OFFICELEBONCOINBUILDING 22-24 RUE DES JEUNEURS 75002 PARIS
33 4 SITUATION PLAN ÉTOILE LE LOUVRE UFO
33 8 UFO — HEADQUARTERS OF THE LEBONCOIN GROUP: A STRIKING ARCHITECTURAL STATEMENT IN THE SENTIER DISTRICT PROGRAM Complete remodelling of an office building LOCATION 22-24 rue des Jeuneurs 75002 PARIS AREA 8,000 m² CERTIFICATION HQE EXCELLENT, BBC, BREEAM EXCELLENT, WIREDWELL, SCORE DahlAxel©
T he Austrian bank Raiffeisen Immobilien commissioned Axel Schoenert architectes to completely renew and remodel the UFO office building located at 22-24 rue des Jeuneurs in Paris’s second arrondissement.
UFO’s courtyard has become a quiet green oasis whose patio and terraces offer a calm place to breathe in the hustle and bustle of the Sentier.
Ageing and rather austere in appearance, the original 1970s concrete office complex had become obsolete after successive refurbishments had robbed it of its character and prestige. The 18-month remodelling operation has not only given the building a new image but also rationalized and optimized its internal layout, offering future users an attractive and highly flexible workspace. In the 19th century, the Sentier neighbourhood became known as a textile hub specializing in woven fabric, an historic association that is reflected in the building’s façade with its weft and warp of horizontal and vertical lines. This new building envelope brings out the building’s intrinsic qualities, transforming it into a modern workplace that acknowledges the urban context while respecting its original form. It also allows light and air to break up the rather monolithic aspect of the block, allowing glimpses of interior spaces and greenery. Complete remodelling and renovation of the building U-shaped, with a concrete slab-and-column structure, the building rises six storeys above grade and descends seven below (car parking), with a total floor area of 8,000 m². It also enjoys a roof Becauseterrace.of the building’s location in a dense neighbourhood, construction work was complex, the crane being mounted on the building’s roof due to lack of space. Furthermore, before remodelling could begin, lead and asbestos had to be Floorremoved.areain the renovated building is around 10% greater than before: this was achieved by reorganizing the ground floor and by adding a mezzanine level on the final storey. At ground level, the building’s base has been freed up through the creation of a double-height doubleaspect hall, which ensures a certain visual porosity in the neighbourhood, particularly in the rue des Jeuneurs, where the new main entrance will be located.
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The main challenge was to modernize the building so as to transform it into an architectural statement in the heart of the Bourse-Sentier district that will contribute to the energy and effervescence of the nearby Grands Boulevards.
The building’s courtyard has become a patio garden laid out in cascading terraces, with a planted wall that rises almost 7 m. All the courtyard façades are entirely glazed, allowing the building’s green beating heart to be enjoyed from inside. To open up the building to the exterior and provide light and air to users, a terrace has been created on the second level and the original technical roof has been planted.
©SalemMostefaoui
The brand-new all-glass courtyard façade is characterized by its light and transparency as well as by the five projecting boxes that animate its surface and allow exceptional views onto both the building and the patio. On the final two floors, a sixth metal box stands out through its exceptional dimensions. In place of the thick concrete slabs that formerly clad the lower sills, we now find 2.70-m-high glued glazing panels. Half of the modules can automatically open 5 cm towards the exterior, parallel to the façade, thanks to a system of pantograph mechanisms which allow for natural ventilation and smoke evacuation, all the while forming a guard rail.
33 12 THE FAÇADE DESIGN
Measuring 3.20 m high and 4.68 m wide, the whiteconcrete frames on the street façades feature very fine edges, which vary from 6 cm thick on the second storey to 30 cm thick on the sixth. Special moulds were needed to produce them, and although they were initially intended to be in highperformance fibre-reinforced concrete, traditional concrete was used in the end, requiring precise calculations with respect to the rebars, the thickness between the rebars and the surface, as well as precise modelling of each part so as to ensure correct edge dimensions within a tolerance of only 2 cm. A prototype was made in February 2019, after which several months’ development were needed before production could go ahead. The 200 frames, which reinterpret and modernize the brutalist aesthetic of the original street façades, weigh 3 tons each, meaning that a suitable fixing system had to be devised. To ensure perfect alignment across the entire expanse of the façade, stainless-steel fixing rods were used which allow adjustment in three dimensions (depth, height and width) and transfer the load to the façade.
The courtyard façade
Not only are the panels self-cleaning, they also reduce the production of carbon dioxide by reacting with sunlight, a property that makes them unique in this very urban context. The play of depth and proportion brings a certain lightness to the façade that makes it appear to soar towards the sky.
