Vertical Extensions on these Walls overlap. This can cause undesirable Joins. Try starting with no overlap and extend the Walls toward one another.

public static FailureDefinitionId ExtensionsOverlapWarning { get; }

Public Shared ReadOnly Property ExtensionsOverlapWarning As FailureDefinitionId
	Get

public:
static property FailureDefinitionId^ ExtensionsOverlapWarning {
	FailureDefinitionId^ get ();
}