This node will take inputs for Rooms and a chosen Level, and output the aforementioned Room outlines as Polycurves.
Polycurves
Rooms to Polycurves
This was developed as part of the workflow to convert Rooms to Floors. Revit needs ModelCurves, but to get there Dynamo needs to make Polycurves from the Room boundary. Simply send a list of Rooms as input:
Dynamo Nodes 