The integration of data deriving from various kinds of sources is a fundamental issue for obtaining complete up-to-date and detailed city models for in-depth analysing the city, visualizing it ant supporting any kind of application. Prior in such integration is the integration of 3D city models, representing the urban environment in a multi-dimensional model, with data derived by construction design and management, as Building Information Models. A methodology for achieving the smart integration of these, and potentially other, source of data, through open standards and purposely developed tools, is being realised during this project. The results support city analysis, from the cooperation with researchers dealing with urban topics and interested stakeholders and end-users, collaborating within the network of the Amsterdam Institute for Advanced Metropolitan Solutions (AMS).