Pretty awesome. From the behind the scenes stuff I've watched on the other DVDs, etc I have a little Bay voice in my head yelling at them, "It's too dark! Lighten it up. It's still too dark!"
No they changed the whole freaking building ...like alot of other building at the background. So i guess this whole scene has CGI.
Bay usually goes almost a month before the film is released into tweaking it. If memory serves me correctly, ROTF almost didn't make it into production in time from all the extras and what not that were added.