Ken Griffin Adds $38M Park Avenue Duplex to $1.5B Property Portfolio

Billionaire investor and Citadel founder Ken Griffin has acquired a roughly 7,500 square‑foot (≈697 m²) duplex at 740 Park Avenue in Manhattan for $38 million in an off‑market transaction. The purchase increases Griffin’s holdings in one of New York’s most storied co‑op buildings.

Public records and real‑estate reporting show the unit last changed hands in 2019 for about $20.5 million, meaning the recent sale reflects a near‑doubling in price over seven years. Listings and archival marketing material describe the residence as a multi‑bedroom duplex with multiple fireplaces, a private elevator landing, a formal dining room and a chef’s kitchen; transaction documents list the buyer via a limited partnership tied to Griffin.

The deal underscores the premium commanded by trophy addresses such as 740 Park Avenue, where supply is very limited and off‑market sales are common among high‑net‑worth buyers seeking discretion. Observers note that while single trophy transactions do not reshape the broader housing market, they reinforce price resilience at the very top end of Manhattan real estate.

This acquisition follows Griffin’s earlier purchases in the same building and beyond: he reportedly bought an adjacent duplex from Julia Koch in early 2025 for about $45 million, and his 2019 purchase at 220 Central Park South—widely covered in financial press—remains one of the most expensive U.S. residential transactions on record. These deals illustrate Griffin’s sizable and geographically diversified residential portfolio.

Market commentators say motivations for such concentrated purchases vary—from operational consolidation (adjacent units for staff or guest use) to long‑term capital preservation—and that off‑market acquisitions will likely remain a feature of the ultra‑prime segment. Given the private nature of the transaction, analysts recommend watching nearby comparable sales and public records for confirmation of any planned renovations or consolidation of units that could influence future value and tax assessments.