Ah right, I misunderstood where you were at. TBH I'm extrapolating hints from the walkthrough I made a looooooooooooong time ago as it's years since I've played the game and several more years since I designed it!
Right, just had another look... there's a Widget on the third floor, which you can pick up. You use this with the Transmat to get to the penthouse suite at the top.
Hope this helps!