The quoted areas are gross square footage. That includes the stairs, walls, elevators and common areas.
So 1,800 sq ft actually gets you about 1,400 sq ft.
And the prices have probably gone up since the photos were taken.
Back on topic: I took the tire pressure down to 25/30 and there is hardly any difference. I think I'm just going to have to look for another car. It's a shame, but I don't look forward to driving the Boxster any more. And that should never happen.