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Mark J. Duclos SIOR, CRE President

Mark Duclos, SIOR, CRE, is co-founder and President of Hartford CT-based commercial real estate services company, Sentry Commercial. He has more than 38 years of experience in the commercial real estate industry, with a particular expertise in industrial real estate. He has held the prestigious Society of Industrial and Office Realtors (SIOR) designation for more than 20 years and served as its Global President for two years (the longest tenure of an SIOR President).

He started his commercial real estate career in 1986 with developer and owner, Indus Realty Trust, and began his brokerage career in 1988 with The Farley Company, representing industrial companies for their real estate needs. In addition to holding the prestigious SIOR designation, Mark also holds the Counselors of Real Estate (CRE) designation.

Areas of Practice include Consulting, Corporate Services, Tenant & Buyer Representation, Sales, and Leasing.

What is an SIOR? SIOR
What is a CRE? CRE


  • Griffin Land: 1985
  • The Farley Company: 1986 & 1989-1991
  • Hart Corporation: 1987
  • Sentry Commercial: 1991


  • American International College, B.S., Springfield, MA


  • Brokerage & Advisory Services, Property Management and Construction Management


  • Elected to American International Board of Trustees (2021)
  • Society of Industrial and Office Realtors:
    – Board of Directors of SIOR Global
    – President SIOR Global (2 years)
  • Counselors of Real Estate
  • Fellow Royal Institution of Chartered Surveyors’ (FRICS) (2019-2022)
  • Licensed real estate broker in Connecticut and Massachusetts
  • REFA Member, Past President

Affiliations and Interest:

  • Hartford Foundation for Public Giving
  • REFA
  • SIOR
  • Counselors of Real Estate
  • Fellow Royal Institution of Chartered Surveyors’ (FRICS)
  • South Windsor Girls Lacrosse
  • CT Chapter US Lacrosse
  • It’s All About the Kids


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