Can't place rooms due to a fixed object in apartments

I don't know if you found a solution to this or not but I was having the same issue with 888 Spire apt.  I was able to resolve it by deleting everything (quickest to delete entire rooms) leaving nothing but bare bones, then I built the floors back and retyped the move objects cheat on.  I already had the cheat enabled but retyping worked and I was able to place the full apt "room".