Comment by bluGill
I've seen them, but they were rare already by late 1990s when I started work. I recall my dad having on in the 1970s, and I remember when I started they were tearing some out to put in cubes. Back then they told me offices were cheaper than cube (cube walls need to be stronger than regular walls because they cannot tie into the ceiling for support thus increasing costs), but they believed in the cube plan and so were willing to pay that price.
Cube walls are one off expense, while office square footage is a monthly expense, so if you can fit more people in the same size office by putting up some cubes it makes sense (so long as you ignore the lost productivity).