Australia Square Tower

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Height: Occupied
153 m / 502 ft
Height: To Tip
170 m / 558 ft
Height: Architectural
170 m / 558 ft
Australia Square Tower Outline
Floors Above Ground
Floors Below Ground
# of Elevators
Tower GFA
53,000 m² / 570,487 ft²
# of Parking Spaces


Official Name Australia Square Tower
Structure Type Building
Status Completed
Country Australia
City Sydney
Street Address & Map 264 George Street
Postal Code 2000
Building Function office
Structural Material concrete
Energy Label 4.5-STAR NABERS
Construction Start 1965
Completion 1967
Rankings Click arrows to view the next taller/shorter buildings
Regional Ranking #68 Tallest in Oceania
National Ranking #68 Tallest in Australia
City Ranking #18 Tallest in Sydney

Companies Involved

Owner Dexus Property Group; General Property Trust
Design Harry Seidler and Associates
Structural Engineer
Design Pier Luigi Nervi
Main Contractor Civil and Civic
Material Supplier
• Elevator KONE

About Australia Square Tower

Australia’s tallest building upon completion, Australia Square Tower was an innovative structure for its time and was among the tallest all concrete buildings in the world. The building was conceived as a two-building complex occupying an entire city block which required the demolition of nearly 30 previous structures. The taller circular building is positioned at the western end of the block, while a publicly accessible plaza and the companion Plaza Building are positioned to the east. Both structures celebrate concrete as a sculptural material with structural expressionism, the Plaza Building’s floorplates are elevated above the ground level, set upon clusters of angled pilotis exhibiting structural load transfers between the building’s rectilinear frame and the ground, meanwhile the circular, taller tower has a perimeter of exterior concrete columns, tapering as they rise with curved concrete spandrels between them and a coffered ceiling in the lobby created from a radial ribbed floor system within the concrete floor slab.

During construction, quartz concrete was pre-cast into units of standardized sizes and used not only as a finish of the exterior façade, but also as formwork for the pouring of the reinforced concrete structure, assisting in shorting the construction schedule as the building rose at an average rate of one floor every five days. The circular form of the taller tower with the externalized skeletal structure provided for a highly efficient design achieving a total floor area of 12 times the entire site area, despite a small building footprint occupying only 25 percent of the block, while also providing for a robust resistance to windloads and a high degree of solar shading. Australia Square Tower is one of Sydney’s most famous buildings and is integral part of the city’s rich architectural heritage.

CTBUH Initiatives

Warm Weather Spaces Walking Tours 2015
17 Sep 2015 – Tour Report

Research Papers

The Role of Design Competitions In Shaping Sydney’s Public Realm
30 Oct 2017 – CTBUH Journal, 2017 Issue IV

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