How High is Too High for a Roof Deck?

I know you cant tell by the weather but spring is just around the corner. Soon the discussion of "outdoor space" becomes a big topic of conversation. Those that dont have are envious of those that do. Those that have are envious of those that have more...classic.

But, at a certain point, having a beautiful roof deck is scarier than it is warm and inviting. But, at what height does this happen? 30 stories? 40 stories? When you are in the clouds? Naturally, its a matter of opinion, fear and how much wind blasting you can take.

So, do you have outdoor space?