GSP DEVELOPMENT - Key Persons


Bill Debb

Job Titles:
  • Financial and Deal Analysis
As a real estate professional for over 25 years, Bill Debb provides expert market research, financial and deal analysis. His experience as a broker, project manager, and analyst, give him the insight to look at a deal from all angles, capturing both the tangible and intangible, rather than simply looking at numbers on paper. Expertise Build To Suit Commercial Construction Management Medical Multi-Family Retail Experience Projects

Geoff Dowling

Job Titles:
  • Acquisitions
Geoff Dowling has over 40 years of real estate experience in brokerage, consulting, development, corporate planning, and investment. He provides unparalleled expertise for acquisitions.

Jacki Debb

Job Titles:
  • Expert
Jacki Debb provides invaluable and expert insight into the ever changing multi-family residential market. She has a keen understanding of key trends and shifts in the landscape which allow her to identify the factors that will ultimately lead to a successful project.

John Kosich

Job Titles:
  • Head of Development
As a principal in GSP Development, and a 35 year industry veteran, John Kosich leads and oversees GSP Development's entire development team and provides the knowledge, energy, and commitment to consistently deliver as promised.

John Siff

Job Titles:
  • Finance
John Siff has been involved in the real estate industry for over 40 years, and he has arranged, serviced, sold or purchased over $3.5 billion of real estate debt and equity during this time.

Kevin Veon

With over 35 years of relationship-driven experience representing both landlords and tenants, Kevin Veon provides expert brokerage, consulting, and lease negotiation skills.

Larry Debb - Founder, President

Job Titles:
  • Founder
  • President
As president and founder of GSP Development, Larry Debb brings over 40 years of real estate construction, development, and ownership experience. He is extensively involved in all aspects of GSP Development's operations, and he is widely recognized as an industry leader for his ability to provide innovative solutions to complex problems. In 2006, Larry co-founded GlenStar Properties, which today owns and manages over 6 million square feet of high quality office space in Illinois and Texas. He served as a director of GlenStar, until his retirement in 2017. Larry has been involved as an owner of over $1.5 billion of real estate in his career.

Stephen Rankin

Job Titles:
  • Design
With over 45 years of experience, Steve Rankin provides extensive experience in urban design, master planning, site planning, and programming, as well as expertise in multiple project delivery modes including design-bid-build, design-build, and fast-tract construction.