ZIAD Twists Two Glass Office Slabs Around a Garden Atrium for Tiansong Headquarters in Wenling

Corporate headquarters in fast-growing Chinese cities usually do one of two things: they shout, or they disappear behind a podium of retail. Tiansong Headquarters, completed in 2025 by the Zhejiang Institute of Architectural Design (ZIAD) in Chengxi Subdistrict, Wenling, tries a third route. The 31,270 m² building sits on a corner where the old town of Taizhou's coastal county-level city meets its newer urban district, and the brief it answers is unusual for a developer's office: be a landmark, but a restrained one.

What makes the project worth your attention is how it gets there. ZIAD splits the programme into two slab-shaped office volumes, aligns each one with a different city axis, and lets them twist, step and swell until they enclose a transparent atrium between them. The client, Tiansong Construction Group, also served as the engineering contractor, so the building works as a calling card for the company's own idea of precision. We think the move that counts is not the glass skin. It is the decision to hand a large share of the ground plane back to the street.

Reading a Fractured Intersection

The aerials explain the problem better than any diagram. Low-rise housing, canal-side blocks and wide arterial roads crowd around the site with little shared logic, and the city grid shifts direction right here. Rather than picking one orientation and ignoring the other, the two slabs each lock onto one of the competing axes. The result reads less as an object dropped on a lot and more as a hinge between two urban patterns.

Seen from the empty intersection at low sun, the stepped profile does real work. The building rises in terraces instead of a sheer wall, so its height arrives gradually from the street. The planted rooftops visible from above suggest the stepping is more than a silhouette trick; each setback becomes usable outdoor space for the floors behind it.

Two Slabs, One Twist

Walk around the building and the massing keeps changing. From one corner it reads as a single tapering tower; from the street it breaks into stepped volumes of different heights. The worm's-eye views show where the two slabs meet at an angle, and that meeting is the most legible expression of the concept: two directions held together, not fused.

The expansion and contraction of the volumes keeps a building of this size from feeling monolithic. You never see the full bulk at once. Some will read this as a familiar parametric gesture, but here the twist has a reason grounded in the street pattern rather than in a render's appetite for drama.

A Curtain Wall Tuned with Bronze Fins

The envelope is a gridded glass curtain wall articulated with dark, bronze-toned vertical fins and mullions. Up close the fins add depth and a measurable rhythm; from a distance they turn the glass from mirror into texture. In warm evening light the upper floors pick up pink clouds and the neighbouring blocks, which softens the towers against a busy skyline.

This is where the client's emphasis on craftsmanship becomes visible. A curtain wall with this many setbacks, corners and planter edges leaves little room for sloppy junctions, and the photographs show a disciplined grid carried over every change in plane. The restraint is deliberate: the material palette stays narrow so that the massing can carry the expression.

A Plaza Given to the City

The main entrance faces the arterial road and comes paired with a public plaza open to residents, not just staff. Linear paving stripes, young trees, a reflecting pool and a timber-framed pavilion turn the forecourt into a place to cross or linger rather than a ceremonial drop-off. Landscape design by Hangzhou Jiumu Landscape Design keeps the surface open and legible, with planting pushed to the edges.

In a neighbourhood that lacks coherent public space, this ground floor generosity is the building's most civic gesture. The timber canopy at the entrance warms the glass above it and signals, at human scale, where the private building begins.

The Atrium as a Vertical Garden Room

Between the slabs, the transparent atrium is the project's emotional centre. At dusk it glows amber over a timber-decked plaza, with a circular opening cut overhead. Inside, a timber-clad wall, a round skylight window and an angled column sit beneath the glass roof. The geometry of the two twisting slabs shows up most clearly here, where their meeting becomes an occupiable void.

At its base the atrium becomes a courtyard of banded stone walls, a stepped stair, a rock garden and pines under bronze-clad overhangs, with a round pool, boulders and a floating stair hung on steel rods in the entrance court. The references to the Jiangnan garden are clear without being literal. Interiors by Huanyi Space Design (Hangzhou) carry the timber into the office floors, where wood flooring and clad columns run beside full-height glass and keep the workspace from feeling like a generic corporate box.

Plans and Drawings

The site analysis maps the surrounding parks, river, schools and hospitals and the setback lines that constrained the footprint. The massing diagrams show the core argument in its simplest form: two slabs flanking a central void, with the approach from the arterial road driving the opening. The functional axonometric stacks a commercial base, open office floors and a canteen band, while the elevation reveals how the fins pace the facade around a recessed central bay. The final site plan makes the angled footprint plain against the orthogonal apartment blocks around it.

Why This Project Matters

Tiansong Headquarters shows that a corporate tower in a mid-sized Chinese city can mediate its context instead of overpowering it. By aligning two volumes with two city axes, ZIAD turns a planning awkwardness into the building's organising idea, and the stepped, planted massing lets a 31,270 m² programme sit among low-rise neighbours without a sheer wall of glass.

The broader lesson concerns the ground floor. The public plaza and the garden atrium give the city something back for the height it receives, and the client's dual role as owner and contractor gives the details an unusually direct line to execution. Whether the plaza stays truly public over time will be the real test. As built, it sets a sensible benchmark for how developer headquarters across Zhejiang might behave.

Tiansong Headquarters by Zhejiang Institute of Architectural Design (ZIAD), Wenling, Taizhou, China. Area: 31,270 m². Completed: 2025. Photography by Wenpei.

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