heyyyjojo
CGrant56 gave you some very good advice. Please try it out when you can take your time. When refurnishing the items, remember to place it without using MOO. To fine-tune the item's position, hold down the Alt key while moving the item.
We hope your wonderful creation comes to life again.
We'd be happy if you let us know the results.
CGrant56
Thanks for the detailed checking and what the item that I don't have is. I only checked the building structure in Build/Buy mode.
As you pointed out, Sims use the "hidden" bookcase door if it's usable, even if the GF celebrity door leading to the second floor unavailable. So, I first tried grabbing the "hidden" bookcase door without MOO, and the door display turned red, so I thought it might be blocked by something. When clicking on the platform floor, it sometimes doesn't recognize 'Go Here', but this building didn't appear to have any platform floor, so I thought it might just be a door issue. It's hard to know the exact nature of the route problem without testing it in Live Mode. I learned a lot. Thanks again.