Collaborative work in architecture is commonly concentrated on the design process. Design teams and their members are working together on multiple virtual model from different, mostly remote locations. Internetbased collaboration software offers a project management platform for comprehensive networking. Complex projects can be better coordinated and documented,and executed even faster. So in the building process at least two different kinds of collaboration can be noticed, collaboration in the design process where the architects are maintaining their modeling informations, and the construction process where the data is maintained be external software companies. Here another model is suggested. Hosting project data in their own building and so maintaining the physical representations of all project informations is the only way retaining control. keywords: Collaborative Design, Communication, Database Systems