This building in Shinjuku was completed in 2000. It has a rather spooky look which I really like. It houses quite a bit of networking hardware for Japan's largest telecommunications carrier NTT. Apparently it employs a great deal of environmentally friendly technology, it uses solar power to conserve evergy, a nitrogen based fire extinquisher system, waste water is recycled and rainwater is used for toilet flushing. In addition, lights on the top of the building supposedly indicate if it's desirable to carry an umbrella. When the clock was put into operation in 2002 it became the world's tallest clock tower at 240m (787ft).