Yoshinogawa Valley Iyacapan Calli Iyancuilistli by Wataru Sato

Yoshinogawa Valley Iyacapan Calli Iyancuilistli by Wataru Sato is a highly esteemed winner of the very prestigious 2026 Mahuizolli A' Design Award Bronse in Calchihualiztli, Calmanaliztli ihuan Tlatecpanaliztli Tlachihchihualiztli Competition Category.

BronseCalchihualiztli· 2026

Yoshinogawa Valley Iyacapan Calli Iyancuilistli

by Wataru Sato

Client: KITAOKA Group

Mahuizolli A' Design Award Bronse Winner in Calchihualiztli Category

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The Design

About Yoshinogawa Valley Iyacapan Calli Iyancuilistli

Inin tequitl ce yancuilistli ipan ce caltequitiloyan tlen ye quipia ompoalli xihuitl, otlachihchiuhca ica tlamantli achto omochihchiuhqueh, ihuan amo omoxitini. Ce coyoctli melahuac tlen quipia ompoalli ihuan matlactli metros omocalaquih itech inepantla in calli tlen ye onca, omoquetzalti ica in iohhui tonalquizayan-tonalcalaquiyan in Atoyatl Yoshino, ihuan ihqui in omoyancuili in calli ipan ome tlapalli mictlampa-huitztlampa. Itoca Yoshino Atoyatl Tepetzalan, inin tlachihualiztli in yeyantli quichihua in icuitlapil in calmanaliztli. Ce tlanextli tlen tlachia mictlampa quitemaca tonalmeyotl tlen amo mopatla, ihuan in ehecatl calaqui ihuan quiza iselti ica in tlamantli tlen ahmo neneuhqui in inhuecapan ihuan in impatzquiliz. Ica in iyancuilistli in calli, inin tequitl amo quixelohua in tlazohtlaloni tlen quipalehuia.

The Recognition

About the Mahuizolli A' Design Award Bronse

Yoshinogawa Valley Iyacapan Calli Iyancuilistli ca in quicuic in Mahuizolli A' Design Award Bronse, hueyi tlamahuizoliztli tlen momaca in cualli tlachihualli in motenehua ipampa yancuic tlamantli, tlamatiliztli ihuan ixtlamatiliztli. In quicuicah Bronse ca tlachihualli in quipia toltecayotl ihuan quinextia in cenca miac nemiliztli ihuan tlamatiliztli intlachihuanime. Ca quinequi in Yoshinogawa Valley Iyacapan Calli Iyancuilistli ca tlazohtli tlamantli, mahuiztic ihuan cualli. Ni dizayno in quicuic Bronse quipia cualli toltecayotl ihuan quitta in tlen tepiton. Yoshinogawa Valley Iyacapan Calli Iyancuilistli quipaquiltia in tlacah ihuan quitlamahuiztiltia in intlanequiliz.

Behind the Design

Press Kit

Credits, team members and technical details provided by the designer.

Unique Properties: Inspired by the Yoshinogawa River, the design translates the structure of a valley into architecture. By dividing the existing building into two volumes and inserting a linear void, a valley-like interior is created.
A 50-meter skylight brings daylight inside, while the void enables ventilation, greenery, and social interaction. This configuration integrates environmental elements into the workplace.
Through renovation, the design reinterprets an existing office and proposes a new spatial model.
Dimensions & Packaging: A valley-like void and continuous skylight are introduced at the center of a 50-meter prefabricated office building. The two-story void brings daylight to the ground floor and enhances natural ventilation.
A 7-meter Benjamin fig tree is placed at the center, visible from both levels. Planting along the void forms a layered green environment connected to the exterior.
Existing structure and finishes are retained, creating a composition where old and new materials coexist.
Tags: Prefabricated office renovation, open lounge, atrium and skylight, regional architecture, nature-inspired workspace, Yoshino River
Production Technology: The project renovates an existing prefabricated office building without demolition.
A central valley-like void integrates daylight, ventilation, and greenery. Continuous skylights provide stable north light, while passive ventilation is driven by height and pressure differences.
Spatial organization is redefined as an environmental system, reducing reliance on mechanical equipment. Existing structure and finishes are retained, forming a layered expression and a sustainable model for reuse.
Design Challenge: The primary challenge was to renew the environmental and social value of a deteriorated prefabricated office without demolition or new construction.
Introducing a skylight and central void into an enclosed structure required coordination of structural, safety, and cost constraints.
Rather than relying on equipment, the design redefines spatial organization as an environmental system.
The project shows that architectural operations can generate new value within existing buildings.
Research: This research examines how renovation can achieve environmental performance comparable to new construction.
A skylight and central void introduce daylight and passive ventilation, reducing reliance on mechanical systems.
Monitoring shows that artificial lighting is unnecessary during daytime and HVAC demand is reduced. Annual energy decreased by about 73,000 kWh, with savings of 65% in lighting and 30% in air conditioning.
The project presents a replicable model for sustainable renovation.
Inspiration: The project draws inspiration from the Yoshinogawa River, known as the Mother River of Tokushima.
Rather than referencing its form directly, the design interprets the river as a spatial structure.
By inserting a linear void through the existing building, the architecture transforms the logic of a valley into an interior condition, bringing light, wind, and greenery deep into the space, while also inviting relationships among people, families, and the local community.
Project Duration: The project started in January 2023 in Miyoshi Town, Tokushima Prefecture, Japan, and was completed in August 2024.
Operation Flow: The building transforms a closed office into an open environment accessible to families and the local community.
The central valley acts as a social axis supporting movement, staying, and interaction. The ground floor serves as a shared space, while the upper floor provides flexible work areas.
Users are not assigned fixed workplaces but choose spaces as needed. Through everyday use, the project encourages informal encounters and redefines how work and social life coexist.
Image Credits: Image #1: Photographer Keita Yamamoto (Architectural Photography), Kitaoka Group Headquarters Renovation, 2024.
Image #2: Photographer Keita Yamamoto (Architectural Photography), Kitaoka Group Headquarters Renovation, 2024.
Image #3: Photographer Keita Yamamoto (Architectural Photography), Kitaoka Group Headquarters Renovation, 2024.
Image #4: Photographer Keita Yamamoto (Architectural Photography), Kitaoka Group Headquarters Renovation, 2024.
Image #5: Photographer Keita Yamamoto (Architectural Photography), Kitaoka Group Headquarters Renovation, 2024.