Tanseisha Acquires Office Building in Nihonbashi-Hamacho
Tanseisha acquired Prime Nihonbashi, an office building in Nihonbashi-Hamacho, Chuo Ward, Tokyo, in March 2026. The seller was Horaio, a company headquartered in Mita, Minato Ward. Horaio had acquired the property from Tosei in March 2021 and sold it after roughly five years of ownership.
Completed in 1992, the seven-story building has a typical floor plate of approximately 29 tsubo (approx. 1,000 sq. ft.). It is a seven-minute walk from Hamacho Station on the Toei Shinjuku Line and a 10-minute walk from Suitengumae Station on the Tokyo Metro Hanzomon Line.
The vacancy rate for office buildings within a five-minute walk of Hamacho Station with typical floor plates of less than 50 tsubo (approx. 1,800 sq. ft.) has been trending lower since the second half of 2024 and stood at about 2.2% as of July 2026, indicating tight supply and demand (compiled by the editorial team based on estie office research).
Founded in 1946, Tanseisha is a Tokyo Stock Exchange Prime Market-listed company that designs and builds spaces for retail facilities, cultural facilities and offices. It also runs an R2 (Real-estate Revitalization) business that acquires and repositions small and midsize buildings in central Tokyo. In the Higashi-Nihonbashi area, it acquired Higashi-Nihonbashi ST Building in 2022 and S-CUBE Building in 2024, continuing a run of small and midsize office acquisitions in central Tokyo.
Key Facts
- Property Name: Prime Nihonbashi
- Buyer: TANSEISHA CO., LTD.
- Seller: Horaio Co., Ltd.
- Acquisition Date: March 23, 2026
- Location: 3-35-6 Nihonbashi-Hamacho, Chuo-ku, Tokyo
- Nearest Station(s): Seven-minute walk from Hamacho Station on the Toei Shinjuku Line / 10-minute walk from Suitengumae Station on the Tokyo Metro Hanzomon Line
- Completion: October 1992
- Number of Floors: 7F (steel-reinforced concrete construction)
- Area: Typical floor plate of approximately 29 tsubo (approx. 1,000 sq. ft.) / Gross Floor Area of approximately 171 tsubo (approx. 6,100 sq. ft.)
