Check for the existence of Instance in Revit project

Revit
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1

Hello everyone,
I am trying to create an if path that checks the existence of an instance and update the parameters if it exists. It will be in a larger file that is creating massing objects from an excel sheet. I’m thinking I can just a the if path before the “FamilyInstance.bypointandlevel” node. If the components exist I would just bypass the node. This is where I want to add the if statement.

2016-10-11 09.46.34.jpg2592×1456 1.38 MB

I can figure out the “if” node. I cant find a node or series of nodes that checks for the existences of an Instance. Can anyone send me in the right direction?

Thanks!

2

The node you’re looking for is called “All Elements of Family Type”