The Dupee Estate, located at 400 Beacon Street in the village of Chestnut Hill, Newton, Massachusetts, was the last home of Mary Baker Eddy, the founder of Christian Science.

[4] A major renovation of the mansion was undertaken in 1907–1908 to the designs of Chicago-based architect Solon Spencer Beman, in preparation for occupancy by Mary Baker Eddy and her executive staff and household helpers.

(Beman had previously been the architect for Eddy on the design of the Extension of the Mother Church in Boston, as documented in Paul Eli Ivey's Prayers in Stone.)

In April 2006, the church announced it would sell the house as part of an overall plan to reduce its involvement in managing real estate and to instead focus on its "spiritual priorities".

[5] In December 2006 Longyear Museum, an organization dedicated to "advancing the understanding of the life and work of Mary Baker Eddy" and which owns several houses associated with her, purchased her last home from the church for $13,301,027.