Dodge expanded the house at "Hartley Farms", which initially had been used as a country retreat associated with his family's charitable organization, "Hartley House" in Manhattan. After it became his residence, he added two wings and some interior enhancements to the house as well as secondary living quarters, barns, stables, and a polo field. The property has been preserved with a conservation easement and his residence has been listed on the National Register of Historic Places. At one time "Hartley Farms" extended for a thousand acres (4 km2).