The Public Real Estate Management (PREM) is the 4th largest Real Estate owner in Germany with 805 bill. Ä assets in properties. Even so the German PREM sector suffers from public depts, the lack of transparency in its properties (lifecycle costs, area and documentation of the build-ings), and of not having establishes relevant management instruments. Caused by finan-cial pressure, the PREM sector in Germany has started selling out a high number of valuable buildings for the last 5 years. This happened without havening installed a strategic real estate portfolio management to identify necessary and unnecessary public properties, to monitor the properties and to develop them. Portfolio management systems exist in the Corporate Real Estate (CREM) sector. They are based on the return on investment within the dimension the competitive advantage (x-coordinate) and the soft facts for market attractiveness (y-coordinate). Existing portfolio management systems use value benefit analysis, which causes subjective evaluations of the properties. During the last three years a system to evaluate and to develop public property portfolios using internal and external benchmarks has been developed at the Institute for Construction Management (IQ-Bau) at the Bergische Universit‰t Wuppertal. Its applicability has been proven by intro-ducing and using it at the police department of Berlin, Germanyís third largest public security company. Its successful implementation shows that selling public properties should only be the last opportunity to optimize the situation of Germanyís Public Real Estate Management.