It's the sort of price tag to make even billionaire's eyes water so let's hope that the owners of London's 94 Piccadilly will throw in a few extras when it comes to selling their latest investment.
Property tycoons, David and Simon Reuben have submitted plans to Westminster City Council to transform the crumbling London landmark into a sumptuous £200million 48-bedroom mega-mansion, complete with an underground swimming pool, spacious gym, oh, and a 35,000-bottle wine cellar, naturally.
Overlooking St James's Park and Buckingham Palace, the grand grade I-listed building was originally built for Charles Wyndham, 2nd Earl of Egremont in the 1750s.
Other previous owners include Prince Adolphus, who named the mansion Cambridge House, and former prime minister, Lord Palmerston.
But the Palladian-style property has fallen into disrepair since its last tenants, the In and Out club moved out in 1999.
If the estimated £200million price tag is met, the property will become Britain's most expensive home - dwarfing the £140million paid by Russian billionaire Andrey Borodin for Park Place in Berkshire.
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