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Office · Hibiya, Tokyo · Consulting & IT

Business Brain Showa-Ota — Hibiya: meeting rooms named after traditional colours

When this accounting consultancy moved to Hibiya Fort Tower in December 2021 it cut its floor area by forty per cent. The meeting rooms were then named by staff vote, from a list of traditional Japanese colours, and each room was finished in the colour it was given.

Company Business Brain Showa-Ota Inc. (ビジネスブレイン太田昭和)Office Hibiya Fort Tower; reception on 15FMoved in December 2021Floor area About 40% less than the previous officeMeeting rooms Named after traditional Japanese colours, chosen by staff voteSeminar rooms Kikyō and Ruri, combining for 50+ peopleWebsite bbs.co.jp ↗
The reception hall
The reception hall

Concept

History and the near future, in one room

The design was given two things to hold at once: the history of a company that has supported its clients’ accounting for decades, and the near future it intends to support their digital change with. The reception reads as both — a glowing white core, timber around it, and a tree.

The practical half of the brief was subtraction. Moving to Hibiya cut the occupied area by forty per cent, on the assumption that people would not all be in at once.

The reception hall from the lift
The reception hall from the lift
The reception desk
The reception desk

01 · Reception

A lit core, wrapped in timber

The reception is the part the company is proudest of: a pale, lit core with timber and planting set against it, and a single tree by the glass.

The reception desk
The reception desk
The tree at reception
The tree at reception
The tree against the glass
The tree against the glass

02 · The corridor

A loop, not a dead end

The meeting rooms are reached by a corridor that runs as a loop, so that every room is easy to get to from anywhere.

The corridor
The corridor
The corridor, looking back
The corridor, looking back

03 · Meeting rooms

Amber, ultramarine, canary, indigo

The rooms are named after traditional Japanese colours and finished in them. Three of them — ultramarine, canary and indigo — are glazed and filmed with a gradient, so they stay bright while staying private.

A meeting room
A meeting room
A meeting room with the city behind
A meeting room with the city behind
Acoustic panels and chairs
Acoustic panels and chairs

04 · Seminar rooms

Two that become one

Beside reception, the seminar rooms Kikyō and Ruri open into a single room seating more than fifty, used for training, briefings and the annual entrance ceremony. The room Yamabuki sits next door and doubles as an anteroom.

A seminar room set with chairs
A seminar room set with chairs
A meeting room with a checkerboard wall
A meeting room with a checkerboard wall

05 · Sakura

The room they cared about most

Sakura is the executive room, named after the flower that stands for Japan. It has high-backed chairs, lighting arranged so no seat is in shadow, and a floor whose gradient runs outward towards the glass. The city is below, and the room reads completely differently by day and by night.

The executive room
The executive room

06 · Work floor

Free address, and three ways to sit

The working floor is free address. Beyond the ordinary desks there is a café-like run of counter and sofa seats with planting, and a set of partitioned booths for concentration — three registers, chosen by the hour. Tokyo Tower is visible from the window wall.

The work floor
The work floor
Counter seats
Counter seats
Booth seats
Booth seats

07 · Collab and refresh

The last two rooms

The collaboration area is for talking across departments and ranks, with sofas, stools and a whiteboard. The refresh area is where lunch and breaks happen, with vending machines and a counter selling bread, deli food and snacks.

The collaboration area
The collaboration area
The refresh area
The refresh area
CompanyBusiness Brain Showa-Ota Inc.
Design[to confirm]
Photography© Nakasa & Partners / Traverse Photography, courtesy of Business Brain Showa-Ota Inc.
SourceBusiness Brain Showa-Ota, “Office”, re-reported by WALL ↗
PublishedSeptember 2026
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