I can relate to this too... I think sometimes for me the room feels like a "container" that holds my feelings, and memories. When I leave her messages, I imagine that they are in that room and it's comforting. It is good to talk to your therapist about how you feel, and even to have a chance to say good-bye to the room before you leave it. And also to know that you and your therapist carry everything that happened, and can bring it with you. It won't all get lost when you move somewhere new. I think familiar things in the new office are comforting too, like if she brings her furniture, or blankets, etc.