Sydney, NSW, Australia
Located in the heart of Sydney’s CBD, Australia Square Plaza (ASQ) is one of Australia’s most recognised commercial office buildings, comprising approximately 43,000m² across 40 tower floors and 13 plaza levels.
Working in partnership with Grosvenor Engineering Group, Dewick & Associates provided the Mechanical Operation & Maintenance (O&M) Manuals to support the subdivision of Levels 6 and 7 into speculative tenancy suites.
The project involved reviewing and re-configuring the existing base-building mechanical services while designing supplementary air conditioning and ventilation to suit the new tenancy layouts.
By Lauren Sahin
Credit: Image generated by Gemini AI, 2026. Royalty free. Conceptual image based on the project location.
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Grosvenor Engineering Group was responsible for delivering the mechanical services associated with the speculative tenancy fitout on Levels 6 and 7 of Australia Square Plaza.
The project required modifications to the existing base-building mechanical systems to accommodate a flexible tenancy layout, including supplementary air conditioning and ventilation for enclosed offices and meeting rooms. Dewick & Associates was engaged to provide the mechanical engineering documentation required to support design coordination, construction and the final handover of the completed works.
Commercial fitouts within existing high-rise office buildings present unique engineering and documentation challenges. Rather than designing mechanical services for a new building, the project required existing systems to be carefully assessed and adapted while maintaining compatibility with the tower’s base-building infrastructure.
The documentation needed to clearly distinguish between existing services and newly installed or modified systems, providing building operators and future tenants with an accurate record of the final installation. It also needed to support compliance with the National Construction Code (NCC), relevant Australian Standards governing mechanical ventilation and air-conditioning systems, and manufacturers’ operating and maintenance requirements.
Dewick & Associates worked alongside Grosvenor Engineering Group to develop the mechanical engineering documentation package for the fitout.
Using the project design information and installed system documentation, our team produced:
The documentation was structured to provide a clear record of how the supplementary systems integrated with the existing base-building mechanical infrastructure, enabling facilities managers and future tenants to confidently operate and maintain the completed installation.
Dewick & Associates delivered a coordinated documentation package that supported the successful handover of the Levels 6 and 7 speculative tenancy fitout within Australia Square Plaza.
The Mechanical Services O&M Manuals and design documentation provide a reliable reference for the operation and maintenance of the reconfigured mechanical services, supporting ongoing compliance with the National Construction Code, relevant Australian Standards and manufacturers’ maintenance requirements. By clearly documenting the relationship between the existing base-building services and the new tenant systems, the project provides facilities managers with the information needed to efficiently manage the mechanical assets throughout the life of the fitout.
The content in this case study has been informed by project documentation and client communication provided to Dewick & Associates during and following the completion of the project. Where external sources have contributed to our understanding of relevant standards or industry practice, these are listed below.
Image generated by Gemini AI, 2026. Royalty free. Conceptual image based on the project location.
Note: Some content in this case study draws on a combination of sources rather than direct quotation. Where this is the case, contributing sources are acknowledged above rather than cited inline.
Technical authoring of D&A format O&M Manuals enabling efficient plant operation and effective maintenance for equipment longevity, including:
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