Graham + Sibbald head of residential passes on the baton

Graham Tonner steps down after 26 years with adviser

From left to right: Dominic McCormick, Chris Hunter, Graham Tonner and Gavin Miller (Graham + Sibbald)

CoStar News

December 8, 2025 | 12:50 P.M.

Graham Tonner, Head of Residential, has announced his retirement from Graham + Sibbald after 26 years with the business.

This news story is available exclusively to CoStar subscribers.

Watch the video to learn how you can access industry leading CRE news and the data analytics you need to drive success.

This news story is available exclusively to CoStar subscribers.

Ready to Learn More?

Already A Subscriber? Sign In