Reviving this post as I couldnt see any other more relevant ones about how to set Area Type using Dynamo.
The one linked below is useful for READING the area type parameter value, but it also shows us that the storage type is an element ID and not a string.
Area Types are not listed as a category and they are not selectable under the ‘element types’ selection node. Further to this, if you get the parameter value (which returns an element) and then try the Element.ElementTypes node to return all available types nothing happens, it returns null.
Anyone know how to access the unique ElementIDs of the built in Area Types?