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The “world’s tallest modular building” in this title is J57 in Hunan, China, as described by Architecture & Design in 2017. That article presented SkyCity Challenge 17, a collaborative design competition involving more than 100 global citizens, and asked participants to imagine a shared “vertical street” inside the tower. A vertical courtyard is therefore best understood as a social and spatial idea for a very tall modular building—not as a documented, completed garden with measured results.
The 2017 article reported J57 at 200 metres and 57 floors, built in 19 days. Those figures belong to that report; they are not independently verified measurements or a verified construction schedule here. The design task is still useful because it exposes the central problem of modular high-rise architecture: how can a building assembled from repeated units create memorable, welcoming communal space without breaking the structural, service and installation systems that make modular construction possible?
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What the title refers to
SkyCity Challenge 17 was framed as a collaborative design exercise around J57, a modular tower in Hunan, China. Architecture & Design’s 2017 report described the project as a 200-metre, 57-floor building and said it was built in 19 days. The same report identified an internal “vertical street” as the distinctive design hook. It did not establish a completed courtyard scheme, a winning planting plan, post-occupancy results or independently measured environmental performance.
That distinction matters. “World’s tallest” is historical wording from the article, not a current, settled record. More recent descriptions of another project, College Road/Enclave in Croydon, give conflicting height and completion/status details, so no present-day tallest-modular-building ranking can be stated reliably from the available evidence.
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Why put a courtyard inside a modular tower?
A conventional courtyard spreads shared life around a horizontal open space. In a tower, the same social function has to be distributed vertically. The proposed courtyard can be a sequence of linked rooms, landings and overlooks rather than one enormous void. It can give residents reasons to pause, see other floors and choose a route that is more generous than a corridor.
Movement rather than a decorative atrium
Calling the space a “vertical street” sets a clear expectation: it should support movement and encounters. Bridges, stairs, lifts and widened landings can form a legible route through the building. A successful concept would distinguish through-movement from places where people can sit, wait, talk or work, so that circulation does not consume every usable square metre.
Outlook and orientation
Repeated modules can make a high-rise feel interchangeable from floor to floor. Carefully placed openings, changes in ceiling height and framed views can provide orientation. The design question is not simply how much void to remove, but where a person should look, what they should see from a landing and how the route reveals the next shared space.
Shared use without invented outcomes
Possible uses include informal seating, small community events, play areas or quiet work tables. These are design options, not documented outcomes of J57. The available account does not report how occupants used a courtyard, whether planting was installed or whether any proposed arrangement was built.
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Modular construction sets the boundaries
A courtyard proposal has to fit a coordinated system of modules, a concrete core, connections, services and construction sequence. Michael Hough, founder of MJH Structural Engineers, explained the structural relationship in a 26 September 2022 Modular Building Institute interview: “The modules are all interconnected and all the horizontal loads on the building are transferred through the modules and supported by the concrete core.” His statement is general technical context, not project-specific approval for J57.
Core and module connections
The concrete core commonly accommodates major vertical circulation and helps resist horizontal actions, while the modules connect to one another and to the core. A large uninterrupted courtyard opening could remove modules that contribute to the building’s load path. The concept therefore needs an early structural study showing where modules can be omitted, stacked, transferred or replaced by a deliberately designed frame.
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Services and fire separation
Every shared floor needs coordinated routes for ventilation, drainage, electrical distribution, sprinklers, lighting and communications. A planted or wet feature adds irrigation, drainage and maintenance access. Openings between levels also affect smoke control, compartmentation and evacuation planning. The architectural sketch should reserve shafts, risers, inspection points and fire-rated boundaries before furniture or planting is selected.
Installation and access
Factory-built units arrive in a planned order and are lifted, connected and commissioned on site. A courtyard element that cannot pass through the available access route may require assembly in place, temporary works or a different sequence. Hough’s interview stresses the importance of connection access and building-information-modelling coordination; those are process requirements to resolve with the project team, not proof that any particular J57 detail was accepted.
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Four courtyard concepts to test
The following concepts are design directions for the competition brief. None is presented as a measured J57 proposal or as an installed system.
| Concept | Spatial character | Primary benefit to test | Main coordination question |
|---|---|---|---|
| Stacked neighbourhoods | Several compact garden rooms at selected levels, linked by visible stairs and bridges. | Creates recognisable destinations without one continuous void. | Which modules can be removed or altered at each “neighbourhood” floor while preserving a clear load path? |
| Terraced vertical street | A rising route with alternating balconies, seating pockets and framed views. | Makes movement itself the social experience. | How do stairs, accessible lifts, handrails, smoke control and acoustic separation work together? |
| Winter-garden spine | A series of enclosed, daylit communal rooms beside the main circulation route. | Offers weather-protected gathering space and a strong visual address. | Can the envelope, ventilation, solar control and irrigation be maintained at every level? |
| Quiet-to-active gradient | Active gathering floors near shared facilities, quieter planted rooms above or below. | Accommodates different noise and privacy preferences. | How are uses assigned, managed and serviced without making the route confusing? |
Daylight, planting and maintenance
A vertical courtyard should begin with a daylight study, not a plant catalogue. The architect can map direct sun, diffuse light, glare and shadow at each proposed opening and test how neighbouring towers or the building’s own structure affect conditions. The available material contains no daylight measurements for J57, so any claim about a species list or year-round growth would be speculative.
