A strategic approach and holistic planning are important elements of sustainable building development. They can be supported by current technology, which, for example, can visualise and benchmark a building’s actual environmental performance. However, management of environmental building performance (EBP) through IT systems has experienced difficulties in gaining a solid base, partly due to a lack of core data on buildings, but also to erroneous consumption data and a lack of any overview of consumption patterns. This PhD dissertation shows how the implementation of certain IT systems in Real Estate Management (REM), including Facilities Management (FM), can promote sustainability by reducing REM’s negative environmental impacts. This is primarily achieved through the successful implementation of IT systems that can process large amounts of different data on buildings and their performance. However, to succeed with the