Tomohiro Hata Lifts a Kobe Pier into an Artificial Hill That Doubles as an Open-Air Theater

Kobe has always been defined by compression: mountains to the north, the Seto Inland Sea to the south, and a narrow urban strip squeezed between them. At the tip of the city's Second Pier, where container ships once moored, Tomohiro Hata Architect and Associates has built something that literalizes that geography. TOTTEI Green Hill is an 11-meter-tall artificial topography, a grassed slope that rises from a waterfront plaza and folds over a glass pavilion containing restaurants, a brewery, and event space. It is simultaneously landscape, building, grandstand, and public park.

The concept is deceptively simple: peel up one edge of a flat plaza as if it were a picnic blanket, and the space underneath becomes architecture. Hata cites the ancient Greek theater at Taormina in Sicily as a reference, and the parallel is legible. Bowl-shaped seating faces the harbor, framing the Rokko mountains and the red arc of a distant bridge as a permanent backdrop. But where a Greek theater carved into a hillside, TOTTEI manufactures one from scratch on a flat pier. That inversion, building up rather than digging in, is what makes the project genuinely unusual.

Manufactured Topography on a Flat Pier

Seen from the air, the gesture is unmistakable. A rectangular lawn tilts upward from grade, its surface striped with metal-grate terraces that double as seating steps. The slope descends toward the water, terminating in a curved lawn at the harbor edge. People drift across it at multiple elevations: walking the upper rim, sitting on the steps, lounging on the grass below. The green surface reads as a continuation of the ground plane rather than a roof, which is precisely the point.

The metal-decked structure supporting the planted slope is visible at the edges, where grating meets air. It gives the hill an honest, engineered quality rather than trying to pass as natural terrain. Kobe's port infrastructure is hard and industrial; Hata does not pretend otherwise. He simply adds a softer layer on top.

The Amphitheater as Public Space

The stepped terraces are the project's most photogenic element, but they also do the heaviest programmatic work. Planted rows alternate with open metal-grate treads, creating a rhythm that invites sitting as much as climbing. A stage area and adjacent event plaza allow the steps to function as a proper amphitheater, while on quieter days the terraces simply offer places to pause and look at the sea.

Standing at the upper walkway and looking down the diagonal roof plane, you grasp the scale. The slope is steep enough to feel like a vantage point but shallow enough that it remains accessible. Railings are minimal, and the planting softens what could otherwise feel like bleachers. The design threads a needle between spectacle architecture and everyday urban furniture.

Glass Pavilion Beneath the Hill

Underneath the tilted landscape sits a glass-fronted pavilion that houses restaurants, a multipurpose hall, and the TOTTEI Brewery, which produces four original craft beers on site. The pavilion reads as a transparent base holding up the green mass above it, an effect that is particularly striking at dusk when interior light glows through the glazing while the planted roof goes dark against the sky.

The triangular facade at the harbor end, with its timber louvres between glazed upper panels and a solid lower register, gives the building its only conventional elevation. Everywhere else, the architecture dissolves into either landscape above or transparency below. The external staircase beside the planted lawn provides a secondary circulation route that keeps the covered terrace beneath free for dining and gathering.

Interior Spaces Shaped by the Slope

Inside, the sloping roof becomes a folded concrete ceiling plane that angles dramatically over a mezzanine level. Timber-clad walls warm the palette and provide acoustic absorption, while the structural steel columns that carry the hill's weight are left exposed. The interior does not try to conceal the fact that you are standing beneath an artificial landform; the angled geometry is constant and legible overhead.

The best moments come along the harbor-facing corridor, where a timber curtain wall frames long views of the water and the distant red bridge. Light enters at a low angle through the glazing, filtered by the slope above, creating a sheltered yet luminous atmosphere. It is a convincing argument for year-round use: the covered spaces below the hill offer refuge from rain and summer heat without severing the visual connection to the port.

Covered Terraces and the Edge Condition

The covered terrace beneath the planted roof structure is perhaps the most generous space in the project. Steel beams span overhead, and timber-framed glass doors open onto the promenade, blurring the boundary between inside and outside. It functions as a shaded extension of the public plaza, usable for markets, casual dining, or simply standing out of the sun.

At the triangular end, the building's section compresses to a knife edge where roof meets ground. The timber louvres here filter western light and give the facade texture at a scale legible from across the harbor. It is a small detail, but it keeps the building from reading as a monolithic wedge. The louvres also signal the presence of habitable space behind what might otherwise look like pure infrastructure.

Plans and Drawings

The site plan makes the urban strategy explicit. TOTTEI sits at the terminus of a linear coastal route that connects the inland city to the waterfront, positioned at the northeast corner of the pier. The floor plans reveal how the angled footprint creates distinct zones: a main hall, tenant restaurant spaces, a warehouse volume, and terraces that wrap the perimeter. The building is compact but loaded with program.

The two sections are the most revealing drawings. They show the planted green roof cascading over terraced levels above a columned base, with the stepped seating descending to meet the water's edge. The relationship between the metal-grate amphitheater and the glass pavilion below is immediately clear: they are a single structural system, not a building with a green roof bolted on top. The slope is the architecture.

Why This Project Matters

Port cities around the world are converting industrial waterfronts into public destinations, and the results are often formulaic: boardwalks, food halls, maybe a Ferris wheel. TOTTEI Green Hill proposes something more specific to its place. Kobe's identity is bound up in the compressed distance between mountain and sea, and Hata's artificial hill collapses that distance into a single walkable surface. You climb from the waterfront plaza to the hilltop in a few dozen steps, and the panorama from the Rokko range to the Seto Inland Sea unfolds as you rise. The project makes the city's geographic condition something you experience with your body, not just your eyes.

As the first public-private partnership in Japan certified by the Ministry of Land, Infrastructure, Transport and Tourism under the Minato Green Space framework, TOTTEI also sets a procedural precedent. The three remaining piers in Kobe's port are slated for similar transformation from container logistics to public life. If the subsequent projects achieve even half the spatial inventiveness of this one, Kobe's waterfront will become one of the more compelling urban edges in Japan. The bar has been set, and it is 11 meters high.

TOTTEI Green Hill by Tomohiro Hata Architect and Associates, Kobe, Japan. Completed 2025. Photography by Toshiyuki Yano.

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