Miami has not been hard," Griffin said last year. The firm went from 1,300 employees in Chicago to a few hundred. From owning multiple floors of a landmark skyscraper to shrinking down to two.
Griffin is now selling his final Chicago property at a reported 20% discount – because that's what blue-city real estate is worth when the job creators leave.
New York is watching Chicago's funeral and somehow thinks it's different.
It isn't.
What Mamdani Accidentally Built Is a Recruitment Ad for Miami
Here's what Griffin actually told his partners in that Milken speech.
He said Miami is "a state that embraces business, embraces education, embraces personal freedom and liberty" and offers people "an opportunity to live the American dream, a dream of earned success, not a dream of distributive handouts that leave people dependent on government for their lives and their livelihoods."
That's not just a rebuke of Mamdani.
That's a billboard.
And Miami doesn't need billboards – Palm Beach County is already buying them.
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Actual billboards in New York City reading "Dear NYC, it's not you, it's me." The Business Development Board of Palm Beach launched the campaign the week after Mamdani won the election.
The money is already moving.
Florida's billionaire count has surged from 6 to 119 in recent years. Jeff Bezos is there. Larry Page is there.
Mark Zuckerberg is buying a $150 million compound on Indian Creek Island.
Miami now leads the nation in home sales above $50 million – not a single one sold for that price in 2020.
Citadel itself is building a 54-story glass headquarters tower on Brickell Bay, expected to cost over $1 billion, designed by the firm that built the Hearst Tower and the Swiss Re building in London.
That's what "doubling down" looks like when a billionaire actually means it.
Mamdani Thanked the Same Man He's Trying to Shake Down
The funniest – and most revealing – part of this story happened just days after the penthouse video.
Mamdani stood at One Police Plaza and publicly thanked Ken Griffin for funding a memorial wall for fallen NYPD officers.
"I also want to thank Ken Griffin for funding a memorial wall that will open later this year," the mayor said, standing in front of department brass and families of slain officers.
The same week he filmed himself on the sidewalk outside Griffin's penthouse trying to tax him out of the city.
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The mayor literally needed the man he's targeting.
That's the contradiction at the center of Mamdani's entire project.
New York's budget deficit is real. The city's $127 billion preliminary budget depends on Wall Street bonus season and the tax base Griffin and people like him represent.
Moody's changed its outlook on New York City's credit from stable to negative in March 2026, citing projected spending exceeding revenues over the next four years.
When the people funding your police memorials decide the mayor is "creepy and weird" and move their operations to Miami – you don't close the budget gap. You blow it open.
Griffin made that calculation in Chicago.
He's already made it in New York.
The only question is how many partners he convinces to follow him south before Mamdani figures out what he's done.
Sources:
- Lindsay Kornick, "Ken Griffin vows to 'double down' on Miami move, says NYC 'doesn't welcome success,'" Fox Business, May 6, 2026.
- "Ken Griffin reveals '25 bullet holes' in Chicago building drove Citadel move to Miami," Fox Business, November 6, 2025.
- "Ken Griffin set to complete Chicago real estate selloff after Citadel Miami move," Fox Business, December 7, 2025.
- "Mayor Mamdani, Governor Hochul Announce State's First Pied-à-Terre Tax," NYC Mayor's Office, April 2026.
- "'Wall Street South' Migration to Florida," Business Development Board of Palm Beach County, November 7, 2025.
- "Wall Street's Secret Migration," International Business Times, March 14, 2026.
