The company said it intended to seek judicial advice to adjourn the meeting set for Sept. 17, where it intended to solicit shareholders over a takeover offer from Blackstone. A new date for the meeting was yet to be determined.
Investa also said it would engage with Oxford Properties Group over a possible binding proposal after the Canadian landlord sweetened its bid for the company on Thursday.
Oxford had offered A$5.60 for each share in Investa, A$0.10 higher than Blackstone's offer and valuing Investa at A$3.35 billion.(1.84 billion pounds)
Blackstone had made a public A$3.08 billion play for Investa in May, and had increased its offer in August.
Then Oxford came in with a A$5.50 a share offer earlier this month. Trumping Oxford's first approach last week by 2 cents, Blackstone suggested its A$5.52 bid would be "best and final, in the absence of a superior proposal".
Under Australian takeover rules, bidders must wait four months to re-approach a target after declaring an offer unequivocally final.
A Blackstone spokeswoman in Sydney declined to comment.
(Reporting by Ambar Warrick in Bengaluru; Editing by Stephen Coates)