This was originally the Auditors Main Building, part of the Bureau of Printing and Engraving and then became an Agriculture building, which it still is. I have always loved it but didn't know until recently what it was. (Managed to finally track it down on Google using an approximate street address.)

I have other pictures of this building, but it's been under renovation forever, and today when I waled by, most of the scaffolding was down, and it looked great.