In Malaysia, cadastre system is carried out in two-dimensions (2D) and all cadastre have their own unique ID, called Unique Parcel Identifier (UPI). UPI is widely used in various land transaction purposes e.g. sale and purchase of land, land development, and so forth. Traditionally, cadastral registration system is a basic 2D land system. In the near future, 2D cadastre faces some difficulties in answering queries related to 3D complex situations such as apartments, towers, condominium, and etc, thus 3D cadastre seems most appropriate to be developed. This paper discusses the concept of determining the unique identifier code for each 3D object called Unique Features Identifier (UFI). This paper discusses the recognition of 3D objects cadastre based on the existing UPI concept and method. This paper will highlight the complex 3D situation in Kuala Lumpur underground tunnel, a.k.a. ‘SMART’ tunnel (Stormwater Management and Road Tunnel) in relation to the cadastre unique identifier. We will also highlight some future works of the identifier for 3D cadastre objects.