Transforming the office experience and Sydney’s skyline, the 55-storey tall Salesforce Tower is officially the tallest office building in Australia.

Salesforce Tower is the centrepiece of the new Sydney Place, that includes a retail laneway network, a revitalised bar and dining establishment Jacksons on George, and a Plaza Building with artwork canopy over a plaza and public cycle facility.

The unique half-hexagonal geometrical design connects the office to the harbour providing views of Sydney Harbour from Watsons Bay to Paramatta and will accommodate up to 5,500 people.

Working closely with Lendlease and our collaborators, our team led the structural engineering for the project from planning and design to construction.

The precinct’s new plaza will be Circular Quay’s first in 50 years and open to the public 24/7. Once complete, the precinct will connect George Street to Circular Quay with laneways integrating with new and existing precincts extending the laneway retail experience throughout the broader city blocks.

The redeveloped precinct will transform a pocket of Circular Quay – one of Australia’s most significant historical and cultural precincts – into a community and innovation precinct, helping accelerate the Circular Quay Precinct Renewal Program.

Structural engineering for Australia’s tallest office tower

Creating unobstructed panoramic views for Australia’s tallest office tower and working with a unique geometry required complex problem solving and creative structural engineering solutions. 

The tower’s expression by Foster + Partners responds directly to the structural stability system of direct and effective load paths and material efficiency. While a centre core is the spine of most buildings of this height, Salesforce Tower has a rear core to maximise views to the harbour.

To reduce the eccentric vertical load on the core from the long span floors and maximise floorplate efficiency by minimising wall thickness, the tower’s columns and floors are constructed from lightweight composite steel and concrete construction.

We designed a unique and highly effective stability system with an organic belt-bracing system expressed on the north facade. The bracing combines with outriggers located at the tower’s mid-level plantroom to directly activate the full width of the building, connecting the core south wall directly to the twin columns at the tower’s most northern tip. The bracing’s east and west edge aligns with the outriggers at each end of the core providing the shortest and stiffest connection across the width of the building to resist the dominant wind loading direction. In addition, the belt bracing assists in reducing the towers twist from the offset core.

Located on reclaimed land and in Circular Quay’s tidal zone, the tower’s basement is below harbour level with the heritage-listed Tank Stream, Sydney’s 19th century former fresh watercourse, under the eastern side of the building. Working with archaeological teams and the First Nations community, we designed a retention system to manage tidal groundwater.