NEED HELP!!!

Hi,

I am am looking for an old scifi film I watched as a kid about 20years ago. I can't remember if I watched this on vhs or if it was on the tele.

basically it's a small group of people that get trapped in some sort of office building and a killer robot is chasing them around. The robot reminds me of the bad robot in robocop 2 but more chrome like. I remember the robot running along the walls chasing the people and the film being generally quite gruesome. Also remember them being in an elevator quite a lot too. 

Any idea what this film is? Any help would be much appreciated 

Thanks