Senior Leadership

Decades of experience, deep local knowledge and a shared commitment to our tenants, partners and communities.

Alex Zikakis

Alex Zikakis

President & Founder

Founded Capstone in 1996. Named GlobeSt.com's 'Best Bosses' and SDBJ CEO of the Year; leads the firm's investment strategy across commercial and residential platforms.

Jay Matthes

Jay Matthes

Chief Operating Officer

Oversees day-to-day operations, legal, and the firm's institutional joint venture relationships across the Capstone platform.

Jamas Gwilliam

Jamas Gwilliam

Executive Vice President

Helps lead portfolio business-plan execution, including investments, asset management, development, anchor leasing and land strategy, with more than 20 years of institutional commercial real estate experience.

Mark Hayden

Mark Hayden

SVP of Development

Leads entitlement and ground-up development, with a focus on master-planned residential and commercial projects throughout the Western U.S.

Paul Kneisel

Paul Kneisel

VP of Finance & Accounting

Directs financial operations, reporting and capital planning across Capstone's owned and joint-venture portfolio.

Gabi Davis

Gabi Davis

VP of Property Management

Recognized as a 'Leader of Influence in Commercial Real Estate.' Runs tenant-first property management across retail, office and industrial assets.

Nick Kolbe

Nick Kolbe

Director of Acquisitions

Leads the firm's underwriting and acquisitions pipeline. Named a 'Leader of Influence in Commercial Real Estate 2025.'