Key Takeaways
- • Pershing Square Foundation, the philanthropic arm of Bill Ackman's hedge fund, acquired two Upper West Side Manhattan buildings for a combined $260 million ($190 million for 125 West End Avenue and $70 million for 320 West 66th Street) to establish a brain research institute.
- • The planned research facility, spanning approximately 700,000 square feet, will be named The Ackman Oxman Institute and developed in partnership with Mount Sinai Hospital System, combining Ackman's surname with that of his wife, Neri Oxman.
- • The acquisition was motivated by dual personal experiences: Ackman's 26-year-old daughter Lucy suffered a brain hemorrhage in February 2026, and his wife's mother died from Alzheimer's disease five years prior, both events driving the philanthropic commitment to neuroscience research.
- • The property at 125 West End Avenue, currently home to West End Labs, has a storied real estate history, previously housing a Chrysler service facility, portions of the New York Times printing operations, and ABC/Capital Cities facilities.
- • No timeline for the institute's opening has been announced as of the transaction date in late July 2026.
Summary
Bill Ackman's Pershing Square Foundation completed a significant real estate acquisition on the Upper West Side in late July 2026, purchasing two adjacent Manhattan properties for $260 million. The foundation acquired 125 West End Avenue for $190 million and signed a contract to purchase 320 West 66th Street for $70 million, with both buildings located between West 65th and 66th streets. The combined real estate footprint will comprise approximately 700,000 square feet of space dedicated to establishing a brain research institute.
The institute, to be named The Ackman Oxman Institute, represents a strategic partnership between Ackman's foundation and Mount Sinai Hospital System. The naming convention honors both Ackman and his wife Neri Oxman, reflecting the family's commitment to neuroscience research. According to reporting from multiple sources including West Side Rag, the decision to establish this research facility was motivated by deeply personal circumstances. In February 2026, Ackman's 26-year-old daughter Lucy suffered a brain hemorrhage and was discovered alone on her apartment floor approximately 15 hours after the incident. Ackman subsequently reported significant improvement in his daughter's condition. Additionally, Neri Oxman lost her mother to Alzheimer's disease five years prior, further galvanizing the family's resolve to advance brain research.
The primary property at 125 West End Avenue is currently occupied by West End Labs, a scientific and research center. The building's provenance reflects Manhattan's industrial and media heritage, having previously housed a Chrysler parts and service facility, portions of the New York Times's dominant printing operations on that corridor, and offices for ABC/Capital Cities. This historic property's conversion to a dedicated brain research institute represents a significant adaptive reuse of Manhattan commercial real estate for biomedical research purposes.
As of the transaction date in July 2026, no formal timeline for the institute's opening or detailed operational plans have been publicly announced. The acquisition marks a substantial philanthropic commitment to neuroscience research infrastructure in Manhattan and reflects the Pershing Square Foundation's expanded focus on health-related initiatives beyond traditional hedge fund operations.
The institute, to be named The Ackman Oxman Institute, represents a strategic partnership between Ackman's foundation and Mount Sinai Hospital System. The naming convention honors both Ackman and his wife Neri Oxman, reflecting the family's commitment to neuroscience research. According to reporting from multiple sources including West Side Rag, the decision to establish this research facility was motivated by deeply personal circumstances. In February 2026, Ackman's 26-year-old daughter Lucy suffered a brain hemorrhage and was discovered alone on her apartment floor approximately 15 hours after the incident. Ackman subsequently reported significant improvement in his daughter's condition. Additionally, Neri Oxman lost her mother to Alzheimer's disease five years prior, further galvanizing the family's resolve to advance brain research.
The primary property at 125 West End Avenue is currently occupied by West End Labs, a scientific and research center. The building's provenance reflects Manhattan's industrial and media heritage, having previously housed a Chrysler parts and service facility, portions of the New York Times's dominant printing operations on that corridor, and offices for ABC/Capital Cities. This historic property's conversion to a dedicated brain research institute represents a significant adaptive reuse of Manhattan commercial real estate for biomedical research purposes.
As of the transaction date in July 2026, no formal timeline for the institute's opening or detailed operational plans have been publicly announced. The acquisition marks a substantial philanthropic commitment to neuroscience research infrastructure in Manhattan and reflects the Pershing Square Foundation's expanded focus on health-related initiatives beyond traditional hedge fund operations.
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