Extreme Exposure of Clouds over Modern Building, North Point Cambridge, MA, a photo by Greg DuBois Photography on Flickr.
Totally random that I was in position to realize this shot. The building is still under construction, after a lot of research I found out it's the new headquarters of EF Education First, 1 Education St. It was really windy and very cold, had to wait some time to get the right clouds.
1.5 minute exposure. Canon 16-35 f/2.8L II, Tiffen 3.0 ND filter.