Historic Bretton Hall will be turned into a 120-bed luxury hotel after planning permission was granted.
The Grade II-listed building, in the grounds of the Yorkshrie Sculpture Park, which dates from the 1700s, will be converted into a hotel and spa with restaurants, conference room and wedding facilities.
Wakefield Council planners granted permission for the project, which will include three-storey extensions to the north and east wings.
Council bosses said the redevelopment of the building would boost the numbers of people visiting the district to see attractions including the Hepworth gallery and Yorkshire Sculpture Park.
Denise Jeffery, the council’s cabinet member for economic growth, said: “Bretton Hotel and Spa will be a huge asset to the area, offering quality accommodation and leisure facilities to visitors in the heart of the Yorkshire Sculpture Triangle.
“The development will enhance our existing four-star hotel offer, which includes Wentbridge House Hotel, recently awarded Yorkshire’s Large Hotel of the Year, the Cedar Court, which has just completed a £500,000 refurbishment, and the historic Waterton Park Hotel, one of Yorkshire’s top wedding venues.
“As overnight visitors spend an average of £53.30 each per night when they come to our area, this development will boost the local economy and support jobs in the long-term.”
Wakefield Council bought Bretton Hall from the University of Leeds after it was closed as a campus in 2007.
Planning permission was already granted to convert parts of the building, which was designed and built around 1720 by Sir William Wentworth.
The latest permission includes partial demolition of extensions to the manor house, and full demolition of its refectory, student services bungalow and hostel buildings.
The stables, coach house, theatre, and library will be converted into offices and new roads and car parking will be added to the site.