The new headquarters of CAT Telecom consists of many functional requirements which make it require huge footprint area. Instead of creating a huge building, we decided to break it into 3 buildings, an auditorium building, a parking building, and an office building which arranged by approaching of users. The building alignment also follows the existing master plan which is diagonal grid creating a triangle court in the middle of them act like a gathering place for all and for more benefit on other physical reason such as to gain natural light in the building. The separating of three big buildings also helps to separate users and traffic circulation clearly. The main concept design of this project is to put the roof scape like a continuing slope gradually rising from the auditorium building to the office building make all masses not too dense from the approach view. The shape also shows "the growth" of the organization which keeps moving to the future continuously.