World’s biggest ad space?

Here is the biggest ad space in Russia, but I think that it actually can be one of the biggest in the whole world. The cars you see in the background are full size cars, complete with lighting in the night. The advertiser is BMW and it is a promotion campaign for their new BMW M5. The ad is more than 6000 square meters big and it is located in Moscow.
The Biggest Ad Space in Russia [englishrussia.com]