The project is a portable property sales center located in West Coast New Area, Qingdao. It faces severely restricted land use conditions. The design improved the adaptability of the modular building by customizing and upgrading the multi-functional modules. Several large metal boxes were built side by side above water, which generates a magnificent visual effect. The flexible combinations give the detachable building more formal and functional possibilities, so as to cater to various styles and needs of different architectural types.