Placemarked here is the John A. Wilson Building in Washington DC.

The building serves as the city hall for the 'Government of the District of Columbia', the mayor of which is currently Anthony A. Williams

It is located at 1350 Pennsylvania Avenue, NW and is named after a former chair of the city. The building was renamed the 'John A. Wilson building' in 1994.

Here's some more information

Enjoy!
Cheers,
Phil, UK