Building networks for sustainable transition of old industrial areas DOI reference: 10.1080/13673882.2021.00001093 By Carolin Schack*, Thomas Neise, David Heimann and Martin Franz , Osnabrück University, Germany This article shows possibilities of sustainable transformation of old industrial areas. Based on findings of the research project “Grey goes Green – Transformation of Industrial Areas” with case studies in Germany we showcase that network building helps to overcome major challenges and enhances sustainable transition. The project analyses and supports the formation of networks as well as partnerships between municipalities and companies to identify essential success factors for implementing sustainable development of old industrial areas. Initial situation Since the 1980s, significant efforts have been made in urban planning to realise new industrial areas that meet higher ecological standards in Germany. However,