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Mark J. Duclos SIOR, CRE President

Mark Duclos, SIOR, CRE, is the co-founder and President of Sentry Commercial, a Hartford, CT-based commercial real estate services company. Mark has over 38 years of experience in the industry, 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. Mark embarked on his commercial real estate career in 1986 with developer and owner Indus Realty Trust, and later joined The Farley Company in 1988, representing industrial clients. In addition to his 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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