Design competitions are introduced into many building types for selecting ideas and plans to realize good quality of these facilities. However, it is seldom evaluated strictly on actual conditions after the competition or the prize. This paper aims to review the competition process for Iwamizawa compound station building with the prize of AIJ 2010, and analyze spatial characteristics based on the actual conditions of using the complex building. Many activities are observed same as expected cases in the competition. On the other hand, the main hall where is important space in the design concept makes some conflicts on persons' usage because of occupations by particular types of utilization.