This report describes variation of long-term dynamic characteristics of a super-high-rise RC building constructed in Osaka plain. This building is equipped with the simultaneous earthquake observation system at pile tip, ground surface along with upper building. Seismic records have been obtained for more than 30 years including the 1995 Kobe earthquake. Natural period of the building became longer during the 1995 Kobe earthquake. On the other hand, swaying and rocking ratios to the top displacement estimated from those records are not variated through long-term observation.
