18, 18 Grosvenor Square, London, W1K 6LE

Description Occupying the sixth and seventh floors of an imposing red-brick building on Grosvenor Square, this five-bedroom penthouse presents a rare opportunity to acquire and reimagine one of Mayfair’s most remarkable lateral residences.

Extending to approximately 4,351 sq ft, with a south-facing roof terrace of around 722 sq ft overlooking the square’s gardens, the apartment is offered for sale by private auction and requires comprehensive renovation throughout.

Direct lift access opens into a private entrance lobby on the sixth floor, where a sequence of expansive reception and entertaining spaces are arranged beneath high ceilings and period detailing.

Two generous reception rooms sit at the heart of the plan, alongside a separate kitchen and dining room.

The principal bedroom suite occupies a substantial footprint and includes an ensuite bathroom and dressing space, while three further bedrooms are also arranged across this level, alongside a utility room and extensive ancillary storage.

A sweeping internal staircase rises to the seventh floor, where an additional reception room opens directly onto the terrace.

Framed by uninterrupted rooftop views across Mayfair and the gardens below, the terrace offers an unusually large outdoor footprint for central London.

A fifth bedroom suite, study and powder room complete the upper floor, while a commercial dumbwaiter connects directly to the kitchen below.

The apartment forms part of a well-managed building with 24-hour porterage, additional service lift access and a separate storage room on the lower ground floor.

Situated within the Mayfair Conservation Area but not listed, the property offers considerable flexibility for refurbishment and reconfiguration, subject to the necessary consents.

Grosvenor Square remains one of London’s most distinguished addresses and has undergone a significant transformation in recent years.

The former us Embassy has been restored by Sir David Chipperfield as The Chancery Rosewood, while neighbouring developments, including Twenty Grosvenor Square and One Grosvenor Square, have further cemented the square’s position at the centre of Mayfair’s evolving super-prime landscape.

Hyde Park is approximately 0.3 miles away, while Bond Street Underground station is approximately 0.2 miles away, providing access to the Central, Jubilee and Elizabeth lines.