The RealEstate2.0 project aims to open the Greek real estate market worldwide, in the following ways: (a) by providing a generic infrastructure for harvesting, extracting, aggregating and curating contextual information related to RE properties from administrative, touristic or social media sites (e.g., discussion forums, social networking sites), which allows us to reduce the cost of acquiring and maintaining high quality location data over time3; (b) by elaborating advanced business models for real-estate agencies to manage their portfolio based on past property value evolution and location-related indices as well as for individuals to explore spatio-temporal trajectories of the areas surrounding the properties or points of interest, in order to assert positive and negative externalities of properties. Based on the above, a series of value-added RE e-services will be implemented using state-of-the-art Web 2.0 technologies such as mashups.