This area is very close to the core functions of Japan, with many institutions that represent Japan such as the Imperial Palace and government agencies, the Diet Building, the Supreme Court of Japan, the National Theatre, etc., and halls of various organizations, international hotels, etc. located in the neighborhood. The project will develop open public spaces within the site and will create a mixed-use facility that offers office space of the highest standard and superior residences and thus realizes our philosophy of work and living spaces in close proximity to each other.
Offices: 2nd floor to 13th floor
- Office entrance
Each floor has 1,550m2 of column-free space, and a ceiling height of 2.8m and free access raised flooring 10cm high, both top class for an office building, creating an office space with a sense of openness.
Residences: 14th floor to 23rd floor
- Residence lobby
The residences are located on the upper floors of the building in the heart of the city and boast stunning views. There is a lounge service on the rooftop and a variety of other services available for residents, helping them to enjoy living in the heart of the city to the fullest.
Access by Train
- Tokyo metro Yurakucho Line, Hanzomon Line, Namboku Line Nagatacho station 1min. (No.4 Exit)
- Tokyo metro Ginza Line, Marunouchi Line Akasaka-mitsuke station 6min. (No.7 Exit)
Concepts
Through this category 1 urban redevelopment project we will reorganize this urban zone and combine the small, uneven plots of land to use them in an integrated way. This approach will enable us to solve the problem related to the use of the land, namely that a subway line runs across the site directly underneath it, and promote rational, sound, intensive and effective use of the land and the renewal of city functions.
By eliminating the elevation difference within the site and developing public open spaces, we will make the site a place suitable for temporary refuge at times of disasters and a place in which the residents of the area can relax.
We are building separate access routes for each use of the facility, utilizing the elevation difference of the site.
There are offices on the lower floors, residences on the higher floors, and a rooftop garden with a wonderful view on the rooftop.
The redevelopment building is created using the mega-beam construction method. The most important feature of the structural plan is that it ensures the safety of the shield of the subway Hanzomon Line directly under the building. To this end we decided on a structure in which the building load directly above the shield is at first borne by the highly rigid beams (mega-beams) crossing the shield, and then transmitted to the foundation by the stakes built into both sides of the shield. Moreover, we used mat slab type footing beams to keep their thickness down to 4.5 meters. We did this to make the vertical separating distance to the subway shield as long as possible and to allow for the impact of the building and the shield on each other.
There is a rooftop garden on the top floor. It offers a place to relax to the residents and office workers.
History of the Development
| Development Time Line | |
|---|---|
| 2003 | Establishment of the Hirakawacho 2-chome Urban Redevelopment Preparation Association |
| 2006 | City plan decided (area plan, intensive land use area, category 1 urban redevelopment project) |
| 2007 | Selection of agents assigned specific tasks (design and construction) |
| 2007 | Establishment of the Redevelopment Association of Hirakawacho 2-chome East Area South District approved |
| 2007 | “Ownership transfer plan” approved |
| 2007 | Construction started |
| 2009 | Construction to be completed |
Data Sheet
| Overview of Plan | |
|---|---|
| Location | Hirakawacho 2-chome, Chiyoda-ku, Tokyo |
| Size of site | 5,592m2 |
| Uses | Offices (2nd - 13th floors) Residences (122 residences on the 14th - 23rd floors) Shops (1st floor) |
| Construction started | August 2007 |
| Construction to be completed | December 2009 |
| Overview of Building | |
|---|---|
| Building name | Hirakawacho Mori Tower |
| Total floor area | approximately 51,800m2 |
| Floors | Above ground: 24 / Basement levels: 2 |
| Structure | S, SRC |
| Design | Taisei Corporation |
