The rumoured sale of The Center, the city's fifth-tallest building, was first reported last month.
Li's CK Asset Holdings confirmed in a statement to the Hong Kong exchange that the sale of its stake in the building had gone through for HK$40.2 billion ($5.15 billion) -- a record for a Hong Kong office tower according to Bloomberg.
The statement named the buyer as C.H.M.T. Peaceful Development Asia Property Limited, incorporated under the British Virgin Islands.
The consortium's largest shareholder is Beijing-based China Energy Reserve and Chemicals Group, the South China Morning Post reported, citing sources familiar with the transaction.
Commercial and residential property prices in Hong Kong have been fuelled by an influx of money from wealthy mainland Chinese investors and developers.
The surging property market has become a political issue as costs in one of the world's most expensive cities continue to soar, forcing some small businesses to close due to sky- high rents while many residents cannot afford to buy or rent decent homes.
Nicknamed "Superman" for his business acumen, Li Ka- shing's companies are part of the fabric of Hong Kong life, ranging from internet services to supermarket chains.
The billionaire, who turns 90 next year, announced a sweeping reorganisation of his businesses in early 2015, saying he wanted to secure stability for the future.
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