[KevinFromTexas]

I would assume that most buildings, especially those that are the most exposed to the river, would be discouraged from having high outdoor public spaces. The wind is an issue high up and it could render some of those spaces unusable on a real windy day. I know that during particularly windy days they will close the observation deck at the Tower of the Americas in San Antonio, and even when they don't, it's windy enough to make me take my hat off so it doesn't go flying off. Also, the Omni Bayfront Hotel in Corpus Christi has a public balcony on the 20th floor facing the bay, and it was incredibly windy up there. Windy enough that it was difficult to stand and was a bit disorienting. I remember the door was hard to swing open.