Why did they move so often?
As I recall, there were 5 different living room sets for this show over an 11 year period. That's a lot of moving consdering they never left New York.
The first move occurred when Margaret died. Understandable that the old apartment would have too many painful memories. The second move was when Danny married Kathy, again undersytandable sinc eshe may have very different taste in decor. But two more moves? Were the sets damaged and they started from scratch?