Shinjuku Eastside Square

Shinjuku Eastside Square is a large mixed-use development in central Tokyo's Higashi-Shinjuku area, occupying approximately 3.7 hectares and directly connected to Higashi-Shinjuku Station. Part of the area's urban regeneration program, it includes a 20-story office tower, extensive underground retail facilities and public plazas. Its most striking feature is a distinctive glass curtain wall: modules of different sizes and inclinations form an apparently random arrangement, producing a kaleidoscopic effect. Inspired by the diversity and energy of Shinjuku's streets, the facade changes with the light and viewpoint, bringing movement to the skyline. Eastside Square also places particular emphasis on public space. The building is set back to create a broad pedestrian plaza, with outdoor stepped seating that uses changes in ground level to provide places to rest and socialize. Below the plaza, planting and sunlight enliven an open sunken atrium, adding a relaxed, welcoming atmosphere to this busy metropolitan district. Its bold exterior and people-focused public spaces have made Eastside Square a Higashi-Shinjuku landmark.

Design Concept and Features

An Urban Mosaic Facade:Eastside Square's design reflects Shinjuku's diverse, bustling character. The architects used a random-texture concept, abstracting the district's colorful streets into a mosaic of glass panels of different sizes. Transparent, translucent and ceramic-treated glazing creates changing tones in sunny and overcast conditions; at night, varying interior light levels make the building resemble a moving artwork. The inclination of the glass is particularly distinctive: some panels tilt slightly outward and others inward, catching and reflecting the sky, street trees and neighboring neon signs. This ordered randomness departs from the repetitive window grids of conventional offices, introducing a youthful architectural language. Varying the glass angles also reduces the risk of reflected glare, bringing appearance and performance together.

Public Space Across Multiple Levels:Eastside Square carefully integrates public space throughout the development. Broad steps connect the ground-level and sunken plazas, guiding views and pedestrian movement. Events such as the annual Shinjuku street dance festival and outdoor concerts turn the stepped seating into a stage and auditorium, strengthening the connection with the community. Public art beside the plaza provides a popular gathering and photography spot. Restaurants and shops surround the sunken plaza, where generous ceiling heights and skylights bring daylight into the underground spaces. A public route crosses the office lobby and connects to the station passage, while facilities such as a 24-hour convenience store serve the neighborhood. These measures turn private development into shared urban space and improve pedestrian provision in Higashi-Shinjuku.

Leadfu's Integrated One-Stop Service

We undertook the design and construction of Eastside Square's distinctive curtain wall and the structural integration of its ground-level public spaces. For nonstandard glass modules at varying angles, we used three-dimensional digital modeling and cutting workflows to calculate each panel's dimensions and inclination. A semi-unitized system grouped adjacent modules into larger panels, preassembled in the factory and installed on site to maintain consistent joints and alignment. We also developed adjustable connectors that allowed fine adjustment of the glass supports to achieve the specified inclinations while maintaining air and water tightness. The structure beneath the stepped seating spans the sunken plaza using reinforced concrete and structural steel. We coordinated reserved openings and curtain wall anchors to support connections between levels and the installation of glass balustrades. Integrated management throughout the process delivered this complex facade and public realm to a high standard. After completion, we provided maintenance training for the owner to support facade cleaning and building-services upkeep over the long term.

Spatial Planning and Facade Design

• Integrated Functions:The main tower provides approximately 80,000 square meters of office space, primarily occupied by IT and creative businesses. Retail and leisure facilities extend from the second basement to the second floor, including restaurants, a food court, a large fitness center and lifestyle shops for workers and residents. Proximity to Kabukicho and Okubo also attracts evening and weekend visitors. A direct underground connection to Higashi-Shinjuku Station and basement parking improve accessibility.
• Energy-Efficient Facade:The office tower uses a double-skin curtain wall with an inner layer of Low-E glass for thermal insulation and an outer layer of glass at varying angles to form an air cavity. Sensor-controlled blinds within the cavity adjust to sunlight and reduce cooling loadsmjd.co.jp. Glass of different transparencies also diffuses daylight in parts of the facade, reducing glare and providing even natural illumination. Extensive glazing over the sunken plaza and open entrances, combined with seasonal mechanical ventilation, reduce underground air-conditioning demand.
• Environmental Responsibility and Innovation:Eastside Square seeks to reduce environmental impact and achieved the highest grade in Tokyo's environmental performance assessment. Its water-saving system recovers water associated with cooling-tower evaporation losses for toilet flushing and irrigation. Rooftop solar water heaters supply the fitness center. The project also combines public art and architectural lighting: at night, the randomly arranged transparent and translucent glass becomes a large projection surface for changing LED light patterns. By meeting commercial objectives while delivering public and environmental benefits, the project provides an example of a new model of private development in Tokyo.

With its kaleidoscopic facade and welcoming public spaces, Shinjuku Eastside Square presents a new image of Shinjuku: energetic yet ordered, diverse and inclusive. It challenges conventional office architecture and offers valuable lessons in creating shared spaces and supporting community life in a dense city, making it a significant example of central Tokyo redevelopment.