Japan has more than 270 high-rise buildings above 150 metres (492 ft). Unlike other Asian countries with skyscrapers exceeding 400 metres (1312 ft) in height, Japan's skyscrapers are relatively shorter. Construction is difficult due to the high cost of labor and construction material; all buildings above 50 metres (164 ft) must also be as earthquake-proof as possible and adhere to other strict structural standards.