The German firm KSP Engel and Zimmermann Architects has become a leader in innovative reconstruction and redesign of old buildings. This survey features a number of their projects throughout Germany - the refurbishing of an office tower in the heart of Frankfurt; a housing complex converted to a hotel; a state-of-the-art library that once housed a bank; and, more. Interviews with engineers, architectural historians and conservators offer a wide variety of perspectives on the value of re-use, the importance of historical preservation and the possibilities of conversion. The examples put forth in this collection include photographs and plans of each project, and create a valuable reference work for anyone interested in this vital aspect of renewable living.