Augustus Cass Canfield estate designed by McKim, Mead & White c. 1902 in North Hills. Canfield was the son of Capt. Canfield of the United States Topographical Engineers and on his mother's side was grandson of Gen. Lewis Cass, Secretary of War under Andrew Jackson. He was a designer of schooners and was a prominent club and yachtsman. Canfield died in 1904 before the house was completed. His wife went on to remarry in 1907 and lived on the estate until 1915. 'Cassleigh' was later purchased by John Dennis Ryan who renamed the estate 'Derrymore'. Ryan was chairman and president of Anaconda Copper Mining Co. and president of the Montana Power Co. among numerous other positions. The residence was demolished c. 1940 and part of the property now makes up Christopher Morley Park, click HERE to see the location on google earth.