Between 1901 and 1905, C. K. G. Billings combined Chittenden's, Muschenheim's, and Libbey's properties into a single estate. On the site, he built "Tryon Hall", a Châteauesque-style mansion with a swimming pool, horse stables, a formal garden, pergolas, and a winding driveway leading from Riverside Drive. The mansion also contained boat docks on the Hudson River and a garage to house his collection of 13 automobiles. Billings lived at Tryon Hall until 1915. Immediately to the north were Abbey Inn, a summer residence built on land that Willam Henry Hays had purchased in 1842, and another estate that Walter S. Sheafer, the state geologist of Pennsylvania, had bought in 1891.