Southern Cross Electrical Engineering Limited announced that its Heyday subsidiary has been awarded the electrical services design and construct contract for the Atlassian Australian HQ building development in Sydney by the Built and Obayashi Corporation Joint Venture, on behalf of Dexus. The contract value is over $35 million. The project is located at 8-10 Lee Street, Sydney, adjacent to the Central Rail Station, and anchors the NSW Government's Tech Central precinct that will create a new international innovation and technology community.

The building will be the world's tallest hybrid-timber building at 39 storeys high, distributed across eight different habitats with 75,000 square metres of gross floor area. The development will include new YHA Railway Square accommodation (137 rooms and approximately 480 beds) within its lower levels and the heritage Parcels Shed at the YHA will be incorporated into the design, together with retail spaces and a new public realm around the station. The building will have an innovative glass and steel exoskeleton, incorporating an electricity generating façade system with self-shade capabilities, to reduce heat gain within the building.

Sustainability targets for the development include a 50% reduction in embodied carbon for the substructure, superstructure and facades compared to a conventionally constructed building, a 50% reduction in operational energy compared to a conventional building, and the use of 100% renewable energy to power the building. Additionally, it has a 5.5-star NABERS Energy Commitment Agreement and targeting a 6-star Green Star rating. Heyday is expected to start immediately and completion is anticipated in late 2026.