It's the JPMorgan Chase Tower in Dallas, deisigned by the penultimate Chicago architectural firm SOM. They also did a sister building, the Trammell Crow Center. Note the similar shapes incorporated into both building's crowns
As for my opinion on the subject matter: I think this building stradles the line between novelty and design. The hole in the building is the most dominating feature on the building. Without the hole the building is a tenement, nothing more. It would be interesting if the hung a giant Chicago flag from the top of the hole, or a huge statue of Abe Lincoln or Obama Barak (after he's President, of course.)
