Under Rights of Superficies, I am the possessor for thirty years of two rai of land and the house my American wife and I built and in which we have retired. The tabian bahn is in the name of our surrogate daughter, who lives here also with her husband and child and will inherit the house. Before even attempting to establish myself as possessor to Immigration, the officer indicated to our "daughter" that he needed her tabian bahn. That apparently simplified everything, without having to explain or show any documents establishing me as possessor. We have done our extensions this way for the past eight years. The OP may want to just let his girlfriend go with him and show her tabian bahn for the house and not mention the usufruct, which could turn out to be a documentation inconvenience.