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About Us

What makes us different? Our team of experienced Realtors, our commitment to the towns we serve, and our unmatched service. Peter Gutterman opened the first Sentry office in 1971. In 2012 Ben Castonguay became the President. Ben has over 45 years of real estate experience and is a member of the Connecticut Real Estate Commission for over 20 years. Ben’s industry experience and hands on management skills make him a great leader.


Sentry is an independently owned and operated company, not a franchise or mega-company, with offices conveniently located across the territory we serve. We limit the size of our offices to ensure that buyers and sellers receive full and attentive service in a friendly, no-pressure atmosphere. Sentry is a selected member of Worldwide ERC, since opening in 1971, we have helped thousands of buyers and sellers realize their dream of owning “a piece of America.”