Office B was conceived not only as a workplace, but as a catalyst for its surrounding neighbourhood. Commissioned by BEANS Ltd., a Tokyo-based contractor, the project responds to a brief that combines offices, guest accommodation, and storage within a constrained site in Chiba. The area is characterised by low-rise housing and small workshops, where new buildings often occupy the entire plot, offering little back to the shared urban environment. The proposal challenges this condition by accommodating the required programme while contributing to the everyday life of the street. The design begins with the ground plane, typically the most constrained and enclosed part of such developments. Here, it is reimagined as an open and permeable layer. Rather than a closed garage or storage volume, the base becomes a green, piloti-like space that sits between interior and exterior. It supports a range of activities, from storing materials and parking vehicles to informal making and outdoor gathering. Its openness extends beyond the site boundary, inviting interaction and softening the threshold between the company and its surroundings. This spatial strategy is enabled by an inversion of structure. A robust steel frame defines the perimeter, from which the main volumes are suspended. By lifting the programme above, the ground is released as a continuous and flexible space. At the same time, this gesture gives the building a clear architectural identity, allowing it to be read as an active presence within the neighbourhood rather than a closed object. The programme is organised vertically. The office is positioned at the top level, rising above the surrounding two-storey houses to access expansive views and daylight. From here, the city unfolds towards the horizon, with distant glimpses of Tokyo Bay. Below, the guest accommodation occupies the intermediate level, conceived as a flexible volume that can be enclosed for privacy or opened towards surrounding terraces. This arrangement produces a layered sequence of conditions, from the collective openness of the ground to the more intimate yet adaptable spaces above. Storage, essential to the client’s activities, is integrated into this system without compromising spatial openness. Containers, movable racks, and suspended elements are incorporated within the structural frame, enabling efficient organisation while maintaining a sense of lightness. The building reflects the practical and hands-on nature of the contractor, where construction logic and spatial expression align. Beyond its immediate function, Office B explores a broader typology for small workplaces within residential contexts. By resisting full enclosure and returning space to the ground, it introduces a form of spatial exchange between private use and the city. In doing so, it suggests how even modest-scale interventions can disrupt the monotony of residential fabric and contribute to a more generous and active urban condition. The collaboration with Tokyo-based studio Ishimura + Neichi frames this approach as a shared proposition, an office that does not withdraw from its surroundings, but engages with them through openness, reversal, and the provision of collective space.