Photo — Zohran Mamdani: Own work (CC BY-SA 4.0) · Ken Griffin: Citadel Enterprise Americas LLC (CC BY-SA 4.0)
The Short Version
A public dispute developed between New York City Mayor Zohran Mamdani and Citadel founder Ken Griffin after Mamdani filmed a video outside Griffin's Manhattan penthouse to advocate for a pied-à-terre tax. Griffin criticized the video as political targeting that compromised his personal safety, while Citadel executives suggested the firm might reconsider a planned $6 billion office development in Manhattan and expand its footprint in Miami instead.
Latest Development
Griffin doubles down on Citadel's Miami expansion plans
Reports revealed that Citadel expanded plans for its Brickell real estate development in Miami, adding office space, apartments, and parking following the public tax dispute with Mayor Mamdani.
June 11, 2026 · Reported
The Beef
Chronological, newest first. Every entry cites a source.
Beef timeline
June 11, 2026
Griffin doubles down on Citadel's Miami expansion plans
ReportedReports revealed that Citadel expanded plans for its Brickell real estate development in Miami, adding office space, apartments, and parking following the public tax dispute with Mayor Mamdani.
Source ↗May 27, 2026
Mamdani states outreach to Griffin has received no response
Public statementMayor Mamdani stated in a CNN interview that his administration reached out to meet with business leaders including Ken Griffin, but had not yet received a response from Griffin.
Source ↗May 2026
Griffin publicly criticizes Mamdani's video and cites safety concerns
Public statementIn media appearances, Ken Griffin described Mayor Mamdani's video as creepy and inappropriate, alleging that highlighting his specific residence put him in harm's way.
Source ↗April 23, 2026
Citadel executive warns $6 billion NYC development could be reconsidered
Public statementCitadel Chief Operating Officer Gerald Beeson wrote to employees questioning the future of Citadel's planned $6 billion redevelopment project at 350 Park Avenue in Manhattan following Mayor Mamdani's video.
Source ↗April 2026
Mamdani films tax reform campaign video outside Griffin's penthouse
Public statementNew York City Mayor Zohran Mamdani released a social media video filmed outside Ken Griffin's penthouse at 220 Central Park South to promote a proposed pied-à-terre tax on high-value second homes.
Source ↗
Where It Stands
Active. Griffin has expanded Citadel's development plans in Miami, while Mayor Mamdani stated that his office reached out to meet with Griffin, though no meeting had taken place as of late May 2026.
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Sources
- 1.SourceGriffin doubles down on Citadel's Miami expansion plans · Jun 11, 2026
- 2.SourceMamdani states outreach to Griffin has received no response · May 27, 2026
- 3.SourceGriffin publicly criticizes Mamdani's video and cites safety concerns ·
- 4.SourceCitadel executive warns $6 billion NYC development could be reconsidered · Apr 23, 2026
- 5.SourceMamdani films tax reform campaign video outside Griffin's penthouse ·
Allegations are attributed to the party that made them and are not statements of fact.