The new Hauts-de-Seine Departmental Administrative Center consolidates all State services within a single building. PCA-STREAM leads a major transformation that combines functional reorganization with the rehabilitation of an existing modernist structure. The project rationalizes circulation flows, clarifies access hierarchies, and groups entities by function to enhance legibility and efficiency. Office floors are redesigned as bright, flexible, and cross-ventilated workspaces aligned with contemporary working practices. Respecting the architectural language of the original building, the intervention upgrades thermal comfort and energy performance while introducing carefully calibrated daylight. The result is a coherent, efficient, and enduring civic infrastructure : a renewed framework for public service at the heart of Nanterre.
At the heart of La Défense’s historic plaza, the Maison de La Défense emerges as the new public space of the district. Designed by PCA-STREAM for Paris La Défense, it embodies the shift from a modernist business hub toward a more open, inclusive, and inhabited metropolitan landscape. Conceived as an urban demonstrator, the Maison de La Défense unites architecture, landscape, and uses within a systemic approach. This 1,000-square-meter pavilion hosts exhibition, mediation, and gathering spaces designed to tell the story of the territory’s evolution and foster collective ownership of its future. Its architecture—both rational and sensitive—draws inspiration from lightweight, reversible structures. Fully demountable, it embodies principles of circular economy and constructive sobriety. With its timber-glass materiality and landscaped integration, the pavilion creates a moment of breathing within the mineral expanse of the plaza, acting as a hinge between the multiple temporalities of the site’s transformation. As both signal and test space, the Maison de La Défense anticipates the new ambition of Paris La Défense: transforming this emblematic business district into a laboratory for a sustainable and desirable city.
With Porta Romana project, PCA-STREAM design a new destination and landmark for Milan. At the threshold of Scalo di Porta Romana, what was once an urban limit will become an environment of opportunities. PCA-STREAM as the ambition to bring an iconic presence to the area, to offer a new physical and symbolic gateway to the Scalo zone. Around the two monumental staircases, three buildings will flourish with commercial, tertiary, and leisure programming thanks to strong public spaces with nature at the heart of the urban program. Porta Romana exemplify the idea that a buildings’ quality of life, through their planted exteriors, but also the intensity of the urban life of the neighborhood, have become a key factor in their attractiveness.
Nestled in the heart of the Bièvre Valley, the HEC campus embodies the living archive of modern tensions between nature and knowledge, heritage and forward-thinking. In a world undergoing transition, the school chooses to revisit this exceptional environment and integrate it into a sustainable, inclusive, and ambitious strategy. PCA-STREAM proposes a project that is both contextual and transformative: restoring coherence to a fragmented domain, reactivating landscape and social continuities, and creating a new embodied centrality : the Campus Heart, to give form to the HEC of the 21st century. A place of learning in and with the landscape. A campus aligned with its time.
Mouchotte's project reinvents a landmark modernist complex in Montparnasse to meet the challenges of the 21st century. Its sober and responsible rehabilitation prioritizes reuse and performance while clarifying spaces, reprogramming uses, and enhancing outdoor areas. This transformation aims to restore coherence and appeal to the building, contributing to the renewal of the neighborhood.
At the crossroads of three nations, the EuroAirport Basel-Mulhouse-Freiburg embarks on a new phase of transformation. In a uniquely binational context, the extension project led by PCA-STREAM is part of a vision for the terminal’s modular evolution, with a threefold ambition: to enhance the passenger experience, strengthen infrastructure performance, and embody a new sustainable airport standard at the European scale.
The project consists in the rehabilitation of 9 rue de Vienne, a modernist building by Abro Kandjian, reanchoring it in the present while celebrating its architectural heritage. The transformation strengthens the intensity of uses, introduces new services (restaurant, café, fitness, business center, landscaped rooftop), and enhances the flexibility of the floorplates to support evolving work practices. Driven by a responsible and future-ready approach, the project maximizes the preservation of the existing structure, optimizes circulation, and deploys high-performance systems to meet ambitious environmental objectives.
The Sainte-Apolline site in Plaisir, the emblematic headquarters of JCDecaux, is undergoing a transformation. The interior architecture division is designing the common areas, the village square, and the reception, creating flexible spaces that foster collective intelligence. An interior architecture project dedicated to the well-being of its users.
In the heart of Les Batignolles, PCA-STREAM is restructuring a former parking lot into a mixed-use complex of hotels, restaurants and offices. Based on the atypical and industrial dimension of the existing building, but also on the cultural and artisanal heritage of the neighborhood, the agency has chosen to infuse it with a spirit that emphasizes innovation and creativity. An emblematic central space physically and symbolically articulates the programs by offering cultural and event-based activities.
The historic Berenberg Bank building is about to be reborn. Through a contemporary reinterpretation that enhances its architectural legacy, the project breathes new life into a Hamburg icon, transforming its base into vibrant, open, and multifunctional spaces.
The renovation of this emblematic building in Nantes, the Tour Bretagne, is an opportunity to transform an obsolete symbol of the Trente Glorieuse era by adapting it to the contemporary challenges. PCA-STREAM and MAGNUM reinforce its elegance and slenderness by adding a mixed-use housing program, becoming the precursor of a new era for the city and metropolis.