«Platform» Office Building

In the immediate vicinity of Hardbrücke railway station, the seven-story office building called Platform completes the ensemble comprising the high-rise Prime Tower and its annexes Cubus and Diagonal. The building’s volume, with various angles, reacts to the urban situation, providing a coherent link between the station and the new central square. A two-story-high passage through the building connects the square with the public pedestrian and bicycle path along the side of the tracks as well as with the new pedestrian underpass to Hardbrücke Station. In addition, the passage acts as a generous covered area outside the entrance foyer.

With its pronounced horizontal and layered design, the building contrasts with the Prime Tower nearby, effectively forming its reclining counterpart. As in the tower, the stories increase their floor area as the building rises, made possible by various projections. the volume of the building is also subdivided by courtyards that cut into the west and south sides and ensure well-lit office spaces within, as well as by the angular projections in the façade.

The central, prestigious entrance foyer forms an additional internal open area. A tall atrium flooded with natural light links the entrance level with the office floors above. Its function as a hub that lends the building its identity is additionally underlined by the open staircases and adjoining seating areas on the office floors. Dark glass balustrades mirror the space and the light in multifaceted reflections, creating a kaleidoscope effect.

Next to the entrance foyer on the ground floor are a restaurant, a cafeteria, and an auditorium. A wide, inviting staircase leads from the entrance level to the customer lobby on the first floor, from which the various conference rooms can be accessed. the levels above provide office space for around 1,000 staff. Although the building has been conceived as a corporate headquarters, the positioning of core facility areas permits a variety of office typologies if required in the future, including the division of each floor into a maximum of four separate rental units. Wall and ceiling paintings by Nic Hess, wallpaper and drapes by Lachmayer/Nobis and a textile sculpture by Ernesto Neto complete the interior.

To be able to meet changing spatial needs or different uses without radical structural alterations, the building has been designed as a load-bearing skeleton structure with reinforced cores.

The glazed façade is articulated by horizontally layered bands of parapets and windows. The double windows hold sunblinds in between and help reduce noise from outside. The inner windows can be opened for ventilation purposes toward the interim space of the double-skin façade. The slightly reflective outer glazing shell and parapets accentuate the building’s folded structure.

Location Zurich, Switzerland

Programme Seven storeys office building, 1'000 workplaces, atrium as central entrance hall, restaurants, shops, auditorium

Commission 2007

Planning/Construction 2007–2011

Client Swiss Prime Site AG, Olten

Gross Floor Area 28‘853 m2

Team G/G Christian Maggioni (Team Manager), Franziska Bächer (Project Manager from 11/ 2007), Stefan Thommen (Project Manager until 06/ 2007), Christoph Rothenhöfer (Project Manager until 05/ 2007), Markus von Dellingshausen, Philippe Volpe, Karla Pilz, Armin Baumann, Pieter Rabijns

Total Contractor HRS Real Estate AG, Zurich

Landscape Architecture Schweingruber Zulauf Landschaftsarchitekten, Zurich

Structural Engineer Planning: ARGE Dr. Schwartz Consulting AG, Zug and Dr. Lüchinger + Meyer Bauingenieure AG, Zurich and Freihofer & Partner AG, Zurich
Construction: Ribi + Blum AG, Romanshorn

Electrical Engineer Planning: IBG B. Graf Engineering AG, St.Gallen
Construction: Herzog Kull Group Zürich, Schlieren

Building Physics Engineer BAKUS GmbH, Zurich

Heating/Cooling Planning: PB Peter Berchtold, Ingenieurbüro für Energie und Haustechnik, Sarnen
Construction: Lippuner Energie- und Metallbautechnik AG, Grabs

Ventilation Engineer Waldhauser AG, Münchenstein

Lighting Consultant Planning: Ernst Basler + Partner, Zurich
Construction: Regent, Zurich

Plumbing Planning: PB Peter Berchtold, Ingenieurbüro für Energie und Haustechnik, Sarnen
Construction: Huustechnik Rechberger AG, Zurich

Facade Planning: gkp fassadentechnik ag, Aadorf
Construction: Fahrni Fassadensysteme AG, Lyss

Furnishings Gigon / Guyer Architekten, Zurich
workspaces intern: Off Consult, Zurich

Art within Architecture Nic Hess, Zurich
Herbert Lachmayer and Margit Nobis, Vienna, Austria
Ernesto Neto, Brazil

Photos © René Dürr
© Walter Mair
© Shinkenchiku-sha, Tokyo
© Thies Wachter
© USM Möbelbausysteme / Dani Suter