The Calyx

CompanyPTW Architects
Lead DesignerTroy Uleman
ClientPTW Architects
Project LinkView
Prize(s)2nd Place in Architecture Categories / Exhibits, Pavilions and exhibitions
Entry Description

Unveiled on the Royal Botanic Garden’s 200th birthday,
the Calyx is a landmark horticultural, research and
education space that showcases ever-changing
Central to the Calyx’s design concept was an aspiration to
create a ‘jewel in the Garden’, a serene and peaceful
building in its distinctive setting, yet one with flexibility for
ever changing public exhibitions and events.
The geometry of the existing 1988 Arc Glasshouse,
designed by Ancher Mortlock and Woolley led by
renowned Australian Architect Ken Woolley, guided the
architectural development of the Calyx. In co-operation
with the landscape architects Mc Gregor Coxall and
builders Cockram Construction, the quality, integrity and
innovation of the existing structure was retained and
The circular steel structure of the ‘Iris’ is the most highly
visible element of building. Accommodating the foyer,
education and retail outlet this circular space, with its
retractable walls can be turned into an evening event


PTW Architects has a rich legacy of significant, enduring projects since the practice’s commencement in 1889.

With the geographic advantage of interaction and experience between offices in Sydney, Beijing, Shanghai, Hanoi and Ho Chi Minh City, PTW’s 200 talented architects and designers work collaboratively and cross-culturally in dynamic, multi-lingual teams of capability and expertise across a diverse range of project types in Architecture, Interior Design, Urban Design, Masterplanning and Infrastructure.

Awards and Prize

PTW Architects' architectural achievement has been recognised repeatedly throughout its history. In 1930, the firm won the inaugural Sulman medal (the highest honour awarded by the Royal Australian Institute of Architects) for Science House, Sydney. It won this award again in 1952 for the Royal Swedish Legation, Canberra. Our recent awards are listed below:

Good Design Awards, Good Design Selection in Architectural Design Category – The Calyx
Property Council of Australia / Rider Levett Bucknall Innovation and Excellence Award, Best Mixed Use Development – Pacific Bondi Beach

UDIA Excellence in Mixed-Use Development - Discovery Point
UDIA Excellence in High-Density Development - Alexander, Barangaroo South
Urban Taskforce Development Excellence Awards, Development of the Year – Pacific Bondi Beach
Urban Taskforce Development Excellence Awards, Mixed Uses Development – Mascot Central
Urban Taskforce Development Excellence Awards, Medium Rise – City Apartments Development – Alexander, Baranagaroo South