3D digital city models, important for urban planning, are currently constructed from massive point clouds obtained through airborne LiDAR (Light Detection and Ranging). They are semantically enriched with information obtained from auxiliary GIS data like Cadastral data which contains information about the boundaries of properties, road networks, rivers, lakes etc. In this work we demonstrated a column-oriented SDBMS enhanced with a set of optimized operators to provide effective data skipping,efficient spatial operations,and interactive data visualization. Such features are exploited for 3D digital city models using latest topography of The Netherlands and the latest Cadastral information for The Netherlands. Through a web-interface exploiting X3D technology, the user requests 3D digital city models with predicates on the semantic attributes. The demo has been presented at ACM SIGSPATIAL 2016.