In a move that could net the Canadian government more than 250 million pounds, estate agents Savills UK was instructed to sell the building at 1 Grosvenor Square back in September.
However, Savills and the Canadian High Commission are yet to officially confirm the Indian buyers of the property.
"The process of selling Macdonald House is ongoing," a Canadian High Commission spokesperson told PTI.
The sale of Macdonald House is aimed at helping to fund the transfer and re-development costs at Canada House on Trafalgar Square in London.
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London has been witnessing a massive property boom this year, largely triggered by cash-rich overseas investors keen on investing in the British capital.
Estate agent Wetherell recently claimed at least 20 of the 165 diplomatic missions in London have been sold or have explored a sale in the past six months after prices in up-market embassy areas rose by up to 60 per cent since 2007.