The Mansion is a state-owned property managed by the Daly Mansion Preservation Trust in partnership with The University of Montana.
While Daly lived, 1200 head of horses were kept on the Bitterroot Stock Farm. His favorite thoroughbred, Tammany, was foaled in Tennessee in 1889. Marcus bought him in 1891 for $2,500. In 1893 there was a rivalry going on between Tammany and the favorite horse of the East, Lamplighter. A race was set up for the two horses in Guttenberg, New Jersey. Daly had said, "If Tammany beats Lamplighter, I'll build him a castle." Tammany won by 4 lengths. His "castle" is located on a hill about a mile east of Hamilton. The castle also housed Daly's other famous thoroughbred stallions; Hamburg, Inverness, The Pepper and Ogden. Two flags flew on top of the castle, one the American Flag, and the other a flag of Copper and Green, Daly's racing colors.