Here's what available at Pentagon Row, near DCA - http://www.pentagonrow.com/dining.html

All these places will be relatively packed on a Thursday night, I would imagine - I think Sine's & Chammp's are the two restauarant/bar type places. We also did a happy hour with just drinks at the Doubletree with the revolving rooftop restaurant once. It was a decent place, though not spectacular.