Tokyo Metabolizing

Here is a movie clip from the Japanese pavillion exhibition in Venice 2010, which shows the metabolizing process in a Tokyo neighbourhood. The lifetime of buildings in Tokyo is relatively low (about 20-30 years), and it is likeley that a whole neighbourhood will be replaced during a generation (30 years). I am trying to do some more exact research about the lifespan of buildings in inner Tokyo, as this is a very important factor when designing the frames for a future city.

http://www.youtube.com/watch?v=LbhCcXhc_vk