423 ÎLOT A3

Îlot A3
Lyon, France
Project 2013 - planned completion 2017

Herzog & de Meuron designed the master plan for Lyon Confluence on the Rhone river side (ZAC II) between 2009 and 2011 and have been supervising the urban development since then. The project proposes 14 “îlots” of approximately 100 buildings mixing uses and typologies. Îlot A3 is the first “îlot” in the new Confluence district “Quartier du Marché” to be developed as a pioneer for the entire area. Herzog & de Meuron acted as “Architecte en Chef d’Îlot” for the translation of urban guidelines into architecture.


Îlot A3 consists of an open block of 8 buildings with housing, offices and retail designed by 6 offices including AFAA, Tatiana Bilbao, Manuel Herz, Christian Kerez, Herzog & de Meuron and Michel Desvigne as landscape architect. In the center of the block there is a garden courtyard with a day care. The introduction of 16 floor-high towers in the master plan simultaneously offers the possibility to keep a relative high density as well as having small-scale buildings of 3 stories. Thus, it provides a variation of scales within the same block.


The residential tower on Îlot A3 is designed by Herzog & de Meuron. The volume is a simple extrusion defined by rounded loggias in the corners. The curved mineral facade has single and repetitive square openings. Its appearance relates to the very structured and homogenous facades of the buildings in the old town of Lyon. As opposed to the curves of the concrete, windows and sunshades are combined in a polygonal metallic frame specifically developed for the project. Their position follows the rectilinear grid of the floorplan. The geometry of the metallic window frames offers the possibility to use the shading system when the tilting window is open.


Herzog & de Meuron Team:

Partners: Jacques Herzog, Pierre de Meuron, Christine Binswanger (Partner in Charge)

Project Team : Christoph Röttinger (Associate, Project Director), Emmanuel Guilloux (Project Manager), Claire Gamet (Project Manager), Delphine Camus, Chloé Eckert, Shusuke Inoue, Sara Jimenez, Antoine Meinnel, Alexa Nürnberger (Associate), Romain Péquin



Design Consultant: Herzog & de Meuron, Basel, Switzerland

Executive Architect: AFAA, Lyon, France; PSO Ingénieurie, Serrieres, France; ELAN, Limonest, France

Structural Engineering: Batiserf, Fontaine, France; Arcoba, Limonest, France

Acoustics: Synacoustique, Lyon, France

Cost Consultant: Iliade, Caluire et Cuire, France

Sustainability Consultant: Etamine, Vaulx en Velin, France

Fire Security / Code: Veritas, Paris, France

MEP Engineering: Iliade Setam, Caluire et Cuire, France



Facade Engineering: EPPAG, Münchenstein, Switzerland



General Contractor: Leon Grosse, BRON, France

Electrical: CNE, Vaulx en Velin, France

Plombing Ventilation: Patricola, Montany, France


Residential Tower Unit Mix:

71 apartments

23 small - 45m2

28 medium - 70m2

20 large – 90m2


Îlot A3:

2 Office buildings of 6676 m2 and 2805 m2 GFA

2 Residential buildings including 140 apartments

4 Social housing buildings including 94 apartments

1 Daycare

135 Parking lots

1672 m2 of retail