GAG Immobilien AG engages in the real estate business. It operates through the following segments: Real Estate Management, Inventory Sales, Property Development, and Central Unit. The Real Estate Management segment focuses on the management of apartments and commercial units. The Inventory Sales segment engages in the sale of apartments. The Property Development segment specializes in family homes and condominiums. The Central Unit segment comprises activities that are not directly attributable to the operating segments. The company was founded by Konrad Adenauer on March 18, 1913 and is headquartered in Cologne, Germany.