Are all those Shanghai skyscrapers really full?

I was just wondering about this - and came upon this story:

Mori Building Sells Five Stories of China’s Tallest Property

April 20, 2011, 10:12 PM EDT

April 21 (Bloomberg) -- Mori Building Co., owner of China’s tallest building, said it sold five floors of the property and may offer more in the tower following demand from investors.

Japan’s biggest privately held developer said it sold the 68th to 72nd floors of the 101-story Shanghai World Financial Center. The 16,248-square-meter (174,828-square-foot) space was sold at an average price of 82,142 yuan ($12,588) per square meter, according to information from government-run Shanghai Real Estate Trading Center, which tracks property transactions.

So they are selling the floors, but it still doesn't talk about occupancy... I just can't imagine who is in all these building...