||The paper describes and gives example on how Information and Communication, ICT, can and will en-hance and support the building functional systems defined from client and end-user needs and requirements. The build-ing systems may be derived from functional requirements on buildings such as usability and security on highest level with sub-systems definitions on lever levels. Building functional sub-systems may be defined for user comfort, indoor-climate, evacuation, space configuration, aesthetics, O&M etc. These building systems are supported by Information and Communication Technology, ICT, and building component systems that are accessed and integrated in the real world of building use in different contexts. The ICT systems may be physically or virtually embedded in the building. Already in 1982 AT&T established the 'intelligent buildings', IB, concept due to marketing reasons and the Informart building was established in Dallas as a showplace for IB installations. The interest in IB has fluctuated since then. There may be a fruitful interaction between user needs pull and ICT break-through push for creative and innovative development of ICT enhanced buildings. The paper explains the Intelligent Building concept with focus on virtual build-ing models support, new services and user environment definitions and development, virtual spaces and augmented reality, intelligent building components, application ontologies, and ICT systems integration to illustrate ICT enhanced buildings potentials and R&D needs.