For Axel Schoenert architectes, the main challenge was to revamp the building’s image. Inspired by brutalism, the three original street façades featured massive prefabricated-concrete mullions and transoms. These 1970s features were removed, and in their stead a curtain wall erected that ensures 21st-century standards of insulation and naturallight penetration. Constructed from gold-tinted anodized-aluminium chassis, and equipped with motorized white blinds, the curtain wall is clad with slender prefabricated white-concrete frames. With its strong horizontals and verticals, this new façade is reminiscent of the looms that were so common to the neighbourhood in the 19th century.
To breathe new life into the original brutalist building, care and attention were lavished on its external envelope. The street façade
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A 10% increase in floor area
SPATIAL REORGANIZATION
In addition to the complete replacement of the façades, a total reorganization of the interior has allowed space to be rationalized and optimized. The main intervention concerns the building’s wide base, in which a double-height through entrance hall has been created on the rue des Jeuneurs. To create this space, part of the concrete floor of the second storey had to be demolished, as did three loadbearing columns.
While one might imagine that demolition of part of the second-storey floor slab resulted in a loss of floor area, in reality the addition of extra square metres at every level on the courtyard side as well as extra height on the top floor for the creation of a mezzanine have resulted in an increase in floor area of around 10%.
The projecting metal boxes that cadence the elevations measure 3.20 m high by 4.68 m wide, in keeping with the dimensions of the façade structure, with the exception of the sixth on the final levels, which measures 6.00 m high by 9.30 m wide. The large metal box on the final two floors is suspended from the building’s concrete frame. Cantilevered 1.40 m out from the façade, this two-storey box required special handling: a concrete beam, 280 x 700 mm in section, runs parallel to the façade and bears the box’s full load. Attached to the steel frame, vertical truss rods support the sheet-metal floor, sealed into the original building’s concrete frame. All of this is invisible from the courtyard: visitors see only steel chassis containing three glass panes measuring 2.80 m wide by almost 6 m high which are held in place by glazing beading.
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Salem©Mostefaoui
For UFO, Axel Schoenert architectes developed an ambitious and effective architectural and office solution that can adapt to the evolution of the workplace as well as fulfilling user expectations and client requirements. With a capacity of 1,000 people, UFO was designed to achieve exceptional environmental performance and has been certified under five standards: HQE EXCELLENT, BBC, BREEAM EXCELLENT, WELL GOLD, WIRED SCORE GOLD. The building is thus perfectly in tune with current environmental challenges and is intended to set an example. Today UFO is the headquarters of the Leboncoin group.
AN EXEMPLARY BUILDING
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33 19 Salem©Mostefaoui
© Salem Mostefaoui©SalemMostefaoui
©SalemSalem©MostefaouiMostefaoui
33 23 TECHNICAL SHEET PROGRAM Complete remodelling of an office building LOCATION 22-24 rue des Jeuneurs, 75002 Paris PROJECT MANAGER Raiffeisen AxelPROJECTImmobilienSUPERVISORSchoenertarchitectes CALENDAR8,000AREAm2 18 months HQECERTIFICATIONexcellent,BBC, BREEAM excellent, WELL Gold, Wired Score Gold GENERAL ENTERPRISE TAKERLegendre Leoncoin : https://leboncoingroupe.com/ IMAGES © Axel Dahl © Salem Mostefaoui
33 24 THE STREET FAÇADE FACADE RUE DES JEUNEURS
33 25 LONGITUDINAL SECTION COUPE LONGITUDINALE A COUPE LONGITUDINALE A CROSS SECTION
33 26 FIRST FLOOR 1 SAS principal 2 Hall d'accueil 543 Local technique 6 Palier ESC/ASC 1110987 stockage 21 511 66 5 56 6 Espace de travail 33 Work contine 4 4 4 11 5 Patio 1 Patio 2 98 Sanitaires 11 Local vélo 7 12 13 12 Sortie parking 13 Entrée parking 0 2 5M REZ-DE-CHAUSSÉE PLANS A 1 SAS principal 2 Hall d'accueil 543 Local technique 6 Palier ESC/ASC 1110987 stockage 511 6 5 6 Espace de travail 3 Work contine 4 11 5 Patio 1 Patio LocalSanitaires2vélo 13 12 Sortie parking 13 Entrée parking 0 2 5M PLANS A
