Architect：KEY OPERATION INC. / ARCHITECTS;X-ARC Urban Architects

Location：Yokohama, Kanagawa Prefecture, Japan; | ;

Project Year：2021

Category：Apartments

Apartment blocks sprang up across Japan after World War II, and by 2019, there were over 6.6 million units nationwide. Large buildings with over a hundred units, such as this one, significantly impact the appearance of the urban landscape. Many large multi-unit buildings have continuous balconies along their facades to improve the efficiency of emergency evacuations, and outdoor air conditioners are often placed on these balconies as well. This gives rise to the characteristic look of many apartment blocks, with balconies running the length of each floor punctuated by dividing walls between units.

Beginning in the 1980s, developers began using tiled facades to give their buildings a classy appearance and improve marketability. But while tiling did raise the value of the units, in recent years accidents involving falling tiles have become a problem. This project seeks to redefine the familiar balcony-and-tile apartment block with a new look.

The facade of the residential portion of the building, which starts on the second floor, does indeed feature balconies across the length of each floor. However, an outer skin punctuated by evenly spaced openings wraps over the balconies, blending the upper floors with the commercial-use first floor and lending ambiguity to the facade, which could just as easily conceal a business complex as a residential one.

Instead of tiling the exterior, we used concrete imprinted with grooved formwork to reference the appearance of Yokohama’s classic brick buildings. A clear coating makes the concrete look like grey brick from a distance. We initially considered finishing the inside of the balconies with wood paneling, but due to the challenges of maintenance in apartment blocks, we settled on concrete imprinted with vertical grooves at intervals the width of wood panels. A light undercoat and darker topcoat were applied to the concrete, which was then scraped with a wood-graining tool before the stain dried to replicate wood panels.

In this project, an ambiguous concrete skin serves multiple function: referencing urban history, contributing to the cityscape, revitalizing the community, adding value for buyers and sellers, and easing maintenance. It is our hope that the project offers a new model for apartment block design.

Client: Tohshin Partners Co., Ltd. 

Architect: Akira Koyama + KEY OPERATION INC. / ARCHITECTS

Execution Architect: X-ARC Urban Architects

Contractor:  Daisho Structure： TERRA Structural Design Office

Service engineer: Yayoi Sekkei

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