there is also a cost associated with maintaining different workspaces and equipment for employees of different status, and it's a company's choice to take that on.
typically when discussing working conditions, you're talking about minimum standards. it's not very smart to refuse to improve working conditions across the board.
you said in a reply further down that you were an executive level manager, you should have told HR to shove it because your individual performance would be impacted by the collective output of your employees, and the costs of improving working conditions would be returned in several multiples, some of which you might receive as a bonus.
it was, however, your choice and right not to do this. :)