ownership of Harrington Park began when William Rudd Senior purchased the property on 6 March 1874. It still retained the triangular shape created after the sale of the northern section to John Campbell in 1829, comprising the 889 acres of the original Harrington Park together with the southern addition of the in Lot 1 of the Orielton Park subdivision. William Rudd Senior was a grazier who owned Houlong Station on the Lower Murrumbidgee. It appears that this family originated from Campbelltown as Carol Liston includes William Rudd's sons, Isaac and James in her list of Campbelltown families who held squatting licences between 1847 and 1850. According to Liston, a significant proportion of the Campbelltown farmers were ex-convicts who owned small holdings. Whether this was true of the Rudds or not, during the squatting era, it was common for established farmers and graziers to send their sons out into the hinterland to build grazing properties. It was also customary for graziers to move closer to town in their more mature years leaving their sons to continue to work their country estates. In such cases there could be a continuing connection between the grazing runs and the home in town or, in this case, close to the city. William Rudd died in 1885 leaving Harrington Park to his wife Emma for the remainder of her life, and then to his married daughter, Elizabeth Britten who was to hold the property in trust until her children Walter and Emma Mary Harrington Britten reached the age of 21. At the time of William's death, Harrington Park comprised . Unusual for the district, its main livestock were 350 sheep and it also carried 40 cattle and 5 pigs. There was no dairy herd although dairying was emerging as the main farming activity in the Camden-Campbelltown area at this time. Major renovations were made to the house in the 1890s and a new drive was created which passed an ornamental pond and entered through a picket-fenced gateway to the garden on the east of the house. A photograph taken during this period indicates the tall shrubs in the garden bed next to the verandah had been removed but the still current Cupressus sp. to the rear of the house are mature. Pedestals were constructed at the foot of the verandah steps. Changes that the Rudds made to the house in the late nineteenth century include replacement,