This e-book is based on a selection of papers from one of the major topics at the CIB W070 2006 Trondheim International Symposium - 'changing user demands on buildings: needs for lifecycle planning and management'. The challenge for facilities managers today is to effectively manage the great economical value our built assets represent, as well as focusing on efficient use and operation of facilities over time. Users' and tenants' needs are more and more in focus. The selected papers focus on meeting changing user demands through adaptability in the long-term perspective. Research and case studies are presented, exploring the needs and possibilities for modernization, transformation and reuse of existing buildings, infrastructure and urban renewal areas. Transformation and reuse are also seen in relation to conservation of historic buildings.