but the kitties kept telling us that the new house was missing something.
"Uh, ya think??? I left behind 2 cat trees when I left Michigan. I gave them to my friend who had let's say in excess of 20 cats. All well taken care of. She's one of those people whose house you walk into and can't tell there are THAT many cats. Grows her own cat nip. Her garden is filled with it!!

I'm glad you decided to keep the cat tree. I think it also has to do with a "familiar smell" in a new envionment.