Ecologic sustainability assessments are of increasing importance in understanding the physical resource metabolism of urban systems. In Stockholm, the so-called Hammarby Model visualised important synergies in waste and energy flows in the Hammarby Sjöstad urban district and supported improved metabolic thinking. Following the success of this approach, the Eco-Cycle Model 2.0 for the Royal Seaport was developed in cooperation between KTH University and the City of Stockholm. The Eco-Cycle Model 2.0 can take account of more dimensions than the Hammarby Model, including overall and detailed descriptions of resource flows in a lifecycle perspective. Important starting points for the model were (1) global and local challenges concerning the use of resources, with specific relevance for urban development, (2) available models which visualise functions, resource flows, and resource synergies and (3) approaches to material, energy, and water accounting. The primary objective of the model is to show important connections and synergies between resource flows in a modern urban area. Secondary objectives that can be fulfilled in the long term are: to be a tool for the monitoring and follow-up of environmental objectives, to serve as a dynamic tool for the analysis of resource flows, and to contribute to improved urban planning.