BUDI (Building Urban Designs Interactively) is an integrated 3D visualization and remote collaboration platform for complex urban design tasks. Users with different backgrounds can remotely engage in the entire design cycle, improving the quality of the end result. In this paper, I consider the trade-offs encountered when trying to make spatial-based collaboration seamless. Specifically, I detail the multi-dimensional data visualization and interaction the platform provides, and outline how users can interact with and analyze various aspects of urban design. In $BUDI$, the display and interactive environment was designed to seamlessly expand beyond a traditional two-dimensional surface into a fully immersive three-dimensional space. Clients on various devices connect with servers for different functionalities tailored for different user groups. A demonstration with a local urban planning use-case shows the costs and benefits of $BUDI$ as a spatial-based collaborative platform. A performance evaluation with remote collaboration shows how the platform can meet the requirements for real-time and seamless collaboration. / Graduate