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Central Government Building No.3
Central Government Building No.3
Traditionally, the central Sakurada Street has been the "main street" of the Kasumigaseki district. However, with increases in the number and scale of office buildings, Building No.3 and most of the buildings constructed subsequently have been built facing streets other than Sakurada Street. The plan for Building No.3 called for basement level 2 up to floor 7 to be built in phase I and floors 8 through 11 to be built in phase II.

The construction site faced onto roads on the National Diet Building side and the Ministry of Foreign Affairs side, both of which were sloping. The question arose as to which side would be the building's main entrance. Considering the likely approach of people coming to the building, the decision was made based on the flow from nearby public transportation and on the concept of separating pedestrians and cars. Thus it was decided that the Ministry of Foreign Affairs side would be the entrance for pedestrians, while the National Diet Building side would be the main entrance and the approach for automobiles.


The basic footprint of the building was designed to be a simple rectangle. To determine the spacing of the pillars, the layout of desks in offices was considered, as well as the dimensions of private offices and the most effective use of materials, and 1.2 m was set as the basic module dimension.
This meant that the space between the pillars would be 8.4 m in the ridge direction and 7.2 m in the span direction using a balanced rigid frame. These dimensions were determined based on the expectation that the 8.4 m space in the ridge direction could be divided into two for private offices.

Typical floor plan of Central Government Building No.3

The typical floor plan is point-symmetrical rather than perfectly left-right symmetrical. To make the most of the dimensions in the ridge and span directions, the earthquake resistant walls are arranged around the building's core. The private offices and meeting rooms, with a greater number of partition walls, are located near the earthquake resistant walls, while the general offices are designed to be large open rooms with as few partitions as possible. The twelve elevators are concentrated in the center of the building so as to be near both approaches.

Phase I of the construction began in August 1963, and the building was constructed from basement level 2 up to floor 7. This phase was completed in June 1966.

Phase II began in May 1971, and the remaining floors 8 - 11 were constructed. The building was completed in August 1973. Phases I and II were completed roughly ten years from the initial planning of the building, and the finished building looked as it does today.

From December 2000 through December 2002, the building was renovated to improve its earthquake resistance, in one of the largest-scale seismic base isolation projects ever undertaken in Japan.

Computer graphics perspective
   Computer graphics perspective

Building Data
Building name: Central Government Building No.3
Structure: reinforced concrete
Number of floors: 11 floors, 2 basement levels
Building area: 7,280 m2
Total floor area: 69,581 m2
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