The site, comprising a 3.6 acre patch which comes with an outbuilding, Grade II listed cottage, mobile classroom and the Grade II-listed mansion, had a guide price of just £400,000 at auction.
But earlier this month the site fetched £890,000.
School children from across Warwickshire had been travelling to the site for outdoor activities and learning since 1971 - an experience one teacher described as 'life-changing for pupils'.
But in 2020 Warwickshire County Council shut the site - at the time stating the closure was temporary and required because of the pandemic.
In subsequent meetings, the council decided the ongoing costs of the site - and the requirement for maintenance - was too much, and a decision was made to sell it.
Campaign group 'Save Male Hall' was formed, and they put together a 7,000-signature petition.
Warwickshire County Council said they considered this opposition carefully.