Oh, of course it would have to be interesting architecturally. But if it has to be monotonous, I'd rather have the "all-glass" facades of the towers from the '70s, '80s, and '90s as opposed to the concrete monoliths of the '50s, '60s, and early '70s.
Though I'd prefer more residential buildings the size of the Carlisle, personally. They'd add a bit of variance to the tallest buildings in the skyline.