[Revit] Copy shared parameters from rooms of a linked file to your own spaces

It is very useful to be able to copy shared parameter from a linked file to you own file especially if you want to make a stable link to an external database or maintain data consistency between different models.

The Autodesk Space Naming Utility is very useful but limited to room/space number and name. With the following script methodology you are able to copy any shared or built in parameter.

Unfortunately, Space property «Room» return None when the room is in a linked file. Hopefully there is a workaround which has been highlighted here by Revitalizer. You can use the GetRoomAtPoint as followed (same in the other way to get space from room).

from Autodesk.Revit.DB import *
from Autodesk.Revit.DB.Mechanical import Space
from Autodesk.Revit.DB.Architecture import Room
from Autodesk.Revit.UI import UIApplication
from System import Guid

uidoc = __revit__.ActiveUIDocument
doc = __revit__.ActiveUIDocument.Document
getselection = uidoc.Selection.GetElementIds
app = __revit__.Application

#reference desired link
for e in app.Documents:
	if e.Title == "[LinkName].rvt":
		lien = e

#Reference the parameter you want to copy by GUID or BuiltInParameter
paramguid = Guid("88938699-b86d-4efa-aeb6-ce66d17d7755")

t = Transaction(doc, "Copy shared parameter from rooms to spaces")

t.Start()
#Get all spaces in the current project
for space in FilteredElementCollector(doc).OfCategory(BuiltInCategory.OST_MEPSpaces):	
	if space.Location != None: #Check if the space is placed
		#Get room at space insertion point location. Credit to Revitalizer : https://forums.autodesk.com/t5/revit-api/mep-space-class-room-property-returns-null-with-linked-models/td-p/3650268
		room = lien.GetRoomAtPoint(space.Location.Point)
		#Check if there is actually a room at this location
		if room != None:
			#Call desired parameter in both room and space
			spaceparam = space.get_Parameter(paramguid)
			roomparam = room.get_Parameter(paramguid)
			try:
				#Try to set space parameter value with room parameter value. It can fail if value is null for exemple 
				spaceparam.Set(roomparam.AsString())
			except:
				pass
t.Commit()

__window__.Close()