Setting up the Project Altitude properly and displaying its values for BIM Submission in Singapore requires a bit of insight of the Reference Levels function of ARCHICAD which the local practice might not be fully aware of.
Architectural team shall setup a Project Base File that can be used by the rest of the project partners to facilitate smooth coordination. Base file can be called as a project specific template that consist of the common project settings like Location, Orientation, Grids and Levels. This is required regardless of the BIM authoring tool selected and if more than one tool (ex. Architectural in ARCHICAD, Structural in Tekla and MEP in REVIT) is used then it is good to have the setup in all selected BIM authoring tools. The settings shall be exchanged through IFC as well.
Let us see in this post on how to setup the project base file in ARCHICAD and REVIT.
ASIABIM 