I'm partial to art deco buildings and architecture that pre-dates WWII for the most part, but something simple and elegant would be nice. Not terribly tall, 50-60 stories, I'm not a huge fan of glass curtains but that's most likely what it'd be. There's a article of every building ever proposed for Detroit that never took shape that ran in the news about 20 years ago. There were some very interesting concepts proposed that would have certainly changed up the skyline.