 Known as Anderson House, the mansion was the couple's winter residence during the Washington social season, which generally extended from New Year's Day through Easter.After Larz's death, Isabel Anderson donated Anderson House in 1938 to the Society of the Cincinnati, of which Anderson was a member, and it now serves as its national headquarters.After her father's death Isabel Anderson purchased her father's birthplace in Contoocook, New Hampshire, a village of Hopkinton.