Multiplex achieves Victoria-first sustainability milestone

by Helena Morgan
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The global construction company’s delivery of a $1 billion commercial office tower in the Melbourne CBD is set to be one of the most sustainable builds in its history. 

In collaboration with acclaimed integrated property investor and developer Cbus Property, Multiplex is planting a 48-storey commercial office tower in the hustle and bustle of the CBD at 435 Bourke Street. 

The build fulfils a Victoria first, with the use of Hydrotreated Vegetable Oil (HVO100) renewable diesel, in addition to the tower’s façade – akin to a ‘solar skin’ – being the largest application of its kind to date in the Melbourne CBD and one of the first towers in the world. 

Multiplex is no novice to sustainable building – the company was proud to be the first contractor in the world to sign the World Green Building Council’s Net Zero Carbon Buildings Commitment in 2019.

People-centric infrastructure 

435 Bourke Street will absorb the recently demolished 40 and 150 Queen Street and 27 McKillop Street sites to create new pedestrian routes. 

Cbus Property’s chief executive officer Adrian Pozzo says the office tower’s construction aligns with the company philosophy of providing sustainable infrastructure that places people at the heart of a build. 

“435 will enable a diversity of experiences and working environments that respond and adapt to dynamic and evolving customer requirements,” says Pozzo. 

Ambitious green targets

Designed by renowned architecture practice Bates Smart, 435 Bourke Street’s construction is guided by the admirable goal of reducing embodied carbon emissions by 30 percent. 

“As a business we’ve committed to having a positive and material impact on the environment and that means finding ways to reduce embodied carbon in our projects,” says Multiplex regional managing director Ross Snowball. 

By using HV0100 renewable diesel, the build also aims for the on-site power to be 100 percent renewable energy, alongside the building’s structure being built with low-carbon concrete and low-carbon reinforcement. 

Cbus Property is hoping the ‘solar skin’ will set a new precedent in net-zero carbon operation and earn the predicted 5.5 star National Australian Built Environment Rating System (NABER) Energy rating and 6 Star Green Star Buildings rating. 

Vertical village 

435 Bourke Street – encompassing 60,000 square metres of office space, 1300 square metres of street-level retail space and a five-level basement area – intends to function as a ‘vertical village’ and house over 5500 city workers looking for pandemic-fuelled hybrid work routines.

Pozzo says the tower responds to a collective desire for a nourishing work/life balance. 

“435 Bourke’s sky garden, ground plane and mixed-mode terraces and atrium-style physical and visual connectivity sets an incredible new benchmark for diverse and naturally ventilated extensions of traditional workspaces,” says Pozzo.

The project will generate 3500 jobs over the course of the nearly three years – completion expected in the fourth quarter of 2026 – specifically in marginalised and underfunded cohorts and demographics.   

Renders supplied by Cbus Property. 

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