Revit setup for OpenBIM/Revit IFC spatial hierarchy

The following attributes may be set on the IfcSite. If you have a Toposurface object overriding your IfcSite object representation as detailed in Revit Geolocation, the procedure is slightly different. Do not implement both procedures simultaneously. Note that in Revit, only a single IfcSite may exist. It is not possible to create multiple sites.

Attribute Name	Required	Procedure with Toposurface	Procedure without Toposurface
Name	Yes	Create a new IfcName instance parameter, assigned to the Toposurface object.	Create a new SiteName instance parameter, assigned to the Project Information object.
Description		Create a new IfcDescription instance parameter, assigned to the Toposurface object.	Create a new SiteDescription instance parameter, assigned to the Project Information object.
ObjectType		Create a new IfcObjectType instance parameter, assigned to the Toposurface object.	Create a new SiteObjectType instance parameter, assigned to the Project Information object.
LongName	Yes	Create a new IfcLongName instance parameter, assigned to the Toposurface object.	Create a new SiteLongName instance parameter, assigned to the Project Information object.
LandTitleNumber	Yes	Create a new IfcLandTitleNumber instance parameter, assigned to the Toposurface object.	Create a new SiteLandTitleNumber instance parameter, assigned to the Project Information object.

The following attributes may be set on the IfcBuilding. Note that in Revit, only a single IfcBuilding may exist. It is not possible to create multiple buildings.

Attribute Name	Required	Procedure
Name	Yes	Fill out the Building Name field in the Project Information dialog.
Description		Create a new BuildingDescription instance parameter, assigned to the Project Information object.
ObjectType		Create a new BuildingObjectType instance parameter, assigned to the Project Information object.
LongName	Yes	Create a new BuildingLongName instance parameter, assigned to the Project Information object.