There are a great number of current web accessible city models, that take a variety of approaches to representing the 2D, 3D and associated graphical information that they embody. The work described here represents a stage in the development of an urban modelling approach that we intend will lead to cost effective and computationally efficient systems for such systems. Our aim is to contribute to the range of approaches being adopted by different research and development groups, across the world, and particularly within Europe.