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Mark J. Duclos SIOR, CRE President

Mark Duclos, SIOR, CRE, is co-founder and President of Sentry Commercial. He has more than 35 years of experience as an industrial specialist. He has held the SIOR designation for more than 18 years, served as the SIOR Global President for 2 years (the longest tenure of an SIOR President to date), and currently is the Immediate Past SIOR Global President.

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

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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