Which 总部大楼位于伦敦卡姆登区(Borough of Camden)，著名的摄政公园(Regent’s Park)位于基地西北方向，建筑西临佩托广场（Peto Place），广场另一侧为一排二级保护建筑 - John Nash terraces。
原有的 Which 总部办公大楼是由各具特质的两部分糅合而成：被列为二级保护建筑的Georgian terrace以及20世纪80年代的混凝土结构办公楼。KPF受到 Which 公司的委托与室内设计顾问HLW一同将其重塑改造成为满足现代慈善及商业需求的新办公场所。
改造前
改造后
改造设计面临着一系列的挑战
解决原有问题
满足现有需求
适应未来场所需求的灵活性设计
融入历史街区的同时营造出现代感
改善连通性
上世纪80年代设计的混凝土核心筒占据了建筑两部分的衔接处，不仅在空间上割裂了两部分，也阻碍了人流。最新的设计将核心筒移至近佩托广场的一侧，得到了一个更大的开放式办公平面布局，便于适应使用者的密度增长，同时在底层大厅的主入口处形成了一个可供人们汇聚交流的公共空间及画廊。
首层大厅的改造
采用高品质材料和饰面对接待区及其他主要内部空间进行了升级改造，营造一个智能、现代化办公场所，同时兼顾了与保护建筑部分的细节处理相协调。
办公空间
原先的吊顶被拆除，安装新的照明，加强空间感和光线感。
协作空间
原本的 Which 总部并没有协作空间，KPF在新的核心筒旁设置类似于“工作站”的创新空间，包括多样化的封闭及半封闭空间，来满足不同的会议需求。
原本的佩托广场是被四周单调的建筑背面墙所围绕，Which总部新设的幕墙由透明及半透明玻璃板组成，这为佩托广场带来了全新的生机和活力。
生动的顶层空间
设计上最具亮点的部分要属创新性的“阁楼”空间，可同时满足会议，用餐以及天台活动等不同的空间需求，方案利用现有20世纪80年代建筑的大平屋顶创建了一个独特几何形状的附加楼层。新的“阁楼”基于大楼原有结构基础上构建，避免产生对大楼主体的结构的挑战。一整面可旋转活动墙面的设置使得“阁楼”空间可根据需求进行分隔或合并。盘错的屋顶造型和谐地融入周边肌理，最大限度的降低了对历史街区的视觉冲击，是KPF一贯以来环境敏感型设计的成果。
The Which Headquarters is located in the London Borough of Camden. Regent’s Park is located to the northwest, separated from the site by Peto Place and Park Square East - a row of Grade II-listed John Nash terraces.
This complex conservation and retrofit project has remodelled an existing hybrid building – part Grade II*-listed Georgian terrace and part 1980’s concrete-framed office building， KPF was commissioned by Which? The Consumer’Association, team up with interior designer HLW, renovating the space to meet the needs of a modern charity and business.
The Grade II*-listed building linked directly, by way of doors and hallway, to the modern extension on Albany Street. But, the core of the new building was an impediment to connectivity across the whole site. KPF’s objective was to create a more unified building with improved flow across the ground floor. KPF’s concept for the ground floor was to remove parts of the 1980s concrete core at the threshold of the listed building, improving connectivity and creating a new meeting space and gallery on the ground floor.
Making structural changes, such as the new lift locations and the removal of elements of the internal core, created a larger open-plan office layout allowing for improvement to the occupational density.
The reception area and other key internal spaces have been upgraded with high-quality materials and finishes to create a smart and contemporary workplace, while remaining sympathetic to the nature of the listed building’s original details.
A feeling of space and light has been created by removing the suspended ceiling, white-washing the soffit, rationalising services and installing new lighting.
Workspaces have been rationalised for a flexible fit to allow for changes in working practices. Formerly, Which? had no collaboration space, new areas have been located near the new lift core to create hubs on each level. These areas are a combination of enclosed rooms and semi-private sections of spaces to suit various needs.
Extra space has been created by extending over the service ramp and an uninspired 1980s façade has been replaced with a dramatic new skin of transparent and translucent panels. Prior to the addition of the new façade, Peto Place was largely surrounded by the rear of buildings. By treating
this as a principal façade, Peto Place has been transformed.
Most strikingly, the scheme has utilised the large flat roof of the existing 1980s building to create an additional storey with a unique and complex geometric form. The new roof and fourth floor has reused the existing structure of the building, avoiding the need for major reinforcement. The new floor accommodates a conference facility, canteen and accessible terrace to provide dynamic and versatile meeting, event and amenity space.
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