On December 8, NTT Urban Development and TEPCO Power Grid announced the official start of construction for the NTT Hibiya Tower. The 48-story high-rise is part of a large block development that will see three buildings redeveloped, including the Imperial Hotel next-door, by 2037 or later. Each of the three buildings are expected to include a hotel component.
The NTT Hibiya Tower is located in the center of the development site. The 230-meter tall tower will have a GFA of 361,000 square meters. Office will take up floors 11 to 42, with NTT expected to move its Otemachi head office to the building in 2031. The site was previously home to NTT’s headquarters from 1961 to 1995.
The standard office plate will be 1,600 tsubo (5,289 square meters) with the flexibility to split floors up into seven tenant spaces. Floors 44 to 48 will have a 100-room small luxury hotel to be operated by the Imperial Hotel with two banquet halls to be located on the 6th floor.
As a nod to its historic past, the NTT building and its neighbor on the southern side will share a 31-meter tall podium along the Hibiya Street side, continuing the 31-meter skyline that had been in place since the Meiji era. Although those 31 meter building height limits were removed in the 1960s, several developers along this stretch have chosen to continue the design to create a cohesive streetscape.
Completion is scheduled for October 2031.
Sources:
The Asahi Shimbun, December 8, 2025.
NTT Urban Development News Release, December 8, 2025.