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Office · Nishi-Shimbashi, Tokyo · Real estate

Mitsui & Co. Real Estate — Nishi-Shimbashi: an office with a public lounge under it

A developer that spends its days drawing out what old buildings can still do decided to try the idea on itself. Its own head office is a seamless floor with no assigned desks, and three floors down sits a lounge that is open to the street, not just to staff.

Company Mitsui & Co. Real Estate Ltd. (三井物産都市開発)Location Hibiya Central Building, 1-2-9 Nishi-Shimbashi, Minato, TokyoDesks Free address — no assigned seatsLounge HIBIYA CENTRAL THE LOUNGE, 3FLounge hours Weekdays 8:45–19:00 (café 8:45–17:30, bar 17:30–19:00)Shown Work floor, meeting spaces, the loungeWebsite mbtk.co.jp ↗
The work floor
The work floor

Concept

“Draw out what the building can still do”

The company describes its own office in two lines: an office that draws out the possibilities of the building and carries it into a new era, and a seamless design that makes use of the outline of the space.

In practice that means the floor is not chopped into rooms. Desks are free address — you sit where the day suggests — and the edges between working, meeting and resting are left soft rather than walled.

Seating along the floor
Seating along the floor
A meeting corner
A meeting corner

01 · Work floor

Sit where the day suggests

Nobody owns a desk. The floor is laid out so that a person can move between a quiet seat, a shared table and a short meeting without booking anything.

The open work floor
The open work floor
Another part of the floor
Another part of the floor

02 · Meeting

Rooms and half-rooms

Meeting space runs from proper rooms to open tables, so the size of the talk decides where it happens.

A meeting room
A meeting room
An open meeting table
An open meeting table

03 · Between the two

The seams

The design deliberately keeps the seams between areas open, which is what the company means by working with the outline of a space rather than against it.

Where one area meets the next
Where one area meets the next
A corner seat
A corner seat

04 · The lounge

A curation lounge on the third floor

Three floors below the office is HIBIYA CENTRAL THE LOUNGE. It is described as a curation lounge: every so often a curator sets a theme and the work of someone who has gone deep into that field is put on display, so that visitors meet something they did not know.

It is open on weekdays from 8:45 to 19:00, runs as a café until 17:30 and as a bar after that, and anyone may come and go. There are power sockets, free Wi-Fi, and food and drink are allowed.

The lounge
The lounge
The counter
The counter
Seating in the lounge
Seating in the lounge

05 · For staff

Free drinks next door

For employees the lounge doubles as the company kitchen: drinks there are free to staff.

A seat in the lounge
A seat in the lounge
The lounge at another hour
The lounge at another hour
CompanyMitsui & Co. Real Estate Ltd.
Design[to confirm]
Photography© Mitsui & Co. Real Estate Ltd. (from the company’s own site)
SourceMitsui & Co. Real Estate, “Office” and HIBIYA CENTRAL THE LOUNGE, re-reported by WALL ↗
PublishedSeptember 2026
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