Westfield announced the Westfield Group merger in May 2004. Westfield America Trust unit holders could either:
- elect to participate in a sale facility, under which they exchanged their units for either:
- cash, or
- Westfield Group stapled securities
- participate in the stapling distributions and have their units stapled to Westfield Holdings shares and Westfield Trust units.
The Westfield Group merger was completed on 16 July 2004.