Wynyard Place

CBD, Sydney

Wynyard Place development includes Shell House, 285 George Street and Wynyard Tower projects.

Located in the heart of the Sydney CBD, Brookfield Properties’ Wynyard Place development consists of three projects: The Tower, a full demolition and rebuild of a new 27-storey tower and the restoration of two adjacent heritage-listed buildings, Shell House and Beneficial House. Engineered by TTW, the project is designed by London-based Make Architects and Australian Studio, Architectus and is being constructed by Multiplex.

Designed by Spain & Cosh and constructed by Howie Moffat and Co in the 1930’s, Shell House was the fifth building erected by Shell Oil Co in an Australian capital city. It was considered to be one of the finest of the series. Shell House is a distinguished example of a “pre-skyscraper era” Interwar Commercial Palazzo building and is dominated by the Gillett & Johnston clock tower, which became a Sydney landmark. Shell House is also the only surviving Sydney building in the Commercial Palazzo style clad in glazed terracotta tiles.

At 65.5m total height above ground level, Shell House is one of the tallest retained heritage façades in the world and certainly one of the most complex projects of its kind.

The major restoration and re-invention of this renowned Sydney landmark would not have been possible without the pioneering concept and subsequent construction of the Shell House Temporary Retention Works. The project’s challenges encompassed design, construction and heritage concerns within an area of constant activity. Creative engineering, in conjunction with advanced analysis techniques, were employed to retain this complex heritage structure, which showcases the ingenuity of the team involved in its delivery. The heritage fabric of the façade and 400t clock tower in the heart of the CBD has been retained and restored for future generations allowing the preservation of the heritage structures and adaptive reuse to create.

The engineering design was a result of the collaboration between TTW and Multiplex, working in close consultation with Brookfield Properties, Make Architects and Architectus to deliver optimal outcomes for this extremely complex project.

CBD Commercial Development.

  • Heritage façade retention (Shell House and 285 George Street).
  • Heritage clock tower retention (Shell House).
  • Staged load transfers (Existing-Temporary; Temporary-Permanent (Shell House).
  • Complex sequencing and close coordination with the contractor’s team at Multiplex.

Temporary Works key features:

  • Transfer of 400t Heritage Clock tower from existing columns to the temporary support system and demolition of the existing support structure.
  • Suspended 400t Heritage Clock tower, eccentrically supported over live demolition/construction site.
  • External Façade retention trusses integrated with scaffolding and hoarding design.
  • Central Stability core with integrated suspended crane base.
  • Stability Core concrete encased steel plunge piles, de-cased and braced as excavation progresses for 12.5m below existing basement level.
  • Stability core stabilised utilising the mass of the offset clock tower through 2 levels of outrigger beams.
  • Additional stability provided by thrust braces into the excavated sandstone face and integrated into permanent shoring walls and façade support columns.

Permanent Works key features:

  • Offset new concrete stability core.
  • Permanent geotechnical loads resisted through basement diaphragm slabs.
  • Engagement/Disengagement sequencing from the temporary stability system.
  • New basement levels including substation and car parking.

Integration with adjacent Wynyard Place Tower development car parking.

  • Crane to be relocated on top of new permanent core walls.
  • Composite steel new permanent slabs.

Client: Brookfield

Architect: Make Architects and Architectus

Builder: Multiplex

Value: $1B

Completion: 2020

Sector: Commercial/Industrial, Retail

Services: Heritage, Construction Engineering, Structural

Shell House Awards:

  • Australian Construction Award – Regeneration Project of the Year
  • Australian Construction Award – Australian Build Excellence Award

Images © Architectus and Skyview.