Under Trimmer's custodianship, Fairford was developed to include over of vineyards – incorporating Gouais, Verdelho, Black Portugal and Grenache varieties – and various fruit trees. Henry Trimmer became a respected viticulturist, eventually taking on the role of Treasurer for the South Australian Vinegrowers' Association, although his "addiction to his own vintage" was to result in health problems later in life. During this time the house was extended and a coach house was added to the property in the 1860s – it is suggested by Dolling that these improvements may have been designed by colonial architect, (and Lord Mayor), Edmund Wright. Upon Trimmer's death in 1867, the property was passed to Trimmer's wife, Eliza Catherine Trimmer, and Edward Amand Wright, before being sold to Henry Laffer in 1876. Henry Laffer continued farming the land, although his son, Albert, chose to focus more on fruit trees than vineyards and grazing. The house was also modified during this period, with significant alterations occurring in the 1890s and again in 1923, at which point it took the form that it retains today – that of a 1920s bungalow. The Laffer family remained on the property for 112 years, earning it the new name of "Laffer's Triangle". Over the years the property was considered for a number of projects, and parts of the land have been sold to various commercial and government interests. Warriparinga has been considered as the site for a number of major developments, such as the Marion Shopping Centre and Flinders Medical Centre – the latter moved because of concerns regarding a fault line that passes through the property, while the former was repositioned further west at the urging of both the investors and the Highways Department. Projects that did go ahead included a holiday park, a (now defunct) restaurant, call centres, a science park as part of the failed Multifunction Polis project, and the Sturt police station. Three of the recent developments resulted in controversy. The first of these, the 1991 rebuilding of the South Road bridge over the Sturt River, led to the formation of the Friends of Laffer's Triangle when a local resident noticed the damage that the construction had caused to the local environment. Environmental issues came to the fore during the planning of the Southern Expressway, along with concerns that the work would destroy a significant archaeological site at Warriparinga. A similar combination of concerns resulted in changes to the Ansett Australia Call Centre after it was proposed in 2000, as both environmental and cultural issues led to a number of protests against its construction, although, like the other two projects, the call centre was eventually completed on the site.