Art May

founder and principal

As Founder and Principal of Keystone Development Group, Art May possesses over 30 years of experience in all facets of the real estate development and construction industries. He has extensive expertise in structuring transactions, financial modeling, public private partnerships and development management. Art has managed a portfolio of projects consisting of market rate multifamily, affordable housing, hotels, R & D, and office development for various partners and clients.

Prior to forming Keystone Development Group, Art was Vice President of Development with the Kimpton Hotel and Restaurant Group, managing acquisition and hotel development in several east and west coast markets. He also served as Regional Vice President for Security Capital Group, developing extended-stay hotel studios and Vice President for SCG Multifamily Development, developing multifamily housing. Prior to these positions, Art served as Vice President and CFO for Western Development Group and project manager for a Seattle-based general contracting firm.

Art received an MBA from Stanford University Graduate School of Business and earned a BS in Construction Management, cum laude, as well as a BA in Architecture, cum laude from the University of Washington. Art is an active member of the Urban Land Institute, an Oakland Young Life committee member, a Certified Green Building Professional, and a prior board member of the Stanford Business School Alumni Association.

Grant Freeman


Grant Freeman has over 30 years of experience in the commercial real estate industry. His specialties include brokerage services for acquisitions and dispositions, as well as transaction support including financial underwriting, valuations and tenant due diligence. Grant also has expertise in asset management, project level debt and equity financing, in addition to develop portfolio feasibility. and his product knowledge spans from office, residential, hotel, retail and land development.

During his career, Grant has represented many notable clients in significant transactions and consulting engagements and was a managing director for Jones Lang LaSalle and The Staubach Company. He also served as chief financial officer of Makrar Properties. Grant earned a BS in Accounting from Pepperdine University, Malibu. He is a California Licensed Real Estate Broker and Certified Public Accountant.

Don Trainor


Don Trainor is a seasoned construction professional with a wealth of experience in the hospitality, residential and tenant improvement markets. Don’s responsibilities included oversight of feasibility studies, budgeting, hiring of architect and engineering consultants and general contractors at all phases from start to turnover to operations. Don served 10 years as Vice President of Howard S. Wright Constructors and as Regional Manager of the San Francisco office, developing a Special Projects Group focused on hotel renovations and tenant improvement. He also served as a Principal for the company’s in-house Construction Management group.

Don also served as the Vice President of Construction at the Kimpton Group where he oversaw the construction and renovation of over 20 new hotel projects nationwide. Prior to Kimpton, Don was Vice President of Skanska, formerly Baugh Construction working in Seattle, Portland and northern California. Don received his BA from Washington State University.

Sam Worden


Sam Worden is a land development professional with decades of experience in planning and building master plan developments and communities. His specialties include infrastructure assessments, design, and construction, regulatory coordination / approvals, land planning, and on-grade / elevated road construction. Sam served as Senior Director of Land Development at Toll Brothers, Five Point, and the Oakland Athletics, where he oversaw land planning of several large masterplans, including Concord Naval Weapons Station, Candlestick Park, Howard Terminal, Treasure Island/Yerba Buena Island, and Hunters Point Shipyards.

Prior to these roles, Sam served in engineering and land development positions for several homebuilders, contractors, and civil engineers. Sam received a M.S. in Geotechnical Engineering from the University of California Berkeley, an MBA from the Anderson Graduate School of Management at UCLA, and a B.S. in Civil Engineering from Stanford University.