Real estate consultant. German/Hamburg property, Feasibility studies, German property buyers guide, Planning consultants, Valuations, Architectural advice, Architect/Engineer, Appraisals, Design and build: Gerhard Bolten is located in Hamburg, Germany on Alsterufer 20 B. Real estate consultant. German/Hamburg property, Feasibility studies, German property buyers guide, Planning consultants, Valuations, Architectural advice, Architect/Engineer, Appraisals, Design and build: Gerhard Bolten is rated 3 out of 5 in the category real estate appraiser in Germany.