There is a suburban office building about halfway between DC and Baltimore that's about 13 stories tall. From the top floor you can see both cities, but you can't get them in a single picture since you have to look out different windows.
There are lots of examples of multiple DC suburban skylines being in the same picture, though. If you don't mind that they're all smaller, of course. Here's Rosslyn (foreground) with Tysons Corner (background):
from flickr user adamsjp2010