RM Partners Acquires Iwahana Building in Kameido, Tokyo

In April 2025, RM Partners Co., Ltd. (headquartered in Shinjuku-ku, Tokyo) acquired the “Iwahana Building,” located in Kameido, Koto-ku, Tokyo, from TAC Corporation (based in Osaka-shi, Osaka).

The property is a 3-minute walk from Kameido Station on the JR Sobu Line and Tobu Kameido Line, and 8 minutes from Nishi-Ojima Station on the Toei Shinjuku Line, offering excellent commuter access to central Tokyo. Completed in 1991, the steel-reinforced concrete structure rises 9 stories above ground with a gross floor area of approximately 414 tsubo (approx. 13,700 sq. ft.). The building is configured for mixed-use, accommodating retail, office, and residential functions.

RM Partners specializes in the acquisition, management, and development of small- to mid-sized office and retail buildings, while also providing consulting services on asset management, inheritance, and insurance agency operations. In recent years, the company has been actively acquiring office properties in central Tokyo. Given its high visibility and strong accessibility, the Iwahana Building is seen as a value-add opportunity with upside potential in income performance, drawing attention to post-acquisition developments.

Key Facts

• Property Name: Iwahana Building

• Buyer: RM Partners Co., Ltd.

• Seller: TAC Corporation

• Transaction Price: Undisclosed

• Location: 1-32-8 Kameido, Koto-ku, Tokyo

• Nearest Stations: 3-minute walk from Kameido Station (JR Sobu Line, Tobu Kameido Line) / 8-minute walk from Nishi-Ojima Station (Toei Shinjuku Line)

• Completion: April 1991

• Number of Floors: 9F

• Gross Floor Area: approx. 414 tsubo (approx. 13,700 sq. ft.)