The tower, at 85 Castlereagh Street, completes the $3.2 billion retail, lifestyle, tourism and commercial centre developed by the Westfield Group.

Allen & Overy’s Australia managing partner, Grant Fuzi, said the firm has leased the space for 15 years.

“Our new world class office space in the heart of the CBD … not only confirms our commitment to Australia and supports our on-going growth, it will also offer our clients and staff a leading environment in which to work and interact,” said Fuzi.

The newly constructed tower is targeting a 6-star Green Star Office Design Rating from the Green Building Council of Australia (GBCA), because it has been designed to a “premium sustainability classification”.