Wearing its Structure on its Facade

I was struck by this building last night, somewhere between ice skating at the National Sculpture Garden and tapas (7th Street NW between D and E). It's a drawing that turns from elevation to section. It's what if the section sliced through this building but not its neighbors. It's a building turned inside out, wearing its structure on its facade. It's exhibitionist, baring its bones to the street.
Modern in concept, Traditional details, true to form. What is it? More, please.