On his death, the property transferred to his daughter, Mary Ann, the then Mrs. David Castleman, who eventually built a mansion on the horse-farm site and gave it the family name.
Under the Castlemans, Castleton Farm continued as a Thoroughbred operation, but added the breeding of American Saddlebreds and Standardbreds for harness racing.
Development by James R. Keene The original property changed hands several times, occasionally small parts being divvied up and sold to multiple different parties.
In the early 1890s, Wall Street tycoon James R. Keene acquired the farm and purchased additional land to bring the operation to almost 1,000 acres (4 km2).
[2][3] 2000s In 2001, Irish businessman and racing enthusiast Tony Ryan acquired Castleton Farm from the Van Lennep Family Trust.