“叠石”飘窗，连接城市的租赁办公楼 / 三菱地所设计

编译：王子萱 | 校对：王子萱 | 2025.11.21 18:42

项目名称 Front Place Chiyoda Ichibancho

设计单位 三菱地所设计 Mitsubishi Jisho Design Inc.

项目地点 日本东京

建成时间 2024年

建筑面积 6862.78平方米

本文英文原文由Mitsubishi Jisho Design提供，由有方编译。

这座租赁办公楼位于东京都千代田区一番町，距地铁站仅数步之遥，周边环绕皇居（旧江户城）一带，历史与文化底蕴深厚。传统的租赁办公楼通常在一栋楼内容纳多家公司，但在立面上无法呈现其内部的多样性，除此之外，也缺乏与周边社区的联系，对街景和邻里氛围的贡献有限。

This tenant office building stands just steps from a subway station in the Ichibancho district of Tokyo’s Chiyoda Ward—an area near the Imperial Palace (the former Edo Castle) steeped in history and culture. Conventional tenant office buildings generally house multiple companies within a single structure, yet their facades fail to reflect the diversity within. On top of this, they lack a sense of connection with the surrounding community and contribute little to the streetscape or the character of the local neighborhood.

本项目通过打造一座既能连接人与城市环境、又能容纳愈发多样的工作方式与价值观的建筑，有效回应这些问题。为此，设计纳入了两大关键元素：以凸出的飘窗构成的室内空间，以及开放的室外空间。

This project addresses these problems by creating a building that connects people to the surrounding urban environment while accommodating increasingly diverse work styles and values. To achieve this, two key architectural elements were incorporated: interior spaces defined by projecting bay windows and an open exterior space.

建筑立面采用层层堆叠、形状各异的飘窗设计，其灵感来源于周边旧城护城河旁仍可见的石墙——将“叠石”作为主题意象。飘窗展现了各入驻企业与员工的多样活动，为周边街景带来活力，也增强了使用者与工作场所之间的联系。立面复杂的外观由标准铝窗框与四种不同U形的预制混凝土板组合而成，在表达力与经济性之间取得平衡。

The design for the facade, composed of bay windows of varying shapes stacked floor by floor, is based on the concept of piled stones—a theme inspired by the stone walls still visible along the old castle moat in the vicinity. The bay windows give expression to the diverse activities of the tenant companies and their employees, enlivening the surrounding streetscape and nurturing a sense of connection between the occupants and their workplace. The exterior’s complex appearance was achieved through a combination of standard aluminum window frames and precast concrete (PC) slabs in four different U-shaped configurations, balancing expressive design with economic efficiency.

每一层的飘窗空间与建筑立面都融为一体，并通过不同高度形成吧台或办公桌等多样尺度的使用场景。在建筑法规的豁免条件下，这些空间不计入建筑面积，从而在既定体量内有效增加可用空间，从而形成经济优势。同时，设计重新激活了窗边区域，也即标准办公布局中常被闲置的空间，使其成为新的活动空间。整体布局以飘窗为核心，鼓励灵活的办公方式与自由的家具布置。

The spaces created by the bay windows on each office floor are integrated with the facade and vary in height, accommodating counter- to desk-level seating. Under building code exemptions, these spaces are excluded from floor area calculations, effectively adding usable workspace within the allotted building volume and creating an economic advantage. At the same time, the design redefines the window perimeter—an often underused zone in standard office layouts—as an area of activity. The result is an office building that encourages flexible working styles and imaginative furniture arrangements, with the bay windows as the centerpiece.

利用场地的坡度，设计团队在入口处设置了结合台阶与露台的空间，将街道的标高变化纳入设计。底层咖啡馆面向入口一侧可完全打开，当窗框收起时，街道、办公入口与咖啡馆在架空空间内自然连通，形成开放友好的外部空间，欢迎周边居民、办公人员及访客停留。

Taking advantage of the sloping terrain, we incorporated benches and terraces at the entrance that utilize the difference in elevation from the surrounding streets. The ground-floor café can be fully opened in the direction of the approach; when the window frames are retracted, the street, office entrance, and café connect seamlessly through the piloti space, creating an inviting exterior that welcomes local residents, office workers, and café visitors alike.

此外，所有办公楼层均采用空气式辐射冷却系统，并设置可开启窗户以实现自然通风。DALI（数字可寻址照明接口）照明控制系统也在租户装修阶段减少环境负担。通过这些措施，建筑年一次能源消耗较基准降低超过40%，BEI达到0.58，相当于BELS五星与ZEB Oriented的性能水平。

In addition, all office floors are equipped with an air-based radiant cooling system and operable windows for natural ventilation. The use of a DALI (Digital Addressable Lighting Interface) lighting control system also reduces the environmental impact of tenant fit-outs. Through these measures, the building achieves a reduction of more than 40 percent in annual primary energy consumption compared to standard benchmarks, corresponding to a BEI of 0.58—equivalent to BELS 5-star and ZEB Oriented performance levels.

公共区域则引入WELL的理念——例如不同楼层的颜色策略、鼓励使用楼梯的导视设计，以及在建筑中多处融入“叠石”主题。由此，该项目成为日本首座获得WELL Core v2预认证的租赁办公楼。

In the common areas, WELL concepts were incorporated through strategies such as distinct color schemes on each floor, signage that facilitates and encourages stair use, and the application of the “piled stones” motif throughout the building. As a result, the project became the first tenant office building in Japan to obtain WELL Core v2 pre-certification.

该建筑的租户不仅包括长期扎根当地的企业，也吸引了外资公司、数字创意企业、珠宝品牌等，这些租户注重设计、WELL原则与环境表现。该项目为周边城市社区带来一个连接多元产业与专业的新节点，呈现出中型租赁办公楼未来发展的可能性。

The building’s tenants include not only businesses that have long called the area home but also foreign-affiliated firms, digital creative companies, jewelry brands, and others—tenants that place strong emphasis on design, WELL principles, and environmental performance. The project has given rise to a new hub for connecting diverse industries and professions within this urban neighborhood—a model for the future of mid-scale tenant office buildings.