"Rosemary Hall" was built by Freeman & Hasselman around 1903. The first owner, Foxhall Keene, was a famous sportsman and polo player, he served as the captain of the American International Polo team in 1913. The 14,055 sq.ft. mansion was sold in January 2013 for $5,275,000.
Homes - Historic, Homes - Celebrity - Sports - Misc
Links: en.wikipedia.org, www.oldlongisland.com