Scooper ‘Dontsay’ wrote in with an update on the filming of Iron Man:
They are filming Iron Man at Downey Studios. There are yellow direction cards with the initials IM. There was huge crane lifting what look liked a section of a building into the air. Also there is an elaborate set built right at the entrance of the studio with a section of a building overlooking the street.
You can learn more about Downey Studios at the official site.