Controlling is an upcoming idea in Real Estate Management. Up to now a comprehensive concept of Real Estate controlling is missing. This paper shows an revolutionary idea based on controlling determinants and the management ratio pyramid. (See power point presentation) Two aspects define the situation: On the one hand a lot of data is generated, especially via new technology (eg hi-tech house, fieldbus). All this information has to be analysed and worked with. On the other hand stakeholders (mainly owner, investor, occupant, facility services) need accurate data and management information for decision making as well as operating doing. On the ERES-conference in Weimar the authors want to present their concept and illustrate the idea. We are looking forward to an interesting discussion.