Exterior shot looking up at 9 Castlereagh Street, Sydney.

Exterior of 9 Castlereagh Street, Sydney. Photograph courtesy of Steensen Varming

Steensen Varming at 9 Castlereagh Street

Sunday 3 November 2019

9 Castlereagh Street, Sydney

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Harry Seidler

Additional architects

Harry Seidler & Associates (2010-11)

Designed in 1984 by the modernist architect Harry Seidler, 9 Castlereagh Street was built as the prestigious city headquarters of a major financial organisation and features a daring exposed steel vertical truss on the street elevation supporting column-free interiors behind. The position of the lift core internally was also unusual at the time, aiming to maximise the available unimpeded space on each floor. Lifts occupy an increasingly large amount of floor area in tall office buildings. Seidler was known for structural innovations and was a master of steel construction.

The building was also innovative in its full-height internal atrium providing daylight to every floor on a tightly bounded, sunless site and featuring hanging gardens at a number of intermediate levels. As with many of Seidler’s commercial buildings, commissioned artwork is an important element of the total composition – in this case a large tile mural created by ceramicist Lin Utzon.

Danish firm Steensen Varming opened an Australian office in 1957, initially to design the mechanical systems of the Sydney Opera House with architect Jørn Utzon. The firm stayed on after the Opera House was completed. In 2010, and true to their core value of sustainability, they moved into offices on level 8 of 9 Castlereagh Street for its green credentials.

In 2018, Steensen Varming was awarded CitySwitch National Signatory of the Year for operating at a high level of energy efficiency and for their effective waste management.


1991 RAIA (NSW) merit award

2012 AIA (NSW) - Commercial Architecture Award, Commendation (for lobby and forecourt enhancements by Harry Seidler & Associates)

2014 CitySwitch - State Winners Under 2000sqm NSW & ACT (Steensen Varming level 8 tenancy)

2017 CitySwitch - State Partnership Winner New South Wales (Steensen Varming level 8 tenancy)

2018 CitySwitch - National Signatory of the Year Under 2000sqm (Steensen Varming level 8 tenancy)

  • Steensen Varming at 9 Castlereagh Street, Landscaped forecourt with Lin Utzon mural in the background.

On Sunday 3 November

What’s open?

Plaza & level 8.

Talks, tours & more

A video featuring Harry Seidler & Associates will be playing on level 8.

to know

  • Photography restricted
    No photographs of desks or work on Level 8.

  • Toilets available

  • Pram friendly

  • Accessible

Opening hours

9am - 4pm

Last entry



9 Castlereagh Street, Sydney

Entry via

Between Martin Place and Hunter Street


Steensen Varming's involvement in Sydney Open has been made possible by Charter Hall.