Sydney Architecture Images- Contemporary Commercial

1 Bligh Street (originally known as "Space")


Ingenhoven-Overdiek, Architectus.


1-9 Bligh Street




Millennium Minimalist Modernism


reinforced concrete frame, curtain wall glazing. 30st/140m/off. 6 Star Greenstar rating.


Office Building
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The oval shaped tower will have a full height atrium running up centre of tower. Its glazing will be Australia's first transparent highrise facade which will also be double skinned to allow natural ventilation. Will also have a 20m high glass foyer.
Designed by award winning german architects-
1 Bligh Street achieves world leadership 6 Star Green Star

Mon 29 Mar, 2010 Industry News

1 Bligh Street achieves world leadership 6 Star Green Star and highest rating in Sydney.

Co-owners of 1 Bligh Street DEXUS Property Group, DEXUS Wholesale Property Fund and Cbus Property today announced that the 1 Bligh Street office development in Sydney has been awarded a 6 Star Green Star Office Design v2 Certified rating.

1 Bligh Street has also been awarded the highest Green Star rating score in Sydney/NSW, which includes the maximum allowable five points for innovation in categories such as environmental design initiative and exceeding Green Star benchmarks.

DEXUS CEO, Victor Hoog Antink said “Every aspect of 1 Bligh Street, from Australia’s first high rise double skin facade to the unique full building height naturally ventilated atrium, is designed to optimise sustainability and tenant amenity throughout the 28 level development. As co-owners, we are delighted that our vision to deliver the next generation of sustainable office buildings has been recognised through the achievement of a world leadership 6 Star Green Star rating.”

The double skin façade system is a major contributor to the 6 Star Green Star rating and allows the energy consumption of the building to be kept at a minimum, and facilitates the energy performance to be maintained at 5 Stars NABERS Energy levels with a 42% CO2 reduction when compared to a similar sized conventional office tower.

Other innovations which contributed to 1 Bligh Street’s leading score and sustainability credentials include:

the solar cooling system which feeds into the tri-generation system that reduces the strain on the CBD grid infrastructure by a further 25% and provides free cooling for the building
the specially formulated high strength concrete used and the column design which reduces the number of columns, and therefore minimises the amount of concrete used
the first use of a black water recycling in a high rise office building that will save 100,000 litres of drinking water a day, equivalent to an Olympic swimming pool every two weeks
state-of-the-art water efficient fittings, rainwater harvesting and fire system water reuse
all timber and plywood used in the structure is recycled or from FSC accredited sources
90% of all steel used in the project comprises more than 50% recycled content

80% of all PVC type products have been replaced with non PVC materials
Grocon CEO, Daniel Grollo, who is also a founding member of the GBCA, said he was proud that all involved had shown world leadership on this project. “This is a fantastic project in the centre of Sydney and symbolises a new way forward in sustainability features,” he said.

“The use of unique high strength concrete with a lower cement content means there is 5,768 tonnes less of carbon dioxide being released into the atmosphere and to date, we have recycled 37,000 tonnes or 94% of all construction waste produced on the project.”

Green Star is a comprehensive, national, voluntary environmental rating system undertaken by the Green Building Council of Australia (GBCA) that evaluates the environmental design and construction of buildings. The 6 Star Green Star Rating is the highest awarded by the GBCA.

“We congratulate the co-owners DEXUS Property Group, DWPF and Cbus Property for this world class achievement,” says the Chief Executive of the GBCA, Romilly Madew. “Achieving five innovation points (out of five) reflects that 1 Bligh Street is a truly ground-breaking green building. Following DEXUS’s 123 Albert Street in Brisbane receiving a 6 Star Green Star and DEXUS’s/Cbus Property’s pursuit for sustainability throughout their respective portfolios, 1 Bligh Street further confirms the co-owners’ commitment to sustainability and green building innovation.”

When 1 Bligh Street is completed in May 2011 the building will provide a new benchmark for sustainable office space. 1 Bligh will provide the highest levels of tenant amenity including spectacular views in all directions, in particular, the premium northern aspect over Sydney Harbour and Circular Quay.

The unique full height atrium and elliptical shaped floor plates enables 74% of the building to be within 8m of either the façade or the atrium, providing large amounts of natural light into the building and spectacular views in all directions. Occupying a premium corporate address in the heart of Australia’s financial capital, 1 Bligh will be a striking new addition to the Sydney skyline.
For further information contact:

DEXUS/DWPF/Cbus: Emma Parry 0421 000 329
Grocon: Jane Wilson 0407 831 456

Info from the architectus website-

The structure delivers consistent large floor plates of up to 1600m2 and achieves 92 per cent efficiency Nett Lettable Area to Floor Space Area.
Forty per cent of office space is within 4.5 metres of the facade with 1000m2 contiguous column-free space creating high potential for office layout flexibility. The elliptical plan is 12 per cent more efficient than a rectangular building in facade to floor area and allows excellent natural light penetration. The 120 metre high central atrium makes dynamic views accessible to all.

1 Bligh St - also known as Space - features a transparent elliptical shape and double skin façade.

Artist's impressions of 1 Bligh Street, Sydney (left); Cross section showing air movement through the atrium (right).
Source: Architectus



Artist's impression of internal space
Source: Architectus

1 Bligh St (also known as Space) will be 28 storeys high and has a total of 42 000 square metres of floor space. Dexus Property Group, one of Australia's largest property fund managers, is the owner, developer and investor. The building features a double skin façade and a range of progressive environmental design features, including the potential for natural ventilation, atriums and a range of energy and water initiatives.

