Tokyo Architecture: Hidden Geology in a Shin Nakano Condo
Aug 28
4 min read
Beneath the quiet streets of western Tokyo lies a plateau that existed long before the city, shaped by rivers and groundwater before Nakano was filled with apartments and narrow lanes. Most people don’t think about what’s below them, but a new residential building in the Chuo district invites them to pay attention.
Shin Nakano Condo. Photography by Takumi Ota Photography
SHIN NAKANO is a five-story, trapezoid-shaped condominium designed by Ryuichi Sasaki Architecture for Real Partners. The building brings the hidden Musashino Plateau into daily life. With eleven units across 416.68 square meters, the design uses the plateau as a theme that residents notice as they go to work, walk the stairs, or watch light move across their walls.
Sasaki and his team had to fit a compact condominium onto a small 152.27-square-meter site, which could have led to a plain, practical building. Instead, they chose to highlight the site's geological history and made the plateau the main focus of the design.
“The Musashino Plateau is one of those landscapes that people live on without ever seeing. Our challenge was to take something as abstract as a position within a plateau and translate it into a motif that residents encounter every day — in the facade they walk past, in the shadows on the stairs, in the light that reaches their rooms.” - Ryuichi Sasaki, CEO and Principal Architect.
The building’s trapezoidal shape comes from its location near the center of the plateau, turning a map detail into a design feature. On the street side, this shape is built into the structure using custom formwork, stainless steel, and concrete, poured in a single pour. The facade changes throughout the day as the matte steel, window reflections, and concrete texture each catch the light differently.
Shin Nakano Condo. Photography by Takumi Ota Photography Shin Nakano Condo. Photography by Takumi Ota Photography
The geometric theme continues inside. Trapezoidal columns and matching tiles line the entrance, casting soft shadows like the shade under trees. The staircase has grated steps and trapezoidal openings, making it feel more like walking under a leafy canopy than using a regular stairwell. Lighting by Natsuha Kameoka of Lighting Sou carries this feeling into the evening, so the building retains its character after dark.
With only 84.86 square meters of space, the building had to make good use of every side. Instead of seeing this as a problem, the design uses the street on one side and a park on the other to bring in natural light and fresh air from both directions. This smart approach shapes not just how each unit feels, but also how it functions.
The windows facing the park let in more than just daylight. They frame views of trees and bring in the sounds of a nearby daycare, giving residents a sense of connection to the wider community, not just the street. This small detail helps the building feel rooted in the neighbourhood and shows that even a small site can be part of something bigger.
Shin Nakano Condo. Photography by Takumi Ota Photography Shin Nakano Condo. Photography by Takumi Ota Photography
Inside, the design uses calm white tones so the trapezoidal shapes stand out without extra colour or decoration. Openings in the walls and a patterned glass balustrade, visible from the street, connect the inside to the outside, making the building feel like a single, unified idea. In the maisonette units, a sloped atrium lets in filtered light, creating a living space that changes gently throughout the day.
Light in these homes comes from several sources. The atrium, skylight, and windows on both sides give each room a unique feel as the sun moves, much like how light shifts on a forest floor. This creates a gentle sense of luxury, based on atmosphere rather than size.
Shin Nakano Condo. Render by Ryuichi Sasaki Architecture Shin Nakano Condo. Photography by Takumi Ota Photography
“A residential building of this scale is experienced in fragments — an entrance, a stair, a window — so the motif had to work at every one of those moments. We are proud to offer the residents of Nakano a building that connects them, quietly and daily, to the ground it stands on.” - Ryuichi Sasaki, CEO and Principal Architect.
With only eleven units, SHIN NAKANO trapezoidal is not meant to be Tokyo's most visible landmark. Its goal is quieter and perhaps more lasting: to turn hidden geological history into something residents can experience and watch change with the weather. In a city built over centuries, it serves as a small reminder of what lies beneath.
Shin Nakano Condo. Photography by Takumi Ota Photography Shin Nakano Condo. Photography by Takumi Ota Photography Shin Nakano Condo. Photography by Takumi Ota Photography Shin Nakano Condo. Photography by Takumi Ota Photography Shin Nakano Condo. Photography by Takumi Ota Photography Shin Nakano Condo. Photography by Takumi Ota Photography Shin Nakano Condo. Photography by Takumi Ota Photography Shin Nakano Condo. Photography by Takumi Ota Photography Shin Nakano Condo. Photography by Takumi Ota Photography Shin Nakano Condo. Render by Ryuichi Sasaki Architecture
Credit & Technical sheet
Project name: SHIN NAKANO trapezoidal
Building name: GRANTAGE SHIN NAKANO
Client: Sho Ishihara / Real Partners
Lead architect: Ryuichi Sasaki / Ryuichi Sasaki Architecture
Architecture team: Ryuichi Sasaki, Yuriko Ogura, Anna Osawa / Ryuichi Sasaki Architecture
Structural engineer: Tatsumi Terado Structural Studio
Lighting design: Natsuha Kameoka / Lighting Sou
Contractor: Magome Construction Company
