Located in a central Tokyo neighborhood with many low and mid-rise office buildings, this rental building for restaurants stands on a long, narrow lot, surrounded on three sides by streets. Key considerations when designing a building of this type are how to create a group identity for the tenants and how to relate the units to the cityscape. Because of its city-center location, this mid-rise building needed to be commercially efficient, occupying the entire permissible floor area ratio and filling that space with restaurant tenants on every floor. It was therefore essential to create the image of a building full of restaurants, to set up a bright and welcoming environment for visitors, and an attractive building for the passerby.
The new building has a recessed façade with three-dimensional stacked terraces, protruding into this space on each floor. The size and shape of these terraces vary by floor, creating a layered form that changes as it moves upward. Furthermore, this dynamic facade is entirely made of glass, allowing people outside to look into the restaurants. These excrescences are real outside extensions to the restaurants space, and appear to the facing street like a lively theater scene.
▼餐厅建筑拥有内陷的立面形态和立体的户外露台， building has a recessed façade with three-dimensional stacked terraces
▼刻意为之的断层露台给予各层食客一个特别的观景视角，the terraces are connected with a strategically placed yet continuous gap link the terraces with above and below
The sheltered terraces are connected with a strategically placed yet continuous gap link the terraces with above and below, allowing even diners on the higher floors to sense the people and cars passing on the street below and enjoy eating in a dynamic urban atmosphere. In typical multi-story restaurant buildings, tenants are completely independent of one another, but this building, they interact through terraces, creating opportunities for customers at each restaurant to visit the others. Regarding the materiality of the building, the black joinery work and frames, while avoiding an office-like exterior appearance, give to the building an entity, and allow each restaurant unit to stand out clearly from each other. For the interior spaces, the black window sashes, neutral and basic, allows the users to appropriate the space easily.
▼食客可以在断层处展开上下层的对望，the gap allowing diners on the higher floors to sense the people and cars passing on the street below
▼中性装饰营造舒适内部氛围， the black window sashes, neutral and basic, allows the users to appropriate the space easily
In response to its context, the building, alike a porous volume, encourages the terraces on each floor to connect to the street and the larger neighborhood. In doing so, it aims to a new type of public character.
KEY OPERATION INC. / ARCHITECTS
4F Doors Blg, 3-19-10, Takaban, Meguro-ku, Tokyo 152-0004, JAPAN
Phone : +81.(0)3.5724.0061
Fax : +81.(0)3.5724.0062
E-mail : email@example.com
URL : www.keyoperation.com
Architecture : Akira Koyama + KEY OPERATION INC. / ARCHITECTS
Photography : Shigeo Ogawa
Location : Chiyoda-ku, Tokyo, Japan
Date of Completion : September 2017
Principal Use : Restaurant / Store
Structure : Steel Framework + Steel reinforced concrete structure / Pile Foundation
Site Area: 154.91m2
Building Area : 116.66m2
Total Floor Area : 986.03m2
Design Period : July 2015 – July 2016
Construction Period : August 2016 – September 2017
Structural Engineer : Delta Structural Consultants
Service design: Comodo plan
Lighting design: Akira Koyama + KEY OPERATION INC. / ARCHITECTS
Exterior: Aluminum curtain wall + Metal panel
Floor : B1F Troweled in-situ concrete , 1F-9F Composite steel deck concrete slab
Wall : B1F In-situ concrete / 1F-9F Extruded molding cement board
Ceiling : B1F In-situ concrete / 1F-9F Steel deck
Lighting: Panasonic, Koizumi