I have found the location!
Thanks to Lilusako, who pointed me in the right direction; I did a Google Images search for 'Bank of America lease', and while going through the results, found this picture:
https://images1.loopnet.com/i2/yREzItCF … /image.jpg
The Bank of America building in the centre matches the one in the original screenshot. The building on the right also matches the one at the side of the picture; it's a Regions bank building. I was getting very excited by this picture-have I finally found where we've been looking for all along? The address of the picture is 101 E Kennedy Blvd, in Tampa. That's Tampa in Florida. Which is on the other side of the continent. According to Google, 2162 miles from Los Angeles. No wonder we couldn't find it when we were looking in Los Angeles! I am completely baffled why this location was used, as none of the series is set in Florida, and there would be plenty of places you could get a nice shot for a DVD menu background. Perhaps they used stock footage?
Here's a Google Maps 3D picture of the two buildings:

I think this is roughly the location where the image was taken:

You can see the curved building on the left matches the one in the picture, and you can follow the curve of the road.
Here's a Google Street View image that more or less matches the original screenshot:

It's a view from Bayshore Blvd, which is on the opposite side of the Hillsborough River from the Bank of America building. It looks like a lovely place, but nowhere near Los Angeles! I'm glad that I have found where I was looking for, and thank you to everyone who commented on this thread and helped out or took their own time to look, particularly Lilusako and Mr Martini.
Images above taken from Google.