Hotel and Office Building – Greencity

The mixed-use district Greencity, based on the principles of the 2000-watt society*, is under development on the former industrial site Sihlpapier Manegg in southern Zürich. Situated between the railroad tracks and the motorway, the seven-storey hotel and office building together with its eleven-storey neighbours forms the head of the new district facing the city centre. This ensemble frames a public courtyard, adjoining the elongated Maneggplatz. The oblong, lower building faces the tracks and street to the west as well as the courtyard. The latter is widened to piazza-like proportions by a tapering of the volume towards the north. Three covered recesses lead to the entrance halls of the different occupants. On the façades, overlapping horizontal and vertical elements of brown anodized sheet aluminium alternate with wood/metal windows and slender ventilation flaps. Depending on the point of view, openings and cladding, structure and envelope interpenetrate.

The international design competition for the site was based on a preliminary plan that stipulated tall building volumes next to the motorway for offices and services. Gigon / Guyer’s urban design was awarded first prize and further development was split between two architecture firms.

The present project was initially planned exclusively as office space, and in a second phase, exclusively for hotel use. The uses are now combined: one-third office space, two-thirds hotel. The office space occupies the southern part of the upper floors and includes a lobby, staircase and lift core. The ground floor here houses a day-care centre with a separate entrance. The hotel reception welcomes guests on the street side, whereas the breakfast room and bar face the courtyard.

A load-bearing skeleton of concrete columns, floor slabs and cores allows for various uses. The façade reflects the flexible partition grid of the floors as well as the construction, but at the same time this is overridden by the subtle offsets of the cladding, window frames and ventilation flaps between storeys. The tilting of the metal profiles contributes to multiple readings of the façade – creating impressions that are suitable both for the offices and the hotel.

In accordance with the core-and-shell model, hotel and office tenants fit out their own spaces. However, lobbies, staircases and lift cores, connecting outside and inside, lower and upper floors, are coherent in appearance: polished concrete flooring echoes the load-bearing structure, while dark brown metal surfaces refer to the building envelope.

* Up to 2000 people will live in Greencity, 3000 will work or study there. Among the goals are a commitment to mostly renewable energy sources, eco-friendly mobility thanks to the central suburban railway station, numerous bicycle parking spaces and open, car-free spaces in the district.

The ambitious energy specifications are met by the building through the use of geothermal heating, insulation layers of 20–24 cm, as well as photovoltaic panels on the roof. In the office spaces, heating and cooling ceiling elements, which also include ventilation inlets, provide efficient distribution. Exhaust air is centrally extracted at the cores. The hotel rooms are heated and cooled with pipes embedded in the ceiling rendering; the air ducts are installed above the prefabricated bathrooms. These and other measures ensure that the building can be LEED Platinum certified.

Location Zurich, Switzerland

Programme 7-storey hotel and office building, day-care centre, hotel with 174 rooms, 594 beds (Core and Shell: Gigon/Guyer, Interior fit-out: tenants), underground parking

Competition 2012, 1st Prize

Planning/Construction 2016–2021

Client Client: Losinger Marazzi AG, Zurich
Owner: Credit Suisse Anlagestiftung, Zurich

Gross Floor Area 16‘505 m2

Team G/G Planning/Construction: Christian Maggioni (Team Manager 01/2015–), Barbara Schlauri (Team Manager –12/2014), Damien Andenmatten (Project Manager), Chiara Giovanola Competition: Michael Winklmann (Team Manager 08/2012), Stefan Thommen (Team Manager –07/2012), Karla Pilz, Thomas Möckel, Lena Ehringhaus, Natalie Koerner

Construction Management Losinger Marazzi AG, Zurich

Total Contractor Losinger Marazzi AG, Zurich

Landscape Architecture Vogt Landschaftsarchitekten, Zurich

Structural Engineer Wismer + Partner AG, Rotkreuz

Electrical Engineer IBG B. Graf AG Engineering, Baar

Building Services Engineer Balzer Ingenieure AG, Winterthur

Building Physics Engineer Gartenmann Engineering AG, Zurich

Fire Engineer Gruner AG, Zurich

Photos © Seraina Wirz

Replacement of Hangenmoos Housing Estate

Location Wädenswil, Switzerland

Programme 289 apartments, 1 shared apartment for assisted living Foundation Bühl (4 combined apartments), double kindergarden, common room, 7 office spaces

Competition 2-phases, 2014

Planning/Construction 2015–2021/ 2023

Client Hangenmoos AG, Wädenswil

Gross Floor Area 63‘100 m2

Team G/G Planning/Construction: Christian Maggioni (Team Manager), Daniela Schadegg (Project Manager), Franziska Bächer, Stefanie Bittig, Christoph Dober, Andy Gratwohl, Dana Hemmi, Leyla Ilman, Lilla Kis, Christoph Lay, Carlo Magnaguagno, Lukas Taller, Urh Urbancic, Philippe Volpe
Competition: Stefan Thommen (Team Manager), Rodrigo Jorge, Andy Gratwohl, Leyla Ilman
Competition Revision: Stefan Thommen (Team Manager), Thomas Möckel, Leyla Ilman, Christoph Dober, Milica Vrbaski

