The survey targeted buildings with 10,000 m2 or more of gross space for office floors.

According to the survey, the office supply in the 23 wards of Tokyo is expected to decline to 680,000 m2 in 2013 after reaching 1,620,000 m2 in 2012. The office supply in the three central wards of Tokyo (Chiyoda, Chuo and Minato) is predicted to move more stably from 880,000 m2 in 2012 to 640,000 m2 in 2013.

Meanwhile, the supply volume in wards other than these three will drastically decrease from 740,000 m2 to 40,000 m2. Mori Trust attributed the sharp decline to the slowdown in the rental office market since 2008 and the degradation of the environment for raising development capital, also predicting that supply adjustment will continue over the medium to long term in neighboring areas, where it takes longer for the market to recover.

The buildings to be completed in 2011 to 2014 in the three central wards of Tokyo are concentrated in the periphery of Tokyo Station and other areas that are already filled with large buildings.

Of the buildings to be completed from now, the rebuilding of aging buildings is expected to account for about 80% on an area basis.

After the Great East Japan Earthquake, an increasing number of building developments will involve stronger measures against disaster risk through the introduction of seismic control and seismic isolation structures, reinforced emergency power sources and enhanced disaster-prevention emergency supplies for people unable to get home in a time of disaster.

Mori Trust also pointed out that the rebuilding of aging buildings will be facilitated from now, as the superiority of new buildings compared to existing buildings will increase further.