Here is what I quickly found on the internet about this: If the property is sold within one year before or after the valuation date, the purchase price achieved for the property is used as the value for the calculation of inheritance tax. (Only applies to sales to third parties). In a similar case, where an appraisal and a timely sale of the property were present, the purchase price was used to calculate the inheritance tax (Financial Court Berlin-Brandenburg, judgment of 15.09.2010 – 3 K 3232/07).