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Mark J. Duclos SIOR, CRE President

Mark is the President and co-founder of Sentry Commercial. Since 1986 Mark has represented local, regional and national companies providing experienced, unbiased, expert advice on their real estate and facility needs. He holds the prestigious SIOR (The Society of Industrial and Office Realtors) and CRE (The Counselors of Real Estate) designations. Mark is President of SIOR and chair of its Board of Directors.

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


  • Consulting, Corporate Services, Tenant & Buyer Representation, Sales & Leasing


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


  • Society of Industrial and Office Realtors:
    – Board of Directors of SIOR Global
    – President-Elect SIOR Global
  • Licensed real estate broker in Connecticut and Massachusetts
  • REFA Member, Past President

Affiliations & Interest:

  • Hartford Foundation for Public Giving
  • REFA
  • SIOR
  • Counselors of Real Estate
  • Junior Achievement
  • South Windsor Girls Lacrosse
  • CT Chapter US Lacrosse
  • It’s All About the Kids


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