The 97-year-old building, formally owned by a bank, is located in the heart of Japan’s financial district, Nihonbashi Kabutocho. K5 is not only a boutique hotel, or merely a collection of the best restaurants and bars, but rather it compromises of ‘micro compounds’ that make the building one whole.


Bringing together unique collaborators to form a relationship (or rather, friendship) we collaboratively shaped the building into what we now call K5.

A major topic of discussion throughout the process was how to make non-quantifiable values outweigh their quantifiable counterparts. The challenge was to ensure that “experience” and “creativity” would always have an advantage over its quantifiable counterpart of economic rationality.

Project owner

K5 inc.


Ferment inc.

Space design

Claesson Koivisto Rune

Design and construction



Heiwa Real Estate Co., Ltd.

Project Management

Insitu japan inc.

Branding and tenant curation

Media Surf Communications inc.

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