Keep your eyes on the road!
During the drone attack at the Stark Expo, Happy drives Natasha to Hammer Industries to help stop the drone attack. In a brief shot, the car skids around a corner as Natasha changes into her Black Widow outfit. This was filmed in Los Angeles near the D.C. Stages & Sets studio that the production was briefly using. Happy makes the left tun off of Mesquit St. on Mateo St, southbound. The Stover Seed Co. (the brick building in the screen shot below) was torn down sometime between 2015 and 2016.
(Iron Man 2, 2010)