Sydney Masonic Centre was built in 1974 and the tower in 2004.
Construction is of form concrete facade. The Civic Tower is Australia's
first building to be fully supported on a central lift core without the use of continuous perimeter columns extending down to footing levels.
Constructed above Sydney's Masonic Centre, the innovative structural design features a space frame using post tensioned tie elements and high
strength concrete filled tubular steel struts to transfer the 25 story office building perimeter back onto its core.