Abstract
This is a report about the space planning of the commercial theater, which we rebuilt to mix it with office use for high use of land, in order to increase their business profit. We tried some ideas in the planning. The main level of the theater was on the third floor and the greenrooms were on the second floor to increase the flexibility of the first floor. The stage has a high flies. All the seats were within 22m from the stage. The vertical approach from the entrance to the seats wascharacterized as street, and so on. By these ideas, we planned to give the theater enough function and charm aswell as simple theaters.