The Reception Wing of a Shipping Fortune
The Tozanso Annex (東山荘別館, Tōzansō Bekkan) is a single-story wooden reception building in Kasugacho, Atami City, Shizuoka Prefecture, completed in 1940 and added to the national register as a Registered Tangible Cultural Property (structure) on August 1, 2016. It stands at the southwestern corner of the Tozanso grounds, above Sagami Bay.
Its patron was Yamashita Kamesaburo, first president of the Yamashita Kisen shipping company. Having bought the villa in 1939 from the banker Ishii Kengo, Yamashita commissioned two further buildings the following year, this annex and a tea house, again from the contractor Shimizu-gumi. The Tozanso Preservation Society describes the annex as the place he built for mixing with figures from politics and business, and for receiving guests of state.
The building's purpose shifted after 1944, when Okada Mokichi, founder of the Church of World Messianity, acquired the estate. The church's own account records that Okada lived mainly in the main house and used the Tozanso Annex for meeting followers and writing essays, occasionally showing films there to the people who worked with him. Two room names still in use, the Room of Audience and the Room of Light, come from those years.
Why It Was Registered
Registration number 22-0226 was issued under the criterion of being a model of design. Only three of the seven buildings on the site were registered on that ground: this annex, the detached wing and the tea house. The main house, main gate, storehouse and storage shed were entered instead for their contribution to the historic landscape.
Prewar Atami had many villa reception rooms of this kind, built for entertaining. Few survive as complete interiors. The Tozanso Annex keeps its fittings and its alcove treatment largely as first made, which makes it a concrete record of the setting in which one of the shipping magnates of the 1910s and 1920s received his visitors.
Reading the Rooms
The building covers 152 square meters under a tiled roof with copper over part of it. The Zashiki rooms are set along the seaward east side in a staggered line, with a corridor running behind them to the west. Staggering the rooms rather than aligning them means the view from each one reaches the water without the next room getting in the way.
The principal room measures thirteen mats. Its alcove, about two mats wide, is a fumikomi-doko: no framing beam at the front, the floor lifted only slightly above the tatami and finished in a mix of wiped board and matting. The Agency for Cultural Affairs describes the treatment as being in the zangetsu manner. As Tokonoma go, this is a restrained one.
North of that room lies an earth-floored veranda paved with roof tiles laid on the diagonal, at forty-five degrees to the walls. It belongs more to the garden than to the house.
The overall idiom is Sukiya-zukuri, but the beams are worked in the taiko-hatsuri method, adzed flat on two opposing faces so that the log keeps its curve on the others. Refined alcove joinery and rough bark-line timber share the same room. That pairing is what gives the Tozanso Annex its particular character.
Visiting
Entry to the Tozanso Annex comes as part of the guided circuit of the whole property, arranged in advance through the preservation society. The days are Sundays, the third of the month as a rule and the fourth in March, May, August and November. For 2026, July and December carry no dates at all.
Groups leave twice, at 11:00 a.m. and 1:30 p.m., and no more than ten join each one. Visitors hand over 1,000 yen at the desk and follow a guide around the property for an hour or so. Reservations are made by email, stating name, contact details, the date and time preferred, and the size of the party, and are taken in the order they arrive.
Camera rules do not appear in any published notice. Raise the question with the guide on arrival.
JR Atami Station lies about ten minutes away, the walk running southeast and uphill. Cars have nowhere to go on the property, leaving the paid car parks in town. This building occupies the far southwestern corner, so getting to it means cutting across the garden from the gate.
Q&A
- Can I go inside the Tozanso Annex, and what does it cost?
- Yes, as part of the guided circuit of the property, which has to be arranged beforehand. Sundays only: the third of the month as a rule, the fourth in March, May, August and November. Groups leave at 11:00 a.m. and 1:30 p.m. with no more than ten in each, the charge is 1,000 yen, and the circuit runs an hour or so. July and December carry no dates in 2026.
- Who built the Tozanso Annex and what was it for?
- The shipping owner Yamashita Kamesaburo added it in 1940 as a reception wing for entertaining political and business figures and official guests. Okada Mokichi later used it to meet followers and to write.
- What is the zangetsu-style alcove in the Tozanso Annex?
- It is the two-mat alcove in the thirteen-mat principal room. There is no framing beam across the front, and the floor is raised only slightly above the tatami, combining wiped board and matting. The Agency for Cultural Affairs records this as being in the zangetsu manner.
- How big is the Tozanso Annex and how is it built?
- It is a single-story wooden building of 152 square meters, roofed in tile with copper sheeting over part of it, with staggered tatami rooms on the east side and a corridor along the west.
- When did the Tozanso Annex become a Registered Tangible Cultural Property?
- On August 1, 2016, under registration number 22-0226 and the criterion of being a model of design. All seven buildings on the site were registered the same day.
Basic Information
| Name | Tozanso Annex |
|---|---|
| Location | 1712-1 Kasugacho, Atami City, Shizuoka Prefecture |
| Designation | Registered Tangible Cultural Property (Structure) |
| Year Designated | Registered on August 1, 2016 (Heisei 28) |
| Quantity | 1 building |
| Dimensions | Single-story wooden structure, tiled roof partly clad in copper sheet, building area 152 square meters |
| Owner | Church of World Messianity |
| Public Access | Open by advance reservation (3rd Sunday of most months, admission 1,000 yen) |
References
- National Designated Cultural Property Database, Tozanso Annex (Agency for Cultural Affairs)
- https://kunishitei.bunka.go.jp/heritage/detail/101/00011141
- Tozanso, About the Buildings (Tozanso Preservation Society)
- https://touzansou.jp/about
- Tozanso, Visit Booking (Tozanso Preservation Society)
- https://touzansou.jp/application
- Cultural Properties (Church of World Messianity)
- https://sekaikyuuseikyou.or.jp/culture
Last verified: 2026.09.09