Seckford Hall hotel in Woodbridge, Suffolk, has been brought to market for £4.1m for the freehold of the property.
The property is being sold by Stephen and Julie Pankhurst, the founders of early social networking site Friends Reunited. The couple acquired the four-AA-star, 15th century property in 2012 from Christine and Michael Bunn, whose family had run the business since 1951.
The Pankhursts embarked on a multi-million pound refurbishment of the 32-bedroom hotel in 2013 and are now said to be selling the hotel "to focus on other business sectors". They personally made around £30m from the £175m sale of Friends Reunited to ITV in 2005.
Colliers International is handling the marketing of Seckford Hall and has set a bid deadline of 27 April 2017.
The Grade II-listed country house hotel, which is set within around 10 acres of land, has a two-AA-rosette, 80-cover restaurant; an array of multi-functional events rooms; and a spa with heated pool. A detached former hunting lodge and multiple other outbuildings also form part of the sale.
The Hall is said to have been the dynastical home of the Seckford family, Thomas Seckford having being an official of Queen Elizabeth I, and some of the furniture in the building can be traced back to Buckingham Palace and Windsor Castle.
Paul Barrasford, director of hotels agency, Colliers International said: "Seckford Hall is a magnificent Tudor building with a rich and illustrious history. Under the tenure of the current owner, the property has benefited from an extensive investment programme across multiple areas of the building, helping to make it the successful business it is today yet still with huge growth potential."
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