An Experienced
Team That Works
For You

Our team has extensive background in finance, operations, leasing, and acquisition of commercial properties.

We average over 25 years of industry experience, and we co-invest at least 5% in each property, aligning our interests with those of our investors.


The GSR Team

The Graham Street Realty team is passionate about real estate. It is our passion that makes us who we are.


Mark Hamilton

Mark Hamilton has considerable experience in partnership formations and operations, project planning and implementation, asset management and management oversight, landlord-tenant and rent-control issues, risk management, and zoning and building department matters. Prior to co-founding Hamilton Zanze in 2001, Mark owned his own commercial brokerage and investment business after starting in the San Francisco office of Marcus & Millichap in 1981. In 1988, he co-founded Property Resource Group (real estate brokerage) and Quantum Land Company (development). Mark’s main focus has always been locating value-add properties in changing urban neighborhoods and then re-working them into higher-quality buildings with higher incomes, improved tenant profiles, and higher resale values.


Mark earned a B.A. with High Honors in English Literature from San Francisco State University and an M.A. in English and American Literature from Brandeis University, which he attended as a University Scholar and Fellow.


Tony Zanze

Tony Zanze’s experience in real estate included capital markets, asset management, leasing, development, and investment and brokerage of multifamily and commercial properties. Tony co-founded affiliated multifamily investment company Hamilton Zanze (HZ) in 2001.


Before HZ, Tony was with RREEF Real Estate Investment Managers overseeing asset disposition. Before joining RREEF, he was manager of the San Francisco office of GE Capital Real Estate, where he handled the production of mortgage-backed securities, structured finance, and equity investments. From 1986 to 1997, Tony was with Northwestern Mutual Life Insurance Company, where he originated long-term fixed-rate loans and joint ventures.


Tony began his career as a sales investment broker with Cushman & Wakefield and holds a B.A. in Psychology from Dartmouth College and an M.B.A. in Real Estate from the University of Wisconsin.

Co-Managing Principal

Kurt Houtkooper

Kurt Houtkooper has over 18 years of real estate experience in asset management, property management, leasing, acquisition, and disposition of income-producing properties. He is also President and Chief Investment Officer of affiliate multifamily investment company Hamilton Zanze.


Kurt was previously with Tishman Speyer Properties, where he was involved in marketing, leasing, negotiating contracts, forecasting, budgeting, managing personnel and third-party vendors, and establishing asset direction of over seven million square feet of Class A and Class B office space. Prior to Tishman Speyer, Kurt was Vice President of Investment Sales at Grubb & Ellis Company, where he represented clients in the leasing, acquisition, and disposition of commercial property.

Co-Managing Principal

David Messing

David joined Graham Street Realty in June 2014 to lead and grow the commercial platform. He brings over 20 years of commercial real estate experience, having been involved as principal in over $2 billion of transactions on both the debt and equity sides.


Prior to joining GSR, David ran the special asset and commercial real estate groups for Mechanics Bank and managed the west coast commercial lending offices for both HSH Nordbank and Credit Agricole. Prior to that, he was Director of Acquisitions and Asset Management for Tishman Speyer, where he oversaw the purchase, development, and asset management of three major projects in San Francisco. During his career, David has also started two other real estate consulting and investment companies focused on distressed assets.


David is a graduate of Duke University with a B.A. in Economics and has an M.B.A. from Columbia University. He resides in San Ramon with his wife and two sons.

General Counsel

Todd Williams

Todd’s background spans both transactions and litigation, as well as experience as inside and outside counsel. He was previously an assistant general counsel at Paul Hastings, where for over a decade he focused on real estate and complex litigation and internal and external enterprise risk management. Todd has also worked at a Sacramento law firm specializing exclusively in real estate development and transactional work.


Todd completed his undergraduate studies at the University of California, Berkeley and obtained his law degree from the University of the Pacific. Originally from Sacramento, Todd currently lives in Lafayette with his wife and three kids and enjoys coaching his son’s and daughter’s soccer, rugby, and baseball teams as well as cheering for the SF Giants and California Golden Bears.

Director of Investments

Jay Snover

Jay joined Graham Street Realty in October 2017 as the Director of Investments. In this role, he focuses on sourcing new acquisitions in dynamic office markets throughout the Western United States. Prior to joining Graham Street, Jay worked at Embarcadero Capital Partners for seven years where he served as the Director of Acquisitions and was primarily responsible for underwriting and managing the firm’s acquisition and disposition efforts in multiple West Coast office markets.

Jay graduated from the University of California, Berkeley with a degree in Business Administration. He enjoys spending time at his family’s cattle ranch in Central California and camping with his wife.

Asset Manager

Andrew Mustin

Andrew Mustin joined Graham Street Realty in August 2018 as an Asset Manager covering assets in the San Francisco Bay Area. He brings over 13 years of commercial real estate experience, with roles as a commercial broker, lender and corporate real estate transactions professional.

Prior to joining GSR, Andrew oversaw a commercial real estate loan portfolio at Bank of America. Prior to that, he was a portfolio transaction manager with Charles Schwab’s corporate real estate team where he was responsible for site selection and leasing activity within Schwab’s retail branch and office network. Andrew started his career with CBRE as a commercial real estate broker where he represented clients in the leasing, acquisition, and disposition of commercial property.

Andrew is a graduate of the University of California at Davis with a B.A. in Political Science and has an M.S. in Real Estate from Florida International University. Originally from Lodi, CA, Andrew currently resides in San Francisco with his wife. In his free time, he enjoys cooking, golfing and fishing.


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