[link|http://www.vertigobase.com/images/base1.jpg|You mean like this]?

Midflight deplaning being a major hobby of mine (over 1000 hops). I don't bring it to work though and I know for a fact that your chances of success depend a lot on making it to the downwind side of the building for launch. You also need to avoid heat as ZP nylon melts quickly. Plan your freefall past flames for safety. If you're good, you can fly your body away from the building to get some space before opening.

The venturi effects you will experience during your decent will also make for a very hairy time. That said, if I were there and had my rig, I'd have hopped no problem. I'm presently wondering what the effects will be on my carry-on habits. I'm not keen on checking my gear - something I don't like to let out of my sight for obvious reasons.

Expect to spend about $4k for a minimal setup.