33 27 LEVEL 1 1 Salle de réunion 2 Bureau 09876543 2 5M 1 1 1 22 2 2 Palier ESC/ASC 6 Vide sur patio 1 RDC 8 Vide sur patio 2 RDC 9 Terrasse accessible 6 Syndicaux/CE 33 2 1 2 22 7 VidePassagesurRDC455 NIVEAU 1 PLANS A 1 Salle de réunion 2 Bureau 09876543 2 5M 1 1 22 2 2 Palier ESC/ASC Vide sur patio 1 RDC Vide sur patio 2 RDC Terrasse accessible 6 Syndicaux/CE 3 VidePassagesur RDC PLANS A
33 28 0 2 5M 1 2112 2 2 6 74 6 3321 22 5 1 Salle de réunion 2 Bureau 7543 Palier ESC/ASC6 Vide sur patio 1 RDC Vide sur patio 2 RDC Vide sur la terrasse accessible Zone informelle111 2 NIVEAU 2 PLANS A LEVEL 2 0 2 5M 2112 2 6 3 1 Salle de réunion 2 Bureau 7543 Palier ESC/ASC6 Vide sur patio 1 RDC Vide sur patio 2 RDC Vide sur la terrasse accessible Zone informelle11 PLANS A
33 29 0 2 5M 212 2 2 6 74 6 1 2 22 5 1 Salle de réunion 2 Bureau 7543 Palier ESC/ASC6 Vide sur patio 1 RDC Vide sur patio 2 RDC Vide sur la terrasse accessible Zone informelle111 8 8 Work cafe en double hauteur 9 Local technique 9 10 Terrasse accessible 1010 9 NIVEAU 5 PLANS A LEVEL 5 0 2 5M 212 2 6 1 Salle de réunion 2 Bureau 7543 Palier ESC/ASC6 Vide sur patio 1 RDC Vide sur patio 2 RDC Vide sur la terrasse accessible Zone informelle11 8 Work cafe en double hauteur 9 Local technique 10 Terrasse accessible 10 9 PLANS A
33 LEVEL30 6 EAS EAS 0 2 5M 6 74 6 5 1 Work café 75432 Palier ESC/ASC6 Vide sur patio 1 RDC Vide sur patio 2 RDC Vide sur la terrasse accessible 8 8 Vide sur R+5 9 Local technique 10 Vide sur terrasse accessible 1010 1212 11 Terrasse végétalisée non accessible 1111 9 Zone maintenance 2 12 Terrasse accessible 8 11 Bande stérile 33 3 13 Portillon de maintenance 13 13 NIVEAU 6 PLANS A CS CS 0 2 5M 6 1 Work café 75432 Palier ESC/ASC6 Vide sur patio 1 RDC Vide sur patio 2 RDC Vide sur la terrasse accessible 8 Vide sur R+5 9 Local technique 10 Vide sur terrasse accessible 10 12 11 Terrasse végétalisée non accessible 11 9 Zone maintenance 2 12 Terrasse accessible Bande stérile 3 13 Portillon de maintenance 13 PLANS A
33 31 Isolant IPN 300 mm COUPE HORIZONTALE VERTICAL DE LA GRANDE BOITE METALLIQUE Tirant acier 20 mm Tole aluminium148 mm Montant de façade 189 mm Triple Capotvitragealuminium 20 mm Faux plancherDalleIsolantplancherTolealuminiumbétonexistanteR+6 1405 mm Tole aluminium 1234567891011 SECTION METAL BOX
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Axel Schoenert is recognized and rewarded for his expertise in hotels, office space with iconic performances and design, but also his coworking projects. Resolutely detached from a specific style, effects and trends, each project is studied as a new page to write. The starting point of this work is the place itself, its history, its culture. This anchorage will define the heart of the project, where interior architecture and design are combined with architecture and coexist in perfect harmony.
AXEL ARCHITECTSSCHOENERT AGENCY
Axel Schoenert founded the FrancoGerman agency Axel Schoenert architects with Zsofia Varnagy, interior designer, in 1999, in Paris. With a multicultural team, the agency develops its activities in France and worldwide, in the fields of architecture, interior architecture and design. Its priority is to promote an eclectic vision of its work, to focus on project diversity and to develop an expertise in newly built construction as well as complex refurbishment.
Among its recent projects stand out the refurbishment of SHIFT 54 rue de Londres (winner of the SIMI awards and finalist of the MIPIM Awards), the Belvedere with SPACES in La Défense the business district of Paris, UFO which will host the future Leboncoin headquarters, a building in wooden structure rue Bayard, but also 5 Wework on Paris, including the biggest in Europe (20 000 m2). With its expertise in hotel programs, the agency recently delivered the first French hotel of the German brand 25Hours, a heavy restructuring in front of the Gare du Nord in Paris, and the interior design of the first two MEININGER hotels in France.
33 33 AXELCONTACTSCHOENERT ARCHITECTES 20, avenue de l’Opéra | 75001 Paris Agathe Petit - Head of Communication www.as-architecture.com+33communication@as-architecture.com(0)144553487 Giovanna Carrer - council +33giovanna@gioca.paris(0)663253891
Axel Schoenert www.as-architecture.comarchitectes
