MIRVAC GROUP — Delisting Announcement 2010

Aug 3, 2010

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4 August 2010

IMPLEMENTATION OF WESTPAC OFFICE TRUST ACQUISITION

Mirvac Group ("Mirvac”) [ASX: MGR] confirms that the implementation of the arrangement where Mirvac acquires all of the units in Westpac Office Trust (“WOT”) [ASX: WOT] (“Scheme”) has occurred today.

As a result, Mirvac has arranged the payment of $200 million cash in aggregate to WOT unitholders as consideration for their WOT units and allotted 149,010,494 Mirvac securities. Post implementation of the Scheme, there will be 130,692,420 unquoted instalment receipts issued by Westpac Custodian Nominees Limited, where the beneficial interest in each instalment receipt is over a Mirvac security.

The despatch of holding statements for Mirvac securities and payments under the cash option is anticipated to be completed on Monday, 9 August 2010. The final date for payments under the sale facility is Wednesday, 18 August 2010.

WOT CMBS facilities

As part of the Scheme’s implementation, Mirvac has capitalised WOT, and WOT has repaid all outstanding facilities secured over assets of WOT, and has cash collateralised its subsidiary WOT CMBS Pty Limited for its rated Series 1 CMBS notes which are due to mature on 16 November 2011. As a result of these payments having been made, all existing security provided by WOT over its assets has been released.

Further changes as a result of the Scheme’s implementation

Further changes that will occur as a result of the Scheme being implemented are as follows:

• 1

• WOT will change its name to the Mirvac Office Trust ;

• Westpac Funds Management Limited will retire as responsible entity of WOT and Mirvac REIT Management Limited will be appointed as responsible entity of WOT1;and

• ASX will be requested to remove WOT from the official list of the ASX and terminate the official quotation of WOT on Thursday, 5 August 2010.

For more information, please contact:

Adam Crowe General Manager, External Affairs +61 2 9080 8652

Investor Enquiries: Media Enquiries: Jessica O’Brien Kate Lander Group Investor Relations Manager Group Communications Manager +61 2 9080 8458 +61 2 9080 8397

1 ASIC forms to change the responsible entity of WOT and amend the name of WOT to the Mirvac Office Trust have been or are expected to be lodged with ASIC today.

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