Sumitomo Corp. Acquires Office Building in Chiyoda-ku's Hirakawacho

Sumitomo Corp. acquired U Square Hirakawacho, an office property in Hirakawacho 2-chome, Chiyoda-ku, Tokyo, in February 2026. The seller was OMS LLC, which had acquired the property from A.D.Works in February 2023, making this a sale roughly three years later.

Completed in 1984, the building rises eight floors above ground with one basement level and has a typical floor plate of approximately 39 tsubo (approx. 1,400 sq. ft.). A renovation was completed in December 2014. The property is a four-minute walk from Hanzomon Station and a five-minute walk from Nagatacho Station.

The vacancy rate for office buildings of all grades in Hirakawacho, Chiyoda-ku, hovered around 5% during 2024 before declining from 2025 onward, standing at approximately 1.8% as of July 2026 (compiled by the editorial team based on estie office research). New office supply has also appeared in Hirakawacho 2-chome, where owns Hirakawacho, the first property under NTT Urban Development's new office brand owns, was completed in September 2024.

Sumitomo Corp. positions the Kojimachi area as one of the strategic focus areas of its office building business and has rolled out PREX, its mid-size office brand. In April 2025 it acquired JP-BASE Hirakawacho in Hirakawacho 1-chome, and in March 2026 it completed a renovation converting the property to its own office brand, WORK VILLA HIRAKAWACHO. In July 2026 it also acquired the nearby Ichigo Hanzomon Building, adding to a run of acquisitions around Hirakawacho and Hanzomon.(see related article:Ichigo Office REIT To Sell Four Central Tokyo Office Properties to Sumitomo Corp. for JPY 14.22 Billion)

Key Facts

• Property Name: U Square Hirakawacho
• Buyer: Sumitomo Corporation
• Seller: OMS LLC
• Acquisition Date: February 5, 2026
• Location: 2-11-2 Hirakawacho, Chiyoda-ku, Tokyo
• Nearest Station(s): Four-minute walk from Hanzomon Station on the Tokyo Metro Hanzomon Line / Five-minute walk from Nagatacho Station on the Tokyo Metro Yurakucho, Hanzomon and Namboku lines / Eight-minute walk from Kojimachi Station on the Tokyo Metro Yurakucho Line
• Completion: October 1984
• Number of Floors: 8F / B1 (steel-reinforced concrete construction)
• Use: Office / Retail / Parking garage
• Area: Typical floor plate of approximately 39 tsubo (approx. 1,400 sq. ft.) / Registered floor area of approximately 356 tsubo (approx. 12,700 sq. ft.)