A Timber Showroom That Became a Post Office
The Kawamoku Headquarters Office Building, formerly the Rokkenmachi Post Office (カワモク本部事務所棟（旧六軒町郵便局）, Kawamoku Honbu Jimushotō), is a Western-style wooden building of 1927 standing on a corner lot in Kawagoe City, Saitama Prefecture, and it was entered on Japan's national register of Tangible Cultural Properties on 12 December 1997.
It began as a showroom for fine timber. The Agency for Cultural Affairs records that a meiboku display hall was built on this corner, and local accounts hold that the corner itself was created when a new road was cut through the yard of the Tandoku timber merchants, the firm known today as Kawamoku. Around 1937 the building was reworked into the Rokkenmachi Post Office, and it served that role for a long stretch of the twentieth century. Design and construction were both handled by Mori Tomekichi, a builder from the neighbourhood.
Two storeys, timber framed, roofed in sheet metal, with a footprint of 81 square metres. The register's own note on the date carries a small inconsistency: the period field describes work around 1937 as an extension, while the commentary calls it a conversion. Whichever term fits better, the building visible today is the result of two campaigns roughly a decade apart.
What makes it hold the corner is the roof. Rather than turning the eaves neatly around the angle, the design pushes them upward at that point so the roof reads as a small tower. The corner face itself steps forward through both storeys. Below, white weatherboarding runs in horizontal courses and the windows sit in continuous bands. None of this is expensive architecture. It is a local builder using cheap and available materials to make a modest structure command an intersection, and it worked well enough that the Agency for Cultural Affairs calls the building widely known as a symbol of the Rokkenmachi neighbourhood.
Registration, and Why This Building Qualified
Japan protects historic buildings under two separate systems, and confusing them is easy. National Treasures and Important Cultural Properties are designated: chosen by the state, subject to permission before any change, and supported by substantial public funding. Registered Tangible Cultural Properties belong to a lighter system created in 1996 for buildings of roughly fifty years or more. Registration asks owners to notify the authorities before major exterior alteration and otherwise leaves them free to keep using the property. Modern commercial and civic buildings, which rarely meet the bar for designation but shape the character of a street, are exactly what the register was built for.
This building carries registration number 11-0004 from the seventh round of registrations, with public notice on 8 January 1998. The criterion applied was contribution to the historical landscape of the country. Kawagoe's own heritage tally places it second among the city's national registered structures, after the former head office of the Eighty-Fifth Bank. Ownership is private.
The classification recorded for it is government office, a category that fits its post office years rather than the timber showroom it began as or the commercial premises it is now. That layering is part of the interest. Kawagoe draws visitors for its Edo-period kurazukuri merchant streets, and it is easy to leave with the impression that the city's architecture stops in the nineteenth century. The blocks around Kawagoeshi Station tell a different story about the 1920s and 1930s, when a prosperous provincial town built in Western idioms using local carpenters rather than metropolitan architects.
One small puzzle worth naming: the building stands at Tamachi 5-1, while the post office it housed was named for Rokkenmachi, the adjoining district. Central Kawagoe's ward boundaries were reorganised in the postwar decades, and the name outlasted the address.
Visiting the Corner
The building sits about two to four minutes' walk north of Kawagoeshi Station on the Tōbu Tōjō Line, or roughly seven minutes from Hon-Kawagoe Station on the Seibu Shinjuku Line. From JR and Tōbu Kawagoe Station it is around twenty minutes on foot.
It remains in commercial use and has operated as a restaurant in recent years, so the interior is accessible only as a customer and only when the current tenant is trading. Confirm before planning around it. The exterior can be photographed freely from the public street, and the corner rewards walking right around it: the tower-like roof reads completely differently from each of the two street faces that meet beneath it.
Directly opposite stands Tandoku Garden, which makes the pairing unusually rewarding. The Suzuki family founded their timber business in 1869 as Tanbaya, and in 1901 the first-generation head built the detached wing that visitors see today, set in a dry landscape garden of about 660 square metres. The main house and its Western-style reception room were added by the second generation in 1929. The garden opened to the public in 2018 and offers matcha experiences, wasanbon sweet-making, reserved lunches, and whole-building bookings. Its address is Rokkenmachi 1-8-2. Roof tiles here carry the character tan from the shop name, and the deep dashigeta bracketed eaves are worth looking up for.
Seen together, the two buildings across the street from one another describe a single family's approach to display. One is a Japanese merchant house showing what timber can do when handled by craftsmen. The other is a Western-clad box that used a roof and a projecting corner to advertise the same trade to a modernising town. Both are still standing, still in use, and about ninety seconds apart on foot.
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Q&A
- Can visitors go inside the Kawamoku Headquarters Office Building (former Rokkenmachi Post Office)?
- The building is privately owned and in commercial use, operating as a restaurant in recent years. Interior access depends on the current tenant's business hours and is not a heritage opening. The exterior can be viewed and photographed from the street at any time.
- How do I reach the Kawamoku Headquarters Office Building (former Rokkenmachi Post Office)?
- It stands at Tamachi 5-1 in Kawagoe, two to four minutes north on foot from Kawagoeshi Station on the Tōbu Tōjō Line. Hon-Kawagoe Station on the Seibu Shinjuku Line is about seven minutes away, and Kawagoe Station roughly twenty.
- Who designed the Kawamoku Headquarters Office Building (former Rokkenmachi Post Office)?
- Mori Tomekichi, a builder from the local area, handled both design and construction. The national register names him directly, which is comparatively unusual for a small provincial building of this period and indicates the work was recognised as his.
- Why does the Kawamoku Headquarters Office Building have a tower-like roof?
- The site is a corner lot, and the design emphasises that condition by pushing the eaves upward at the angle so the roof reads as a small tower, with the corner face projecting through both floors. The Agency for Cultural Affairs identifies this treatment as the building's distinguishing feature.
- What else is worth seeing near the Kawamoku Headquarters Office Building?
- Tandoku Garden stands directly opposite, with a detached wing of 1901 and a dry landscape garden opened to the public in 2018. Kawagoe's kurazukuri merchant streets are about ten to fifteen minutes further on foot.
Basic Information
| Name | Kawamoku Headquarters Office Building, formerly Rokkenmachi Post Office (カワモク本部事務所棟（旧六軒町郵便局）) |
|---|---|
| Location | Tamachi 5-1, Kawagoe City, Saitama Prefecture |
| Designation | Registered Tangible Cultural Property (Structure), registration no. 11-0004 |
| Year Designated | Registered 12 December 1997; public notice 8 January 1998 |
| Quantity | 1 building |
| Dimensions | Two-storey timber construction, sheet-metal roof, building area 81 m²; built 1927, works around 1937 |
| Owner | Private |
| Public Access | In commercial use; interior access subject to the current tenant. Exterior visible from the public street |
References
- National Database of Designated Cultural Properties, Agency for Cultural Affairs — Kawamoku Headquarters Office Building
- https://kunishitei.bunka.go.jp/heritage/detail/101/00000386
- Cultural Heritage Online — Kawamoku Headquarters Office Building (former Rokkenmachi Post Office)
- https://online.bunka.go.jp/heritages/detail/176606
- Kawagoe City — Cultural Property Counts, Appendix (PDF)
- https://www.city.kawagoe.saitama.jp/_res/projects/default_project/_page_/001/010/672/kannmatsu9-07.pdf
- Kawagoe City Location Library — Tandoku Garden
- https://www.city.kawagoe.saitama.jp/locationlibrary/location/098.html
- Tandoku Garden (official site)
- https://tantoku.jp/
Last verified: 2026.08.09