generated from the agistment of horses on cleared land on the northern slopes of Mount Trefle towards the rear of Greycliffe. The management of the Park was altered in 1950 when it was combined with Vaucluse Park to become Nielsen-Vaucluse Trust. This Trust management the park for another 17 years until it was transferred to the care of NPWS in 1967. Several early Trust-era structures including a rotunda, dressing sheds, swimming enclosures and the ferry wharf were gradually removed across the period for a wide range of reasons including weather events and changing requirements of the site. Greycliffe House was located on a separate lot and was not included in Nielsen Park until 1970. The Sydney Harbour National Park was established in 1975 and Nielsen Park was included a few years later. Infant Care The NSW Ministry of Health established the Lady Edeline Hospital for Babies in Greycliffe house in 1914 under the direction of the Baby Clinics, Pre-Maternity and Home Nursing Board, mainly to treat gastroenteritis. The harbourside location and fresh air were considered optimal for the recovery process. The facility was named for Lady Edeline Strickland (née Sackville), who championed the cause of infant care. It was only the second hospital established in Australia specifically for infants under the age of two years. Greycliffe House was altered and added to during the 1920s for hospital purposes, including enclosing the house's northeast verandah, construction of large timber-framed verandah on the north, construction of a single storey room at the east end of the stables block and construction of a small enclosure and toilet on the south of the house. Greycliffe's interior was also adapted but documentary records to date do not evidence these changes. Documents record that in 1923 the hospital was housing 35 patients, 13 nursing staff and 10 household staff. As improved health and hygiene standards lead to a decline in infant mortality the Lady Edeline Hospital for Babies was closed in 1934. At this time the Tresillian Mothercraft Training School was established at Greycliffe House to provide training for nurses and a place where mothers could learn appropriate care for their babies. It was the third Tresillian facility established. In 1939 a new building, Margaret Harper House, was built behind Greycliffe to service the Tresilian Facility. It features a series of enclosed verandahs around a courtyard and was originally linked to Greycliffe House. The building is