This exceptional duplex penthouse apartment in Mayfair's elegant Georgian architecture offers a rare combination of exclusivity, charm, and potential for further development. With a spacious reception room featuring four south-facing sash windows and panoramic views, a separate family-sized kitchen and dining space, and a prominent staircase connecting the upper storey, this property is perfect for those seeking a luxurious and private residence. The apartment boasts four bedrooms, including a grand master suite with en-suite and guest bathrooms, as well as a naturally lit loft space with potential for further development. With a previously extended lease of 109 years and the option to buy a share of the freehold, this property presents a unique opportunity for the discerning buyer to put their own stamp on this heritage-rich property while still enjoying the prestige and exclusivity of Mayfair's finest residential district.