The paper deals with the impact of the interest rate policy of the European Central Bank on the cost of houses in Germany. The European Central Bank's interest rate policy has a significant influence on the cost of capital for consumers in connection with the banking system in Germany. Consumers obtain their foreign capital directly at the European Central Bank, consumers go for loans to their local bank. The banks borrow money from the European Central Bank or Park surpluses with her. The cost of lending by the European Central Bank on the banks is described in the base rate of the European Central Bank. The development of the federal funds' interest rate has thus the significant indirect influence on consumer credit interest rates and on the cost of capital for consumers with larger investments. This article describes the effect of the low capital cost (interest) of the European Central Bank on the impact of the price of the residential property. The report analyses the cost of capital, income, and the development of real estate prices. She will prove that of in Germany despite low-interest rates by the European Central Bank with regard to rising incomes, are not significant in the real estate price increases market. Despite low-interest rates of the European Central Bank, one can speak of a real estate bubble in Germany. Real estate has so far not led to capital flight in the form of investments. The investigations relate to statistical evaluations of the year 2008 (2010) until the end of 2017 and take account of to take into account the average price development in whole Germany. In some urban centres such as Frankfurt am Main, Berlin, Hamburg or Munich prices differ from the statistics here political missteps but are the reason for the price increases and are not included in the analysis. The investigation is very important for the planning of real and well-formulated marketing activities for all staff and decision makers in the marketing. Only if the marketing can assess the mechanisms of monetary policy, the effect of increasing or decreasing the cost of capital and the development of real estate prices, the right incentives in marketing can be used. The analysis also provides an insight into the statistical calculation of key figures. Finally, the analysis provides an Outlook for the demand for future research on the effects of borrowing costs on human behaviour. As a result, the study is also interesting for other players in the real estate market and the State institutions.