An important tool in strategic decision-making for the existing building stock of housing corporations are Real Estate Portfolio Management Systems (REPM). REPMs are used to systematically plan, direct and control building stock. Their primary aim is to improve the corporationÌs effectiveness and efficiency. Models have been developed to implement the portfolio selection method (originally developed by Markovitz). These are based on a description and assessment of economic factors. Housing corporations must contribute to sustainable management and develop respective policy guidelines. In support of this process the authors recommend possible approaches for suitable tools. Approaches derive from the portfolio analysis and include, apart from redirecting the economic specifics of the housing sector, non-monetary criteria oriented along the economic dimension of sustainability (e.g. energy standard, CO_ emissions). Apart from Ïgreeningó, another important aspect is the dynamic character of this appraisal method. The originally static portfolio approach is extended by including possible future developments of portfolio indicators. The implication of developments on the corporationÌs cash flow and consequentially on the corporate value are integrated. As a result future trends in building stock and corporate development can be simulated Ò thus supporting the decision-making process for an economic, environmental and socially compatible strategy for building stocks (the principles of the ÏTriple Bottom Lineó).