Computer Aided Facility Management (CAFM) means the support of Facility Management (FM) activities by modern information technology (IT) during the life cycle of real estate. The purpose of this paper is to describe the relevance of Computer Aided Facility Management (CAFM) as a new decision support technology in the field Real Estate Management. This provides new challenges and opportunities both to software developers and users in this field.The author illustrate the recent developments and market demands of (CA)FM decision makers. The main part will provide an overview of the basic concepts and detailed insight into the topic and how CAFM may serve as a Decision Support System (DSS) from an organizational perspective. This paper illustrates the cutting edge of CAFM and its relevance for Real Estate and Facility Management decision making. The paper provides a review of the state of the art and practical experiences of CAFM applications - presenting an analysis of current trends and technologies, and provides recommendations for a successful CAFM implementation based on a research study of successful CAFM projects in companies and public institutions. Modern CAFM software is going to develop from classical information systems into real decision support systems. First steps into this direction are shown in this paper. The paper closes with an overview of future developments, trends and research opportunities in CAFM as a decision support tool.