The building will capture views to Circular Quay, Sydney and is due for completion in early 2011.

Owner: Dexus Property Group
Developer: Dexus Property Group
Investor: Dexus Property Group
Project Team Members:

  • APP (project manager)
  • Ray Brown of Architectus in association with Christoph Ingenhoven of Ingenhoven Architects (architects)
  • Enstruct Group (structural)
  • Arup and DS-Plan - Advanced Building Technologies (façade)
  • Arup (electrical, mechanical and acoustic)
  • Arup, Steve Paul and Partners (Hydraulic and fire)
  • Sue Barnsley Design (landscape)
  • Cundall (ESD consultant)
  • Ryder Hunt (cost consultant)

Checklist of sustainable features

Indoor Environmental Quality

Motivations and lessons

The designer's view - an interview with Ray Brown, Architectus

1 August 2007

What are the main reasons why your company chose to do a sustainable building?

It's our preferred mode of operation and we have a long history of environmentally conscious buildings. It's just what we do.

What are the best things that have come out of doing a sustainable building?

We've been able to pursue innovative and holistic solutions in terms of the energy, sun shading and thermal comfort. In general we've had a holistic approach to the indoor environment quality.

What are the things that you did that made the project work well?

Detail air movement of double
skin façade at 1 Bligh Street
Source: Architectus

There's a range of initiatives:

  • The double skin façade allowed us to have a 100% shading solution while maintaining the views in most sections. The double skin has internal adjustable blinds.
  • The building has been designed for the potential of natural ventilation to the perimeter of the building. But this feature is a tenant upgrade (considered in more detail in the next question).
  • The treatment of water has certainly been a priority. Black water is treated on site and the water is used for landscape features such as the green walls and also for toilet flushing and cooling towers.
  • There's a cogeneration plant in the building and also solar tubes for creating solar cooling.
  • The atrium is another key element of the building and allows natural light deep into the floor plate. It adds a social hub and focus to the building and has balconies that project into the atrium to provide naturally ventilated break out spaces. Each floor has balconies between 30-50m projecting into the atrium.

    Typical floor plate showing layout and atrium (left); Cross section of the atrium (right).
    Source: Architectus

What were the things that didn't work quite so well and how were they managed?

We're still in design, so obviously still working through the project. I guess we've got a very willing client but there's a disconnection between the end user for design purposes and the unspecified tenant that will occupy the building. This has two aspects.

Firstly, there's no ability to plug directly into the environmental aspirations of the would-be tenant when pitching to a wide market. In this case we may be missing opportunities if the actual tenants have very high aspirations.

Secondly, the performance of the design is largely dependent on the fit-out and how the tenants operate the building. Whatever you do in the base building is commendable but it comes down to the commitment of the tenants to achieve the star rating with the fit-out and use of the building. They may use a lot of air conditioning and be a power hungry tenant so it's very important the tenants are also educated. If you are going into a six star building then you want to have a six star fit-out. The building we're currently doing has the potential to be naturally ventilated, but, it is dependent on the fit-out from the tenant. The fit-out they choose could make the building fully air conditioned.

The biggest change has to happen in the property market. A big problem is the way the tenant's representative grade the buildings. Premium building standards require a a comfort band of 22-24 degrees Celsius and this needs to be discussed. It costs a lot of energy to achieve such a narrow band. A more realistic band would be, say, 22-26 degrees Celsius. This would save a lot of energy if the temperature outside is 35 degrees.

Other information and resources on 1 Bligh Steet

Green as an Aussie Cucumber, Tina Perinotto, Australian Financial Review, 18 July 2007

Dexus Property Group Sustainability Reporting

Space 1 Bligh

In the heart of Sydney’s traditional financial precinct and with views to Sydney harbour, this Premium-grade office building has been designed by Architectus, in association with Ingenhoven Architects, to combine the best in innovative technology and sustainability.

Space 1 Bligh will offer tenants the next generation in workspace design featuring a naturally ventilated, full-height atrium creating connectivity between floors. Other features include a large, sun-filled forecourt, entry hall and child care centre, a mid-level wintergarden and roof terrace.

The building comprises 42,000 square metres of floor space over 28-storeys with typical floors of about 1,600m2.

Environmental credentials

Space 1 Bligh has been designed to achieve a 6-star Green Star Rating and a 5-star Australian Building Greenhouse Rating (ABGR).

Contributing to Space 1 Bligh’s green credentials is its distinctive double skin façade design. The transparent facade comprises two layers of glass which are separated by a naturally ventilated cavity. The cavity contains adjustable automatic blinds to shade the internal layer of glass at critical times of the day, dramatically reducing solar heat gain and glare while maintaining harbour views.

Black water recycling, rain water harvesting for irrigation, gas generated energy for cooling, heating and electricity, and roof-mounted solar panels for electricity also contribute to Space 1 Bligh’s environmental rating.

The building is set to create a new benchmark in Australia for sustainable high rise and provide an enduring presence attuned to emerging cultural, social and environmental values.

If you would like to receive a more detailed case study of this project please email

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