Canadian-based Oxford Properties has come back fighting with a higher offer of $5.60 for the listed Investa Office Fund. : Canadian-based Oxford Properties has come back fighting with a higher offer of $5.60 for the listed Investa Office Fund and revealed it has bought out manager Investa Commercial Property Fund's crucial 19.9 per cent stake. This is 8¢ higher than the offer from the US private equity giant Blackstone and comes only two days before IOF unitholders are scheduled to vote on the Blackstone proposal. Oxford has requested the meeting be adjourned.