Former Kosei Kaikan

A soy-sauce family's gift to the workers of Chōshi

In Chōshi, the fishing city at the far eastern tip of the Kantō plain, a square reinforced-concrete building stands a short walk inland from the harbour. It opened on 12 April 1926 as the Kōsei Kaikan, a hall built for adult education with the private money of one man: the tenth head of the Hamaguchi house, the family that has run Yamasa, one of Japan's oldest soy-sauce makers, since the seventeenth century.

The previous year he had set up a foundation, the Kōsei-kai, to carry out social-education work for the townspeople and for Yamasa's own employees. The hall was its base. Inside ran a night middle school called Kōsei Gakuin, for young people who worked by day, and a public reading room, the Kōsei Library. The large second-floor auditorium hosted lectures, ceremonies, and film screenings, at a time when the moving image was still a novelty in a provincial town.

In 1948 the foundation was dissolved and the whole property was handed to the city of Chōshi. The building has worn several names since, and today it serves as the Chōshi Central District Community Center, with meeting rooms and the old auditorium still open for public use. A bronze bust of its founder stands outside.

Registered, not designated: what the status means

The former Kōsei Kaikan became a Registered Tangible Cultural Property on 31 October 2022, carrying registration number 12-0318. The wording matters. Japan protects its built heritage through two separate systems. The older one, "designation," covers Important Cultural Properties and National Treasures and applies strict controls; it tends to single out temples, castles, and the most exceptional historic structures. The second, "registration," was introduced in 1996 for buildings roughly fifty years or older. It is a lighter touch, meant to keep comparatively recent architecture in active use while encouraging owners to preserve its character. Most early-modern concrete and brick buildings around the country fall under this newer category.

The Agency for Cultural Affairs registered the hall under the criterion that it serves as a model of its type. Two things earned it that judgement. First, the design: the entrance is dressed in the Secession manner then fashionable in Europe and newly arrived in Japan, with paired columns and a strong vertical emphasis that carries a memory of classical order into a modern idiom. Second, the structure itself. For a regional city to put up a two-storey reinforced-concrete building in 1926 was early, and this is thought to be the oldest surviving concrete building in Chōshi.

What to look for at the door and inside

Start at the front. The entrance bay is where the architect spent his decoration, and it rewards a slow look. The columns flanking the door are not quite classical and not quite modern; they belong to the Vienna Secession taste of the 1900s and 1910s, geometric and upright, with restrained ornament. The whole face of the building pulls the eye upward. Step back across the small bridge in front and the verticality becomes the point.

The cleverest detail sits indoors. Above the entrance into the second-floor auditorium, a small projection room juts out into the hall, cantilevered over the doorway so that a projectionist could throw film across the room to a screen at the far end. It is a practical reminder of what social education looked like in the 1920s, when a lantern slide or a reel of film was a way to reach an audience that could not all read.

One more thing gives the building its weight. Chōshi was heavily bombed in the closing months of the war, and much of the old town centre burned. The Kōsei Kaikan came through. Standing in front of concrete that survived the raids, you are looking at one of the few pre-war landmarks the city still has from this district.

Making a day of it in Chōshi

Chōshi rewards a visitor who likes flavour and salt air. The town's wealth was built on soy sauce, and both of its great makers welcome guests: Yamasa runs a tasting and experience hall near its works, and the rival house of Higeta keeps a small museum of its own history. Seeing where the money for the Kōsei Kaikan came from, then seeing the hall, ties the two halves of the story together.

Out at the cape, Inubōsaki Lighthouse has marked the easternmost point of the Kantō region since 1874, a tall brick tower raised under the guidance of the British engineer Richard Henry Brunton. The fishing port, among the largest by catch in Japan, is worth an early-morning look, and the much-loved Chōshi Electric Railway rattles out toward the coast for those who would rather ride than walk. Closer to the hall, the Iinuma Kannon temple and a scatter of other registered buildings, including the Ishigami sake brewery, fill out an afternoon on foot.