The most expensive property to ever go on the market in is fit for a king - but could set you back £20m. Jesmond Towers is in an area popular with footballers and students. The former private school, which has 12 bedrooms, eight bathrooms and nine separate living spaces, is regarded as one of the finest that the city has to offer, set within six acres of grounds and gardens.

It is now owned by Jeff Winn, the founder of accident insurance specialist Winn Group. He is said to have spent around £14m upgrading the property since buying it from former Newcastle United owner Freddy Shepherd for £3.6m in 2013.

It is likely to attract interest from Newcastle United footballers as well as business moguls, and is being marketed around the to potential buyers. Neighbours include current Toon stars Sandro Tonali and Sven Botman.

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The new owner will enjoy a cinema room, entertainment suite, a 'wellness suite' and a fully-equipped dog grooming room. Its sale details state: "The refurbishment of this building has been extensive, from the complete replacement of the main roof to new windows, completely new services throughout supporting a luxury mansion.

"State-of-the-art kitchens, bathrooms and lighting features are common throughout this truly splendid home."

Duncan Young, founder of estate agent Sanderson Young described Jesmond Towers as the 'most magnificent' listing to have been made inside the suburbs of Newcastle city.

He added: "The owners have invested over £14m to create a simply stunning mansion house within its own private six-acre park. The house has more than 25,500 sq ft of accommodation plus two detached lodges and a former gymnasium.

"It shows great potential for redevelopment to the rear of the site. A truly exceptional property."

Winn Group, which was launched in Byker 23 years ago, has seen huge growth over the past 12 years, fuelled by a partnership formed with international investment companies JZ International (JZI) and Souter Investment Group.

Mr Winn stepped down as CEO three years ago and moved into an executive chairman role, and around the same time he became engaged to fiancée Allana Luke, with whom he has now been with for five years.

Since then, Mr Winn has become a father to Aria – and her arrival has clearly made him assess his future. He said: “I’ve recently stepped down from the business and I’ve got a villa in Marbella which I’ve had for about 10 years. I’ve been spending a lot more time at the villa, especially in winter, so I came to the conclusion that if I’m going to spend more time there, is it worth keeping the house on?

“It’s a bit of a combination of things - retirement, a change of location and also the tax situation and there’s uncertainty in general with other things going on. I was locked in to the firm for 10 years when we took on investment, but now I’m free of that."