Complex property structures have led to the demand for more sophisticated land administration systems. Overlapping property rights, subterranean facilities, and multi-level development can hardly be depicted in the 2D Cadastre. Implementation of 3D Cadastre is one approach toward the representation of a more realistic view of property and property rights delimitation. Two leading technologies are emerging promisingly as enabling factors for the realization of 3D Cadastre: BIM and GIS. This research intends to propose an integrated approach for the harmonization of BIM and GIS to support 3D Cadastre. This methodology entails a harmonized data model able to capture not only building-specific elements but also general land parcel information. A multistep workflow will be developed that includes data acquisition, BIM models development and fusion with cadastral GIS datasets. Validation will be done by pilot case study in urban area where complex property rights will be accurately represented in three-dimensional digital environment. This study seeks to help move the global discussion on modernization of cadastral systems with new digital tools a step further, by resolving these barriers to interoperability and providing a pathway towards integration.