One

This project marks the birth of a resolutely connected and hybrid building, designed to respond to contemporary evolutions in the business world, both spatially and temporally. Located at 48-56 rue Camille Desmoulins in Issy-les-Moulineaux, ONE was born from the conversion of a building constructed in 1992, originally designed by Anthony Bechu.
The building underwent a complete restructuring after 30 years of use, also marking the culmination of the metamorphosis of the Val de Seine business district. Long dominated by industry when it once housed the factories and workshops of the Thomson group, this district has gradually changed its face.
The initial project, which was the headquarters of Galec (E.Leclerc Purchasing Group), had been designed as a "cocoon" closed in on itself, to protect users from an inhospitable and polluted environment. Completely hermetic to the city, this complex was nevertheless organized around large patios and large interior courtyards. A single entrance, with a large portico on the diagonal of the plot leading to the center of the parcel, provided access to 4 staircases leading to the upper floors, as well as to the elevator and another staircase serving the parking lot.

The creation of the ZAC du front de Seine and the gradual departure of industry allowed major company headquarters to establish themselves. In line with this logic, and with the desire to reopen to the now pacified city, the project concept ensures the rebirth of this building through the "Smart Ways to Work" concept, affirmed and carried as a manifesto throughout the project. The ground footprint for offices was 5,709 m², or 69% of the total footprint. The current footprint is now 7,587 m² divided into 4,120 m² for offices, or 50%, and 3,467 m² for retail, or 42%. The increase in ground footprint serves the use of retail and services. The modified PLU and the extended commercial axis of rue Camille Desmoulins allowed the evolution of the building's initial composition grid, which was based on the diagonals of the plot, thus generating hollow teeth in setbacks along the four public roads.
The ONE project eliminated these breaks by adding built volumes, affirming the urban character of a building aligned with public roads.
The building is also densified by the extension of level 7 and raised by the creation of a partial level 8 to the west of the plot.
The ground floor is transformed to accommodate the two interior courtyards, and the whole is covered by glass roofs sheltering a base of services intended for occupants and local residents. This project is emblematic due to its size and positioning.

Facing the brand new RER C exit of the Issy-Val de Seine station stands the welcoming facade of wood and glass. The new building bears little resemblance to what it once was, with only its underground parking preserved. Raised by a seventh and eighth floor, the building totals an extension of 12,000 m². Conceived as early as 2015, the concepts of "openness to the city, integrated diversity, hybridization, and flexibility of uses" anticipated the issues related to the health crisis. Thus open to the city, the ground floor houses a gourmet hall operated by Mamie Cocotte and open to all 7 days a week, as well as shops and meeting spaces (coworking, lounges, cafeteria, concierge services,...).
On the upper floors, the plateaus of over 5,000 m² were designed to be divisible into 4 technically and functionally independent lots, to accommodate multiple tenants simultaneously. Indoor air treatment is done by individual comfort units installed on the facade, offering optimized heights and great modularity. Work spaces and meeting rooms are thus very flexible and easily reconfigurable. Ultra-connected, the building offers a concentration of technologies over 42,000 m²: Wi-Fi and 5G compatible coverage, productive maintenance, and cyber-security of the premises. At Canal +'s request, four of the seven initially planned shops were transformed into recording studios, and the Living Square, a public square at the heart of the site, is ultimately privatized but partially, as the gourmet hall on the RER side remains open to all. However, the building is designed to be able to return to its initial configuration at any time.

Aliénor Bechu, director of the interior architecture and design studio Volume ABC, revisited the interiors through a biophilic concept in harmony and dialogue with nature. Luminous work atmosphere, large open-plan floors, company restaurant on the first floor, accessible regardless of the mode of transport, ONE has been designed for optimal user comfort.
On each floor, the terraces are planted with trees carefully chosen by the landscape architect Neveux-Rouyer. The "Living Square" space is generously planted and conceived as a set of gardens to contemplate, made of contrasts and alternating blooms, whose amenity value does not neglect ecological interest, as more than 80% of the plants are melliferous. In continuity with the need for greening spaces to provide well-being and social connections, nearly 2,100 m² of terrace surface are thus vegetated and accessible to employees, highlighting biophilia.

In terms of interior architecture, the codes of hospitality and housing have been adopted. Thus, the building is no longer just an office building, it becomes a micro-city. The ground floor and first floor are categorized as ERP (establishment receiving the public). The same applies to the gym, restaurant, gourmet hall, bar...

This landscaping project consisting of garden terraces is installed on the building's roof. The created roof surfaces represent 1,790 m² including glass roofs. In total, 2,222 m² of green roof surface have been realized, corresponding to more than 100% of the created roofs. These roofs also promote water retention on the plot by slowing down the path of runoff water.
The play of terraces on the interior as an extension of the glass roofs, and on the balconies and terraces overlooking the city, thus allow trees and nature to come with biodiversity to resettle on these crowns which invite everyone to go out and enjoy this green enrichment, and this exchange with the city and landscape.