knighted in 1967. Following the death of his mother Lady Fairfax in 1965, Warwick inherited the historic harbour side mansion Fairwater at 560 New South Head Road, Double Bay. Owned by his family from 1900 until 2018, Fairwater became the family's permanent Sydney seat and Harrington Park its country retreat. Warwick Fairfax married three times: M. (1) 1928, Marcie E. Wilson (James 1 d.); (2) 1948, Hanne A. Bendixsen (1 d.); (3) 1959, Mary Wein (Warwick 1 d. 1 s.). Warwick Fairfax began major renovations to Harrington Park in 1957. North Sydney Architects Fowell Mansfield & Maclurcon planned the changes, and the building work was supervised by T. W. Jackson Pty Ltd. During this period a garden study was also built in a secluded part of the garden. This building was designed by Wilshire, Hodges and (Marcel) Weyland and furnished by Emery T. Reeves. Other estate buildings renovated at the same time were a cottage on Bringelly Road and the manager's residence on Northern Road. The renovations included construction of new cottages for the manager, housekeeper and gardener and a glasshouse was added to the garden. Local contractors regraded the entrance road and constructed a bridge over the creek. Other additions were a new dam, pig yards and a children's cubby house. Changes to the Fairfax Board in the early 1960s allowed Warwick Fairfax more time for private and intellectual pursuits. In his new study at Harrington Park he wrote The Triple Abyss: Towards A Modern Synthesis. Published in London in 1965, this book explored major world religions and synthesised them into a liberal view that explained his own philosophy. After his third marriage (1959), Fairfax spent more time at Harrington Park with his family and devoted more time to his writing. At the same time he was also engaged with company affairs and orchestrated coverage of the electoral campaigns, continued to take a keen interest in electoral campaigns and other issues editorialised in the Herald. In 1966 Warwick Fairfax expanded the property with the purchase of the Funnell's property that straddled Campbell's Portion 60 and Molle's Portion 59. In 1967 two pavilion style rooms (master bedroom and retreat) were added to the northern side of the house. Changes to the estate since 1980 In 1981, Camden Council approved in principle the residential subdivision and development of the Harrington Park estate. By the mid-1980s the house knoll was largely treed