The apartments are different from penthouses. They have elevators but when you travel there you choose which apartment you want to visit and you spawn there. The apartment front doors are already built and fixed and can't be moved but they do have the trespassing settings.
For penthouses, you can delete everything on that floor but you need to add back an elevator, mailbox and trash chute. Then you can build walls and doors wherever you want. But you can't set a front door which is where the trespassing options are.
It may be a bug but I think it's always been that way. Most likely just bad design, nothing new.
