Investa Commercial Property Fund (ICPF) has confirmed it is selling 50% of its management platform to Macquarie Capital Real Estate Investments (MREI), casting doubt over a separate bid by Blackstone to take over Investa Office Fund (IOF).

As reported last week, Macquarie has been in negotiations to acquire a stake in Investa Office Management Holdings, opening up the possibility of a return to real estate fund management in Australia.

The platform manages AU11bn worth of Australian office towers, including assets owned by ICPF and Investa Office Fund (IOF).

Blackstone鈥檚 AUD3.1 billion (鈧2bn) bid for IOF could be disrupted by the change in ownership.

ICPF, which is IOF鈥檚 single largest shareholder (it owns 19.99%), has written to the entity responsible for IOF, Investa Listed Funds Management, to confirm that, following the transaction, it could vote on Blackstone鈥檚 takeover offer.

IOF unitholders are due to vote on the Blackstone offer on 21 August.

ICPF鈥檚 ability to vote would mean it has a material influence on whether the Blackstone takeover gets across the line, a source told 91传媒在线.

A leading stock analyst, Michael Vincent of CLSA, agreed. In a client note he said that, in the event ICPF that can vote, 鈥渢he scheme at the current AUD5.15 bid price will be blocked鈥.

Blackstone will require approval from 75% of those who vote at next week鈥檚 meeting.

The source told 91传媒在线 that at least two of three proxy firms involved have indicated they will vote against the deal, which has been described as 鈥渦nfair but reasonable鈥 by an appointed independent expert.

He added that some fund managers, including APN Asset Management, have been vocal in their opposition to the deal, which they claim undervalues IOF.

Proxy advisory company ISS is supportive, but CGI Glass Lewis and Ownership Matters are opposed to acceptance of the bid.

ICPF have not yet decided whether to vote for or against, said the source.

Opinion is, however, divided on whether ICPF will actually be allowed to vote on the bid under existing corporation regulations.

CLSA鈥檚 Vincent said: 鈥淏ased on our understanding of the law, we would be surprised if ICPF became eligible to vote given it continues to have an economic interest in the management platform.鈥

Analysts believe Blackstone will have to improve its offer to win over more shareholders, including ICPF.

The price of Macquarie鈥檚 investment in the Investa platform was not disclosed. Last December, the platform was valued at AUD90m.

In a statement to the Australian stock exchange today, Investa CEO Jonathan Callaghan said the investment by MREI made excellent strategic sense.

鈥淢REI brings a proven track record of growing long-term value of management platform investments and has complementary skill sets we can leverage,鈥 Callaghan said.

鈥淔urther, MREI鈥檚 strong capital raising and investment capability is expected to create future partnership opportunities.鈥

It is believed Macquarie looks to the investment as an opportunity to invest in the best-in-class specialist manager and to leverage off its expertise and management platform.

Macquarie鈥檚 negotiations with ICPF began nine months ago, predating the Blackstone offer.

ICPF has a strong investor base of Australian superannuation funds, and it is thought that Macquarie will bring in its global capital market skills to further broaden ICPF鈥檚 capital sources.