HONG Kong investors pushed the Hang Seng Index to a new record close yesterday of 8,192.18 - up 186.62 points. The strong local buying, after weeks of foreign domination, enabled the index to make its sixth historic high in seven days of trading. Buying was triggered by news of Henderson Land's launch of a US$400 million (HK$3.1 billion) convertible bond to overseas investors. The news sparked a new rally in other property counters, including the giant Sun Hung Kai Properties. The major developer also rose on the back of bumper results, announced after the market closed on Friday, with a net profit of $6.69 billion for the year to the end of June, up 43 per cent. Local brokers remain cautious and are looking for more details about the numbers behind the valuations used to price the Henderson bond issue.