Located on the edge of Hyde Park, the 19th-century residence has been home to several illustrious owners..

A palatial London mansion listed for £42.5 million (about $52.3 million) is just one of two standalone mansions on London's famous Park Lane, one of the city's most famous streets. And, thanks to its notable past owners and intact period details, it's the most important property to be listed in the posh neighborhood of Mayfair for years. Built between 1857 and 1858 by Thomas Cundy II, the Italianate-style mansion was once home to the Marquess of Bristol and art dealer Henry Joseph Duveen, whose clients included William Randolph Hearst, J. P. Morgan, John D. Rockefeller, and Andrew Mellon.

The home overlooks the 350-acre Hyde Park and has been fully modernized while retaining many of its original French Empire interiors. Duveen, who routinely hosted some of the world's wealthiest individuals, tapped private palace architect William Henry Romaine-Walker to refurbish the property in 1906. Romaine-Walker transformed the property into a lavish mansion, with a French Empire-style marble staircase, ceiling cornicing, and decorative wall moldings in the entrance hall, grand second-floor landing, and the reception rooms; and he installed many marble fireplaces and grand Corinthian columns.

Though the home has gone through many iterations over the years, including being used as private office space in the mid-20th century, the home still retains its incredible original features—the cornicing is considered some of the most detailed in all of Mayfair—plus modern amenities and state-of-the-art technology in every room.

The 11,000-square-foot home has six bedrooms, including a full-floor primary bedroom overlooking Hyde Park. The primary suite offers exceptional privacy and has an Arabescato Corchia marble fireplace, a formal living area, dual walk-in closets, and a bathroom swathed in Rosso Lavante marble. There are built-in wall mirrors and wall lights, a hydrotherapy bath with chromotherapy lights, and a steam shower.

The remaining rooms have balconies and marble en suite bathrooms, while the penthouse-style bedroom suite on the top floor features a vaulted ceiling with skylight windows.

There's a grand entrance hall; four grand reception rooms, one of which features a bespoke cocktail bar with Baccarat crystal chandeliers and wall lights; a wood-paneled study/library; a formal dining room with French doors that open to the garden terrace; a wood-paneled study/library; temperature-controlled red and white wine cellars; an elevator; and a movie theater. The reception rooms can host up to 150 people at one time. There is also a garden terrace and approved plans for a rooftop garden.

However, it's the lower-level amenities that transform this mansion from special to spectacular. The lower floor features a double-height gym, sauna with mood lights, steam room with a rainforest shower, massage room, and juice bar. There's also a 50-foot indoor swimming pool—one of the largest in Mayfair—and a mosaic-lined hot tub. Connecting the pool level to the floor above is a beautiful glass staircase etched with illustrations of Hyde Park, Marble Arch, and Hyde Park Corner. 

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