FTSE 250-listed property group Shaftesbury is expected to become the target of a bid takeover from a Hong Kong billionaire.Samuel Tak Lee's business, Prudential Enterprise, has grown its stake in the company above 5% in the past month, leading to rumours of a potential bid, the Sunday Times reported.The 75-year-old, who according to Forbes has amassed a fortune of £1.9bn, is reported to have increased his investment on the advice of Ahsan Ellahi, the chief executive of the Langham Estate.The estate owns a number of properties in central London neighbourhood Fitrovia.