139 Piccadilly, a Grade II Listed mansion formerly home to Lord Byron and Baroness d’Erlanger, is on the market for £29.95 million through Wetherell, with the potential to reach £70 million post-renovation.

The mansion overlooking Green Park spans an impressive 14,624 square feet (1,358.6 square metres) and offers the potential as a restored single-family home, private member’s club, embassy, retail boutique, office, or medical facility. Its current valuation could skyrocket to £70 million post-refurbishment, making it a great investment for the discerning buyer.

Most recently used as an office building, the house provides accommodation over lower ground, ground and five upper floors, and has full planning permission to convert back into a single-family house.

As a restored mega-mansion the home would offer circa 15,339 sq ft of living space including a double basement for a leisure complex. If converted back into a single-family house, the palatial home could be worth up to £70 million upon completion.

The single-family house conversion option could provide an entrance hall, staircase hall, passenger lift, seven grand reception rooms, up to eight ensuite bedrooms, a new roof terrace garden and lower ground and a new basement floor providing a private cinema, games room, a family room, kitchen, staff quarters and health spa including a gymnasium, swimming pool, steam room, sauna, beauty/treatment rooms and changing/shower facilities.

The stunning visual of the library above is one in the marketing collection commissioned by Wetherell and created by multi-award-winning design house Casa E Progetti. Scroll down for more CGI images and the fine detail of the heritage features at the property.

Peter Wetherell, Founder & Chairman of Wetherell commented: “The provenance of this Piccadilly mansion building overlooking Green Park is outstanding. It was once the London home of poet Lord Byron and during the 1920s and 1930s was the Mayfair private palace of French heiress Baroness Catherine d’Erlanger, one of the richest women in Europe at the time. Now a buyer has the opportunity to close the circle and bring this landmark building back to life.” 

Robert Britten, Sales Director at Wetherell said: “This magnificent period building is one of the few surviving private palaces in Mayfair providing a discerning buyer with the opportunity to regenerate and transform it into a single palatial family home, an Embassy, private member’s club, new offices or a flagship retail boutique. Buildings of this scale and importance and in such an ultra-prime Green Park location rarely come up for sale in Mayfair, it is an outstanding opportunity for someone wanting a trophy property in one of London’s finest addresses.”  

The mansion-townhouse at 139 Piccadilly is for sale with a guide price of £29,950,000.

For more information please get in touch with selling agent Wetherell on Tel: +44 20 7529 5566 or visit www.wetherell.co.uk.