 The development offered then innovative features such as paved streets, curbs, and sidewalks; underground utility|underground utilities and sewer system; and tree lined parkways.Other original Harbor Oaks residents included author Rex Beach, Brooklyn Dodgers owner Charles Ebbett, industrialist Robert Ingersoll, and members of the Studebaker, Proctor, and Gamble families.On December 19, 1979, the Donald Roebling Estate was added to the US National Register of Historic Places.