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Dennis DeSantis | Colliers | St. Louis - Clayton

Dennis DeSantis


Executive Vice President

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Professional Summary

Since 1974, Dennis has been actively involved in the commercial real estate business working as an appraiser, property manager, broker, and consultant. With this eclectic background, Dennis serves both occupier and investor clients leading them through complex leasing and sales transactions.

As an Executive Vice President with Colliers St. Louis, his experienced, results-driven approach has made him a trusted leader and advisor for clients and colleagues. Concentrating his efforts on the local office market, Dennis has advised clients through some of the largest transactions in the St. Louis region. He has received several accolades throughout his career and continues to be an industry leader due to his energy, creativity, and market insight.

Prior to joining Colliers, Dennis was Senior Director and Principal at Gateway Commercial, an affiliate of Cushman & Wakefield in St. Louis. During his time at Gateway, Dennis worked with several large, investor and occupier clients such as Ernst & Young, Pfizer, Jacobs Engineering, BJC Health System, RREEF, TIAA, FedEx, Centene, GMAC, Citicorp Real Estate Inc., THF Realty, and Saint Louis University. He has worked on investment sales, disposition and leasing and tenant representation assignments ranging in size and complexity.

In addition to his industry involvement, Dennis contributes his time and talents to various community organizations. He is a past board member of the White House Retreat, Chesterfield Arts Board, Missouri Growth Association and currently serves on the Property and Finance Committee of the Archdiocese of St. Louis.



  • SIOR St. Louis Chapter “Largest Intra-City Transaction” Award (multiple years)
  • Midwest Real Estate News Commercial Real Estate Hall of Fame (2011 Inductee)
  • Society of Industrial and Office Realtors “Largest Dollar Volume Office Transaction” National Award (2010)
  • SIOR St. Louis Chapter – Member of the Year (2007)
  • SIOR St. Louis Chapter “Office Deal of the Year” Award (multiple years)


  • University of Missouri-Columbia, BS in Business Administration with a major in Real Estate and Finance

Memberships & Involvements

  • Society of Industrial and Office Realtors (President, St. Louis Chapter - 1994)
  • The Counselors of Real Estate
  • St. Louis Metropolitan Board of Realtors Commercial Division (Director 1997-2001)
  • Missouri Growth Association - Former Board Member
  • Archdiocese of St. Louis - Real Estate & Finance Committee


Ernst & Young, Pfizer, RREEF, TIAA, Fed Ex, Centene Corporation, GMAC



Mixed-Use Properties

Service Lines

Landlord Representation, Tenant Representation, Capital Markets

Property Type

Office, Industrial, Multifamily

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