The BaaS project targets the need for comprehensive and open cross-domain management and control services in today’s buildings. The problem is that these integrated management and control services are not yet available due to the separation of automation disciplines into independent control systems, e.g. for lighting control, HVAC (heating, ventilation and air-conditioning), safety and security. The trend towards smart commercial buildings demands the integration of building automation systems with ICT systems and other building related information over the complete building life cycle. This requires a novel approach towards the modelling of a building with respect to its properties and functions. The modelling will also include the utilisation of building facilities by different stakeholders like facility managers, tenants, occupants and visitors. The main goal of the BaaS project is to establish a generic service platform for commercial buildings that integrates traditional building automation and management systems with ICT infrastructures. This platform supports the development and deployment of novel valued-added services and applications that take advantage of an integrated model of novel and legacy building systems along with the data provided and consumed by them.