City of Mostar Regional Education and Information Centre for sustainable development in South East Europe (REIC) Institute of Urban and Regional Development Habitat Macedonia Nadacia Habitat for Humanity International Habitat for Humanity Bulgaria German society for solar energy section Berlin Brandenburg Free and Hanseatic City of Hamburg – Ministry of Environment and Energy; General Directorate of Nature Conservation, Landscape Architecture & Energy Division; NGE1 Landscape Planning and Urban Green Hungary Green Building Council (HuGBC) Polish Green Building Council (PLGBC)