[VikingDutchman]

^ Also true.

But I took the feature-list to suggest that it was not a private elevator to the penthouse from the ground, but rather WITHIN the penthouse, an elevator that goes just between the two floors. The alternative being to merely a staircase between the two levels. I think the penthouse residents will still have to use the ordinary elevator to get up there (slumming it with Joe AverageInvestmentBanker)

I may be interpreting it wrong of course.