Six bidders, including Charter Hall Group and GPT Group, have been shortlisted for Blackstone Group LP's more than A$800 million half-stake in Westpac Banking Corp.'s headquarters in Sydney, The Australian Financial Review reported.

The other four parties still in contention for the interest in the 77,000-square-meter building at 275 Kent St. are investment manager AMP Capital, superannuation fund ISPT, financial services firm JPMorgan and global funds giant Morgan Stanley, the publication noted March 28.

Blackstone tapped JLL to help with the ongoing divestment of its Westpac Place stake, which it acquired in 2014 from listed diversified developer Mirvac Group for A$435 million, according to the paper.