[3] In 1758 the estate passed to James Murray of Broughton, who sold it in 1764 to the merchant and slave-trader Richard Oswald,[5] who built the present Auchincruive House.

[3] Oswald Hall continued in use, but the temple deteriorated, and in 2003 it was included on the Buildings at Risk Register for Scotland, its condition assessed as "very poor".

Plans to redevelop the core of the Auchincruive site as a research facility, while selling off the remaining part of the 246-hectare (610-acre) estate for housing and golf course development, were approved by South Ayrshire Council in January 2011.

The plans involve the restoration of listed buildings and historic landscape features, and construction of 400–500 houses and a business research campus.

[12] However, in December 2012 Oswald Hall was sold for $1.5m (£1.0m) to biotech company Neogen Europe to be used as its corporate offices, with its Managing Director, Dr Stephen Holmes, being a former scientist at the college.