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Use planting where people can care for it
Planting works best where staff can reach irrigation valves, inspect drainage, replace failed specimens and remove growing media safely. Smaller planted rooms may be more maintainable than a single dramatic green wall spread across dozens of storeys. The proposal should show soil depth, overflow routes, waterproofing, root barriers, lighting and access equipment as part of the architecture.
Separate visual greenery from ecological claims
Leaves and planters can soften a hard circulation space, but they do not automatically establish biodiversity, air-quality improvement or energy savings. Those outcomes require a defined planting system, operating data and a maintenance regime. SkyCity Challenge 17’s reported material does not provide such evidence.
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Circulation, access and safety questions
The “street” metaphor should not obscure basic access. A concept review should answer these questions:
- Is there a step-free route between every shared level, with lifts sized for expected traffic and emergency use?
- Are stairs visible and attractive enough to encourage use while remaining protected and code-compliant?
- Can a person who does not want to socialize bypass the busiest areas?
- Do bridges and overlooks have appropriate edge protection, lighting and sightlines?
- How are smoke, fire doors, evacuation routes and refuge provisions handled around the open spaces?
- Can cleaning teams, gardeners and replacement materials reach every surface without entering residents’ private areas?
These questions define the courtyard as infrastructure as well as scenery. Exact dimensions, fire ratings and occupancy limits would have to come from the project’s jurisdiction, code consultant and structural engineer; they are not supplied for J57.
Fit the idea to a module grid
Start by drawing the repetitive module bay and marking the non-negotiable zones: core, stairs, lifts, service risers, wet rooms and connection points. Place social rooms where the grid can accept them repeatedly, then identify the few locations where a special transfer or long-span element is justified. Repetition lowers fabrication complexity; a small number of deliberate exceptions can create identity without turning every floor into a bespoke assembly.
Building-information modelling can coordinate the architectural, structural and service models before fabrication. It should be used to check tolerances, connection access, maintenance clearances, temporary supports and the order in which modules and courtyard components arrive. A persuasive competition submission would show these relationships in sections and exploded diagrams, not only in a perspective rendering.
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How the London precedent differs
Ten Degrees, also known as 101 George Street, is a separate modular residential project in Croydon. A Modular Building Institute profile records two connected towers, 38 and 44 storeys, rising to 136 metres and containing 546 apartments. Its profile describes external top-floor amenity spaces; it does not describe a J57-style internal vertical street. The project is useful as a comparison of scale and modular delivery, but it is not evidence that J57’s courtyard concept was built or validated.
A practical workflow for developing the courtyard
- Define the social brief. List who uses the space, at what times and for which activities. Separate through-routes, short stays, organised events and quiet retreat.
- Map the existing system. Draw the module dimensions, core, structural connections, risers, lifts, stairs and façade zones before placing a courtyard.
- Choose a vertical rhythm. Decide whether the shared rooms repeat every few floors, form a continuous route or alternate between active and quiet levels.
- Test section and access. Draw stairs, step-free routes, overlooks, fire boundaries, smoke-control zones and maintenance paths in a coordinated section.
- Model daylight and climate. Evaluate sun, glare, wind exposure, rain entry, ventilation and thermal comfort for each communal room. Label assumptions where project data is unavailable.
- Design the maintenance system. Specify drainage, irrigation, waterproofing, replacement access, cleaning equipment and safe working routes before selecting planting or finishes.
- Coordinate fabrication. Check every special component against lifting, transport, connection access, tolerances and the installation sequence.
- Invite review. Ask structural, fire, services, accessibility and operations specialists to challenge the concept before presenting it as feasible.
What is established—and what remains unknown
Established by the 2017 Architecture & Design account are the competition name, its participation by more than 100 global citizens, the J57 location and description, the reported 200-metre height, 57 floors, 19-day construction claim and the internal “vertical street” motif. The figures should be read as that article’s reporting.
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1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitchesNot established in the available material are a named winning courtyard design, built planting, measured daylight or energy performance, occupant satisfaction, maintenance costs, or a verified current world record. The College Road/Enclave descriptions disagree on height and status, which is why a present-tense ranking would overstate the evidence.
Conclusion: design the street first, then the garden
J57’s enduring design question is how a modular tower can produce shared urban life from repeated units. Treat the vertical courtyard as a connected public realm: a route with pauses, views, daylight, access and maintenance, all negotiated with the core, module connections and service network. Planting can reinforce that experience, but it cannot substitute for a workable structure, safe circulation or an operating plan. That is the useful lesson of SkyCity Challenge 17, even though the available record does not document a completed courtyard or prove that J57 remains the world’s tallest modular building.
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