Mayfair Mega-mansion! London’s most expensive property goes on sale for £54.5 MILLION

One of Mayfair’s oldest mansions has gone on sale for a staggering £54.5million – making it the most expensive home to come on the market since the national lockdown. 

The stunning Grade II listed townhouse on Upper Grosvenor Street in central London was built in 1732 and extensively refurbished by Chelsea-born architect Ralph Knott – best known as the designer of County Hall, home of the former Greater London Council – in 1908.

Since then the property, which spans six storeys and occupies more than 14,500 sq ft, has been gloriously restored and modernised by its current owners, Jersey-registered company Boss Holdings Ltd – while still paying homage to its history. 

Its eye-watering price tag is 32 times higher than the £1.7 million it sold for in 2008, reports the Evening Standard

One of Mayfair’s oldest mansions, a Grade II listed townhouse on Upper Grosvenor Street, has gone on sale for a staggering £54.5million – making it the most expensive home to come on the market since the national lockdown

The property, which spans six storeys and occupies more than 14,500 sq ft, has been gloriously restored and modernised by its current owners, Jersey-registered company Boss Holdings Ltd - while still paying homage to its history. Pictured: one of the glamorous sitting rooms

The property, which spans six storeys and occupies more than 14,500 sq ft, has been gloriously restored and modernised by its current owners, Jersey-registered company Boss Holdings Ltd – while still paying homage to its history. Pictured: one of the glamorous sitting rooms

The palatial pad is ideally configured for both formal entertaining and comfortable family living. Pictured, the main sitting room occupies almost the entire floor

The palatial pad is ideally configured for both formal entertaining and comfortable family living. Pictured, the main sitting room occupies almost the entire floor

At the heart of the home is the newly kitted out family kitchen (pictured), positioned on the ground floor - and supported by a 'dirty kitchen' on the lower ground floor where actual cooking takes place - where families can get together

At the heart of the home is the newly kitted out family kitchen (pictured), positioned on the ground floor – and supported by a ‘dirty kitchen’ on the lower ground floor where actual cooking takes place – where families can get together

The 12-bedroom, nine bathroom pad, fronted in Portland Stone, is spread across the main mansion building and an additional mews house on Culross Street, which dates back to 1869 and is connected via a large basement and the ground floor. 

Its subterranean level, accessed via a lift, boasts a 73ft long swimming pool – one of the largest in a private home in Mayfair – as well as a wellness centre with a jacuzzi, fitness studio, sauna and a private screening room for post work-out relaxation. 

At the heart of the home is the newly kitted out stylish family kitchen, positioned on the ground floor – and supported by a ‘dirty kitchen’ on the lower ground floor where actual cooking takes place. 

The main house has five principle bedroom suites, including the master bedroom which occupies the entire second floor and has its own private and secluded roof terrace. 

Its subterranean level, accessed via a lift, boasts a 73ft long swimming pool (pictured) - one of the largest in a private home in Mayfair

Its subterranean level, accessed via a lift, boasts a 73ft long swimming pool (pictured) – one of the largest in a private home in Mayfair

Adjacent to the pool is a wellness centre with a jacuzzi (pictured), fitness studio, sauna and a private screening room for post work-out relaxation

Adjacent to the pool is a wellness centre with a jacuzzi (pictured), fitness studio, sauna and a private screening room for post work-out relaxation

There is an L-shaped drawing room on the first floor which leads out onto a large terrace, and a dining room on the ground floor which can comfortably seat 20 guests (pictured)

There is an L-shaped drawing room on the first floor which leads out onto a large terrace, and a dining room on the ground floor which can comfortably seat 20 guests (pictured)

The 12-bedroom, nine bathroom pad, fronted in Portland Stone, is spread across the main mansion building and an additional mews house on Culross Street. Pictured: one of the bedrooms in the main house

The 12-bedroom, nine bathroom pad, fronted in Portland Stone, is spread across the main mansion building and an additional mews house on Culross Street. Pictured: one of the bedrooms in the main house

The palatial pad is ideally configured for both formal entertaining and comfortable family living, with a staff suite, an L-shaped drawing room on the first floor which leads out onto a large terrace, and a dining room on the ground floor which can comfortably seat 20 guests.  

An additional five bedrooms are located in the mews house, which also boasts its own kitchen, family bathroom and drawing room as well as a gym and garage for two cars. 

Rob Windsor, director of agents Clifton Property Partners, along with Knight Frank, told ES Homes & Property that the property, which was previously rented out for £27,500 a week, had been in poor condition when the owners purchased it six years ago.

The eye-watering price tag of the mansion is 32 times higher than the £1.7 million it sold for in 2008. Pictured: an office and meeting room

The eye-watering price tag of the mansion is 32 times higher than the £1.7 million it sold for in 2008. Pictured: an office and meeting room

The home has been beautifully finished with modern accents to complement its historical features. Pictured: one of the elegant bathroom suites

The home has been beautifully finished with modern accents to complement its historical features. Pictured: one of the elegant bathroom suites

The master suite features an enormous walk-in wardrobe - a fashionista's dream - which has its own dressing area and additional storage space

The master suite features an enormous walk-in wardrobe – a fashionista’s dream – which has its own dressing area and additional storage space

An additional five bedrooms are located in the mews house, which also boasts its own kitchen, family bathroom and drawing room as well as a gym and garage parking for two cars

An additional five bedrooms are located in the mews house, which also boasts its own kitchen, family bathroom and drawing room as well as a gym and garage parking for two cars

‘You could stand on the ground floor and look all the way to the top through the rotten floorboards. Now it really is the whole package, large freehold house, mews and lots of outdor space,’ he said.

‘Mayfair houses offering impressive period grandeur, self-contained leisure facilities, extensive private gardens and interconnecting mews accommodation are exceptionally rare, so perhaps unsurprisingly, we’ve seen strong interest from both domestic and overseas buyers mindful of the quality and scarcity of houses such as Upper Grosvenor Street.

‘The immediate vicinity is presently undergoing an astonishing transformation with the Rosewood Hotel soon to open its doors on Grosvenor Square, and the Square itself also set to be radically improved and enhanced, surely positioning Upper Grosvenor Street as one of the most sought after addresses in London.’

This week it emerged the average asking price of a home has soared to a record £323,530 as sellers capitalise on unprecedented demand during the stamp duty holiday.

Prices rose by 1.1 per cent from September to October and are now £16,818 – or 5.5 per cent – higher than the same time last year. Experts said they expect growth to continue until the new year when it could peak at 7 per cent.

However, a survey by the Bank of England last week predicted borrowers would soon find it harder to get a mortgage as lenders prepare for a winter jobs crisis.