This paper reports the development of a Spatial Decision Support System (SDSS) that is currently in the early stages of implementation and testing. The project is a joint undertaking between the University of New South Wales (UNSW) and the NSW Department of Housing (DoH). It features a robust, non-proprietary data structure incorporating 3D spatial models, use of VRML/X3D for graphics modelling and incorporating XML based data and customised tools to support effective web-based user interaction. Although the broader project aims to develop an SDSS that supports all aspects of the management of public housing for a governmental authority, this paper focuses specifically on a module to support public participation through the capture of community feedback and other input. The paper begins with an outline of the immediate context of this work, both in terms of the local community being used as the test bed for this implementation as well as comparing this work to similar undertakings in other places. It goes on to describe the unique approach taken in this project toward the structuring of the geo-spatial data that lies at the heart of the system and the tools developed to support user interaction and community participation. The paper concludes with a discussion of on-going issues encountered during the development and implementation of this system, and proposals for future developments. This paper is an extension of the work presented at the 24th Urban Data Management Symposium, in Chioggia, October 2004.