Restaurant in upper Washington DC, half underground?

I went to DC in April and ate at a restaurant that was half underground. All that I remember was it was probably between Pennsylvania Avenue NW and New York Avenue NW... I remember a Barnes and Noble being within a few blocks as well... Can anyone give me the restaurant's name?Restaurant in upper Washington DC, half underground?
The downtown Barnes %26amp; Noble is located at 12th and E Streets NW. Knowing what type of cuisine was served at the restaurant might help narrow your search.Restaurant in upper Washington DC, half underground?
i ate at a restaurant one time.