What features made the £140 million London penthouse so expensive? In 2020, a reported £140 million sale at No. 1 Grosvenor Square in Mayfair involved a penthouse assembled from three apartments, with a reported plan to create a 15,600-square-foot home. Its appeal combined historic restoration, exceptional scale and hotel-style amenities. The “second-priciest” label referred to the UK property market in 2020—not a current London ranking.
Why was No. 1 Grosvenor Square the second-priciest property sale in 2020?
Tatler reported the £140 million sale in November 2020. Mansion Global described it as the UK’s second-priciest property deal of that year, behind a reported Knightsbridge mansion purchase above £200 million. The original title’s dollar figure is not supported by those reports, and the ranking was UK-wide rather than London-only. (Tatler; Mansion Global)
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That status is historical, not a current ranking. A 2026 guide from United Kingdom Sotheby’s International Realty reports that 2–8a Rutland Gate sold for more than £300 million in 2023. The guide does not establish a comprehensive audited ranking of London property sales. (United Kingdom Sotheby’s International Realty)
What features made the penthouse stand out?
1. A historic façade rebuilt for contemporary living
Lodha and Eric Parry Architects undertook a three-year redevelopment that included reconstructing the building’s brick façade brick by brick. House & Garden reported that the work allowed for ceilings 4.2 metres high, pairing a historic exterior with contemporary residential space. (House & Garden)
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2. A restored Oval Room with a Kennedy-era connection
The entrance features a reconstructed Oval Room associated with Joseph Kennedy, who served as the US ambassador in London. House & Garden reported its restoration as part of the redevelopment. The room gives the building a specific historical link; it is not evidence that the penthouse itself was an ambassadorial residence. (House & Garden; Mansion Global)
3. A planned 15,600-square-foot combined home
The reported buyer acquired the top-floor apartment and two lower apartments, with a plan to combine all three into a 15,600-square-foot residence. Tatler and House & Garden reported the proposed configuration; the available reporting does not verify that the combination was completed. (Tatler; House & Garden)
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4. Shared, hotel-style amenities
Reports describe a 25-metre swimming pool, gym, spa and treatment rooms, library, private cinema, performance venue and 24-hour concierge among the development’s amenities. These are building facilities; the reports do not establish that they were all private to the penthouse. (House & Garden; Mansion Global)
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Do these features explain the £140 million price?
They help describe what made the property distinctive: restored architectural details, a large proposed private residence and extensive shared services in Mayfair. But the reports do not quantify how much any one feature contributed to the sale price. The £140 million figure is a reported transaction price, not a measured valuation of the façade, historic room or amenities individually.
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