The historic Old War Office where Sir Winston Churchill once plotted Second World War manoeuvres could soon be turned into smart flats, after it was sold for an undisclosed sum.
The Ministry of Defence (MoD) has confirmed the landmark 580,000 sq ft property at 57 Whitehall had been sold on a long-lease arrangement to the Hinduja Group, in partnership with Spanish group Obrascon Huarte Lain Desarrollos.
The Government said it understood the building would be redeveloped as a hotel and residential apartments.
Defence staff located in the Old War Office building were expected to move out in around a year, with most operations to transfer to MoD's main building.
Defence Secretary Michael Fallon said: " The building has played an important part in our country's history and now presents a unique redevelopment opportunity in the heart of Westminster. The purchaser will be granted a new 250-year lease to ensure that the heritage and security of the building is well managed."
The heritage-listed building includes around 1,100 rooms across seven floors, linked by more than two miles of corridors.
Completed in 1906, the Old War Office once housed secretaries of state including Lord Haldane, Lord Kitchener, David Lloyd-George and Churchill.
It was put up for sale after being declared surplus to MoD requirements in August 2013.
The sale, which forms part of the MoD's London Estate Rationalisation demonstrates MoD's commitment to reducing costs of the London estate. The MoD has worked closely with Westminster Council, English Heritage and other Government stakeholders throughout the process.