Knoll House hotel in Studland Bay, Dorset has been sold by the Ferguson family, which has owned and run the hotel for nearly 60 years.
Savills sold the 84-bedroom property to "a high net worth individual" for an undisclosed price; the guide price was reported to be £15m.
Knoll House was built in the early 1900s and sold to the Ferguson family in 1959. Current owners Sarah, Michael and Christopher Ferguson have decided to sell the property and retire.
The hotel is said to have been frequented by children's author Enid Blyton, and the area to have inspired her Famous Five book series.
Martin Rogers, head of UK hotel transactions at Savills, said: "We are delighted to have secured new owners for Knoll House as the owners head into retirement following nearly 60 years of business. The UK regional hotel market continues to attract investors' attention as they look for long term income security and well known local assets."
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