Abstract. The Land Administration System (LAS) is of strategic importance to any country. Effective modern LAS should facilitate land management as an important instrument for the implementation of land policy contributing to comprehensive and sustainable land governance. The infrastructure needed to support increasingly complex requirements or urban space management based on three-dimensional register of rights would bring substantial improvement, especially for management of complex 3D situations. Modern cities are increasingly deploying different types of infrastructure under/on/above ground. The Republic of Croatia decided to establish the Register of Buildings, a transitional register combining data about buildings from existing registers towards the 3D cadastre. The transformation from 2D to 3D LAS should follow international standards, firstly the Land Administration Domain Model (LADM): ISO 19152:2012 but also other ISO and OGC standards. This study analyses the possible re-use of cadastral 3D datasets in smart urban governance procedures, the case of public purpose property valuation. To our opinion the establishment of a 3D LAS should facilitate and enable efficient and sustainable management of urban spaces.The prototype of 3D LAS, based on LADM conceptual model and its extensions, should enable efficient integration of 3D ownership rights register with the data from other domains - other key registers, taxation, and valuation data (property market data) and other sources of linked data. In this paper, the case study is used to assess the current practice of registration of buildings and their particular parts and analyse the differences between different implementation of 3D partitioned parts.