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Mack Capital
Mack Capital was founded by brothers William Mack and John Mack, whose family wealth originates from Mack-Cali Realty Corporation, a real estate...
Mack Capital
Mack Capital was founded by brothers William Mack and John Mack, whose family wealth originates from Mack-Cali Realty Corporation, a real estate investment trust they co-founded and took public in 1994. The firm operates as a multi-family office with offices in New York and Palo Alto, managing capital for the Mack family and select co-investors. Strategy spans multiple asset classes: direct real estate acquisitions and development, private credit via structured loans, hedge fund allocations, and venture capital investments in technology and life sciences. The family's real estate platform, Mack Real Estate Group, has been an active developer in the New York metropolitan area. Co-investors include institutional partners like the California Public Employees' Retirement System (CalPERS) on select real estate deals (per public record). Deployment pace is irregular, with no publicly disclosed AUM or annual deployment figures. The firm maintains a lean professional team, with most investment decisions made by the Mack family principals. The two-office structure allows separate focuses: New York handles most real estate and credit activity, while Palo Alto covers venture and technology investments. Mack Capital is structurally distinct for bridging a single-family-office heritage with multi-family-office operations, while maintaining direct investment capabilities that allow it to act as a lead sponsor on transactions rather than solely as a limited partner. This dual posture — both operator and allocator — gives it flexibility that many family offices lack.
General information
Firm type
Multi Family Office
Year founded
—
AUM
Undisclosed
Location
Region
North America
Country
United States
City
New York
Corporate office
New York, NY, United States
Additional offices
Palo Alto, CA, United States
Principals
William Mack
Founder
John Mack
Co-Founder
Sector focus
Frequently asked questions
Who runs investment decisions at Mack Capital?
Investment decisions are directed by William Mack and John Mack, who founded the firm. The brothers maintain the final call on commitments, with a lean professional team executing across asset classes. No external CIO has been named (per public record).
How is Mack Capital related to Mack-Cali Realty Corporation?
Mack Capital's family wealth originates from Mack-Cali Realty Corporation, a publicly traded REIT co-founded by the Macks. The family sold their controlling stake in 2021 to Bow Capital Partners, ending direct involvement with the company (per SEC filings).
Does Mack Capital operate as a single family office or multi-family office?
The firm operates as a multi-family office, managing capital for the Mack family and extended relatives. It has accepted co-investment capital from institutional partners like CalPERS on real estate deals but does not broadly market to outside investors (per public record).
What asset classes does Mack Capital invest in?
The firm invests across real estate (direct development and acquisitions), private credit (structured lending), hedge funds (via fund allocations), and venture capital (technology and life sciences). Real estate remains the largest allocation, reflecting the family's historical expertise.
How does Mack Capital source proprietary deal flow?
Deal flow comes primarily from the Mack family's network in real estate and finance, built over decades of development and public company operation. The firm's New York office provides direct access to real estate and credit opportunities, while Palo Alto covers venture sourcing.
Where does the underlying wealth come from?
The family wealth originated from Mack-Cali Realty Corporation, a publicly traded REIT focused on office and multifamily properties in the New Jersey and New York markets. The company was taken public in 1994 and grew to a market capitalization of over $5 billion before the family exited.
Does Mack Capital maintain philanthropic structures?
Yes, the Mack family runs the Mack-Cali Foundation, which supports education, healthcare, and community development primarily in the New York and New Jersey region. The foundation is funded by the family but operates separately from Mack Capital's investment activities (per public record).
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