In 1951 Peter J. Koch founded the company PETER J. KOCH IMMOBILIEN, which was the basis for more than 50 years of successful real estate developments in the Nuremberg region and beyond. In 1961 he expanded his activities and became a founding partner of the Hermes Bau construction company. 

In 1978 his son, Volker Koch, founded the Renta Group Nuremberg together with partners. The Renta Group successfully developed a great number of projects for over 20 years.

 In 1999 the Koch family pooled all activities and holdings under the KOCHINVEST group.