Yokohama Symphostage

Complex Building for OBAYASHI CORPORATION

This is a complex building with a total floor area of approx. 180,000m2 and connected to the pedestrian network, an infrastructure linking central Yokohama and its surrounding areas. The distinctive feature of this project is that it creates a multi-layered plaza space while utilizing the existing pedestrian space. The exterior design of the office area above the lower public area is multi-layered, providing a comfortable working environment. The hotel on the upper floors has become a city landmark, taking advantage of Yokohama's seaside location.

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Yokohama Symphostage by Ryosuke Okawa

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Complex Building by Ryosuke Okawa

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Ryosuke Okawa Yokohama Symphostage

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Ryosuke Okawa Complex Building

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Unique Properties

This is a complex with a total floor area of approx. 180,000 m2 and connected to the pedestrian network, an important infrastructure linking central Yokohama and its surrounding areas.Located on a site intersected by two key pedestrian axis which connect the Minato Mirai district to surrounding areas. Historically disconnected, these pedestrian spaces are revitalized and interconnected through a multi-layered plaza and lively public facilities where people can gather during events and disasters.

Tags

Architecture, Pedestrian, Plaza, Seascape, Simulation, Sustainability, BELS, ZEB, Obayashi

Production Technology

The multi-layered plaza was planned using simulations for wind, sunlight, and pedestrian flow to optimize each space for its intended use. The large glass roofs adjust the environment of semi-outdoor spaces.For the office areas, solar simulations led to the exterior wall design to achieve an optimal balance of sunlight for air conditioning and lighting efficiency. Automated control of jalousie windows and blinds further integrates environmental factors into a comfortable working environment.

Design Challenge

Achieving Cost-Effective Energy Savings and Decarbonization with Advanced Design Methods The project utilized advanced heat load simulations (EcoSimule) to strategically incorporate features such as double-skin curtain walls, solar shading fins, and energy-efficient air conditioning systems selected for their cost-effectiveness. As a result, the project efficiently achieved BELS 5-star, ZEB Ready, and CASBEE Yokohama S-rank certifications.

Project Duration

Location : Minato Mirai, Yokohama City, Kanagawa, Japan Construction period : April 2021 - March 2024

Operation Flow

The main circulation paths traverse the first and second floors of the site, with vibrant public facilities concentrated in the lower levels. Adjacent multi-layered plazas are tailored to the characteristics of these facilities, designed to allow indoor activities to blend seamlessly with the outdoors. These spaces aim to amplify and diffuse activities across external areas and other floors.

Research

The project deployed unique methodologies exclusive to our Technical Research Institute. Wind environment simulations covering the entire area validated the minimal impact on the environment. This confirmed the utility of high-rise terraces, and natural ventilation systems. Additional achievements included evacuation planning through comprehensive safety assessments, acoustic environment simulations for complex geometries, and the creation of organically shaped benches by 3D printing.

Inspiration

Taking advantage of the strengths of a consortium involving several business owners, the public facility is a developed sterically space with multiple uses being developed in an organic organizational manner, with each business owner taking charge of the programs in which they excel.The plaza is used for various lively events, including music events hosted by Yokohama City and Yamaha, creating an environment where people naturally gather.

Image Credits

Photographer Image#1,#5: Naomichi Sode (SS Co., Ltd) Image#2,#3,#4: Shinkenchiku-sha

Project Overview

Yokohama Symphostage Complex Building has been a Silver winner in the Architecture, Building and Structure Design award category in the year 2024 organized by the prestigious A' Design Award & Competition. The Silver A' Design Award celebrates top-tier designs that embody excellence and innovation. This award acknowledges creations that are not only aesthetically pleasing but also highly functional, reflecting the designer's deep understanding and skill. Silver A' Design Award recipients are recognized for their contribution to raising industry standards and advancing the practice of design. Their work often incorporates original innovations and elicits a strong emotional response, making a notable impact on the improvement of everyday life.

Silver Recognition

Ryosuke Okawa was recognized with the coveted Silver A' Design Award in 2025, a testament to excellence of their work Yokohama Symphostage Complex Building.

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