This is an awesome building. One of my new favorites in DC. The only major issue with this shot is the light. Way too flat to get the building to pop. It's probably worth getting up before sunrise or sunset to see if you can get better color.
This is a terrific photo of a very impressive building. Your composition and point of view are highly sympathetic to the architectural style and "personality" of the subject; you seem to have achieved the maximum visual impact of which this building is capable. This photo would not look out of place on the cover of a fine architecture magazine or book. 9.