Not likely. Liability reasons, among other things. But, there might be. Might check with City of Denver or whoever deals with tourist things.

I used to work in a fairly tall one at 17th & Curtis. We had equipment on the roof and needed access frequently. It could be interesting, also freakin' cold and windy or hot as hell. Never really wanted to hang out. Might have been cool for fireworks shows, but that wasn't allowed. I'm sure the building employees were up there though.