Superimpose Architecture Splits a Hangzhou Transit Hub into Valley and Cloud

Transit-oriented development tends to produce architecture that treats arrival as a logistical problem. You funnel commuters from the platform to the street, stack commercial square meters on top, and move on. Sky City TOD in Hangzhou's Yuhang District, completed in 2022 by Superimpose Architecture, takes the opposite approach: arrival here is a spatial event, organized around a landscape that pulls daylight, green, and water down into the podium levels where subway riders first surface.

The design concept is legible in two registers. The lower levels, which the architects call "The Valley," are terraced, planted, and scaled to the pedestrian. The upper levels, dubbed "The Cloud," retreat into a calmer rhythm of vertical aluminum fins. Between them, a glass box splits the tower massing, carving out two special tenant floors that can serve as showrooms or open-plan event spaces. It is a simple organizational idea, but executed with enough material conviction to hold 72,000 square meters together without feeling like a single slab extruded from a transit diagram.

The Valley: Ground-Level Landscape as Infrastructure

Where most mixed-use podiums present a continuous retail frontage, Sky City opens up. Paved walkways thread through planted beds and young trees, creating a ground plane that feels more like a park with buildings in it than a commercial plinth. The integration of a government-owned green belt into the design was not incidental; it became the organizing principle for pedestrian circulation between the subway station and the offices above.

Voids cut into the landscape pull natural light into basement levels, turning what would normally be dead service floors into habitable space. It is a straightforward passive strategy, but one that most developers skip because it sacrifices leasable area at grade. That Vanke Hangzhou and the Hangzhou Subway Group agreed to it says something about the project's ambitions beyond square-meter yield.

Ascending Through Terraces

The transition from subway to street to office is choreographed through outdoor stairs, escalators, and planted terraces that shift level by level. Shifting slabs provide canopies for the levels below while generating terraces for the levels above, so every horizontal surface does double duty. At twilight, the terraces come alive with uplighting beneath established trees, giving the complex an evening presence that reads as landscape rather than signage.

Entry pavilions with stone walls and glass enclosures mark thresholds without imposing gates. The effect is welcoming rather than monumental, a quality that serves a development located in Hangzhou's tech corridor, steps from the campuses of Alibaba and Tencent, where workers expect permeability over ceremony.

The Cloud: Tower Massing and Facade Logic

Above the Valley, the two office towers adopt a deliberately restrained facade language. Vertical aluminum fins, both perforated and solid, march in tight repetition across the upper volumes. The perforated panels conceal operable ventilation openings, allowing the facade to breathe without punching visible holes in its surface. It is a clean resolution: the building looks serene from the street while performing real environmental work.

The most dramatic moment occurs where the tower mass is split by a cantilevered glass box. Flanked above and below by the louver screens, this interruption reads as a geological fault line, a sectional break that reveals the interior life of the building. These two special floors offer flexible tenant space, whether for corporate showrooms or open-plan work environments, and they give the skyline silhouette an identifiable notch.

Facade Layering and Material Palette

The facade is not one system but several, stacked and interlocked. Lower bands use horizontal glass and concrete fenestration that relates to the podium's human scale. Upper bands switch to vertical aluminum fins that elongate the towers visually. Between these registers, the glass-box insertion provides a moment of total transparency. The material palette stays narrow: aluminum, glass, concrete. No cladding gymnastics, no gratuitous color. The discipline pays off in coherence across a building that spans very different programmatic zones.

Interior Character

Inside, the lobbies and common areas sustain the exterior's material restraint. Timber slat ceilings warm the main lobby, set against polished stone floors and white marble reception desks. A lounge area with terrazzo flooring and suspended circular fixtures reads as a co-working space rather than a corporate foyer. These are not afterthought interiors; they carry forward the idea that a transit-connected building should feel inviting from the moment you step off the escalator.

Covered walkways with ribbed ceilings and pixelated tile walls extend the architectural language into circulation zones that would typically be left raw. It is a small detail, but it signals that the architects were thinking about the full pedestrian experience, not just the leasable area behind the glass doors.

Courtyards and Canopy

An interior courtyard framed by glass curtain walls and white metal panels creates a sheltered outdoor room at the heart of the complex. Overhead drone views reveal a timber pavilion structure nested within dense tree canopy, suggesting that the landscape plan was designed for maturity, not just for opening-day photography. The trees are young now, but the spatial framework is generous enough that the courtyard will improve over time.

Aerial Context: Yuhang District and the Uni-City Masterplan

Pulled back to aerial scale, Sky City sits within SOM's one-square-kilometer Uni-City masterplan, a 155,000-square-meter district that includes residential blocks, tree-lined boulevards, and a river edge. The striped facade towers are immediately legible against the surrounding residential grain. Superimpose's contribution occupies a strategic position: it is the transit gateway to the entire district, the first thing residents and workers encounter when they surface from the subway.

The LEED V4.1 Platinum precertification for communities at the plan-and-design stage is worth noting, not because certifications alone prove sustainability, but because it indicates that the passive strategies embedded in the design, from perforated ventilation fins to daylight voids, were part of a coordinated environmental framework rather than individual gestures.

Plans and Drawings

The site plan reveals how the tower and linear bar buildings organize around landscape and circulation paths, with the green belt woven through rather than pushed to the perimeter. Ground and upper floor plans show the tower lobby transitioning into an elongated bar with repeating room modules, an efficient layout that keeps cores compact and daylight access high. The detail sections of skylight assemblies, bracket connections, and window-to-slab junctions demonstrate a level of facade engineering that matches the project's visual ambition. Angled bracket connections and insulated roof hatch assemblies point to a team that worked through the details, not just the renders.

Why This Project Matters

TOD projects in Chinese tech corridors are built at enormous speed, and most of them look like it. Sky City TOD stands out not for formal novelty but for the seriousness with which it treats the ground plane. The Valley-and-Cloud concept is, at its core, a sectional argument: give the public realm the landscape richness it needs at the bottom, and let the commercial program recede into disciplined repetition above. That argument is made convincingly here, in part because the facade systems, the landscape strategy, and the interior detailing all reinforce the same idea.

For architects working on transit-adjacent mixed-use, Sky City offers a replicable lesson. You do not have to treat the subway exit as a service door. You can make the threshold between transit and city the most generous space in the entire project. Superimpose Architecture, working with clients willing to sacrifice some ground-floor leasable area for daylight voids and green belts, has produced a complex that will age well precisely because it was designed for the pedestrian first and the investor second.

Sky City TOD, designed by Superimpose Architecture. Located in Yuhang District, Hangzhou, China. 72,000 m². Completed 2022. Photography by CreatAR Images.

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