For mass zone, if the bottom level ref does not intersect, then this zone is going to be "not occupiable" and a warning is posted for it.

Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 24.0.0.0 (24.0.0.0)

Syntax

C#
`public static FailureDefinitionId NonOccupiableMassZone { get; }`

Visual Basic
`Public Shared ReadOnly Property NonOccupiableMassZone As FailureDefinitionId Get`

Visual C++
`public: static property FailureDefinitionId^ NonOccupiableMassZone { FailureDefinitionId^ get (); }`

See Also