Mayfair Penthouse | Grosvenor Square W1K | Auction starting from £11.5m

Available by private auction. Opening bid starting from £11,500,000, subject to reserve. Bids invited by 18 June 2026.

An exceptional and rarely available trophy penthouse on Grosvenor Square, Mayfair's most prestigious address. For full details on the auction process, please contact us to register your interest.

Flat 6, 18 Grosvenor Square is a five-bedroom duplex penthouse of approximately 4,351 sq ft, spanning the sixth and seventh floors of this well-managed period building, with direct lift access and a south-facing roof terrace of approximately 722 sq ft overlooking the gardens. The property requires ful...

Features & Amenities

24 Hour porter

Built in Kitchen Appliances

Terrace

Penthouse

Residents' Permit Parking

Access to Communal Gardens

Disclaimer: Please note that all sizes listed are approximate and based on documentation provided at the time of listing the property. Exact unit/plot sizes may vary from what is presented above.

Location

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Let's get in touch

Roly Ingleby-MacKenzie

Senior Director - Sales (Consultant)

Listed Office

Mayfair United Kingdom Sotheby's International Realty

48 Conduit Street, London, W1S 2YR