Construction Management Hotz Partner AG SIA, Wädenswil

Landscape Architecture Commissioned Study: Studio Vulkan Landschaftsarchitektur GmbH, Zurich
Planning: vetschpartner Landschaftsarchitekten AG, Zurich

Structural Engineer WaltGalmarini AG, Zurich

Electrical Engineer Enerpeak AG, Dübendorf

Building Services Engineer Polke, Ziege, von Moos AG, Zurich

Building Physics Engineer Braune Roth AG, Binz

Traffic Engineer Enz & Partner GmbH, Zurich

Model Zaborowsky Modellbau, Zurich

Refurbishment of the Herdern High-rise Building

Location Zurich, Switzerland

Programme Refurbishment of listed, 19-storey office building (1 underground, 18 above ground), 500 workplaces, seminar rooms

Competition 2018, 1st Prize Gigon/Guyer Architekten with WaltGalmarini

Planning/Construction 2019–2023

Client Genossenschaft Migros Zurich

Gross Floor Area 9‘948 m2

Team G/G Planning/Execution: Stefan Thommen (Team Manager), Urs Meyer (Project Manager), Milica Brockmann, Luisa Wittgen

Construction Management Spiegel + Partner AG, Zurich

Cost Planning/Scheduling Spiegel + Partner AG, Zurich

Structural Engineer WaltGalmarini AG, Zurich

Electrical Engineer Eplan AG, Reinach

Fire Engineer Migros Engineering Solutions, MGB

MSR Concept-G AG, Winterthur

Heating/Cooling Concept-G AG, Winterthur

Ventilation Engineer Concept-G AG, Winterthur

Facade Reba Fassadentechnik AG, Chur

New Social Insurance Centre WAS (Wirtschaft Arbeit Soziales)
Areal Eichhof West

Location Kriens, Switzerland

Programme Offices 700 workplaces, seminar rooms, canteen, cafeteria

Competition 2020, 1st Prize

Planning/Construction 2020–2024

Client WAS Immobilien AG

Gross Floor Area 22‘759 m2

Team G/G Stefan Thommen, Lukas Kübli, Dario Caccialupi, Jan Zimmermann

Structural Engineer EBP Schweiz AG, Zurich

Building Services Engineer EBP Schweiz AG, Zurich


Swiss Museum of Transport – Multi-purpose Building with Exhibition Hall and Offices

Location Lucerne, Switzerland

Programme Exhibition space, conference rooms, offices, shop

Commission 2017

Planning/Construction 2017–2023

Client Swiss Museum of Transport, Lucerne

Gross Floor Area 8'000 m2

Team G/G Planning/Construction: Christian Maggioni (Team Manager), Philippe Volpe (Project Manager), Chee Xu, Milica Brockmann

Construction Management Büro für Bauökonomie, Lucerne

Structural Engineer Schubiger AG Bauingenieure, Lucerne

Electrical Engineer Scherler AG, Lucerne

Building Physics Engineer RSP Bauphysik, Lucerne

Fire Engineer GRP Ingenieure, Lucerne

Visualization Indievisual, Zurich

Extension Josef Albers Museum Quadrat

Location Bottrop, Germany

Programme Exhibition space, museum education, depot, workshop, library, office, material storage, technique

Competition 2016, 1st Prize

Planning/Construction 2017–2021

Client Stadt Bottrop, Fachbereich Immoblienwirtschaft

Gross Floor Area 1‘963 m2

Team G/G Planning/Construction: Pieter Rabijns (Team Manager), Philippe Volpe
Competition: Stefan Thommen, Sarah Haubner, Daniel Hurschler

Construction Management pbr Planungsbüro Rohling AG, Osnabrück, Germany
Project Management: Kempen Krause Ingenieure GmbH, Cologne, Germany

Landscape Architecture Büro Drecker, Bottrop, Germany

Structural Engineer pbr Planungsbüro Rohling AG, Frankfurt am Main, Germany

Electrical Engineer pbr Planungsbüro Rohling AG, Osnabrück, Germany

Building Physics Engineer a°blue GmbH, Hamburg, Germany

Fire Engineer Das Ingenieurhaus Borgert Keller Witte, Bornheim, Germany

Acoustical Engineer a°blue GmbH, Hamburg, Germany

Lighting Consultant Institut für Tageslichttechnik Stuttgart, Germany

Address Im Stadtgarten 20, D – 46236 Bottrop, Germany