But wait a second ...
Every single step of Hans' escape plan is so terribly flawed that, had Bruce Willis not kicked him through a 40th story window, he and his henchmen would have been arrested before their ambulance even made it to the first stoplight.
First of all, Hans begins the evening with 13 henchmen. Take another look at their escape van:
"Some lap sitting will be necessary."
How the hell is he planning on fitting 13 grown men in that thing? Let alone the stacks of bearer bonds they came to collect, which, we are shown, require several duffel bags and a hand cart to transport:
"Nobody ate this morning, right?"
There's also the matter of actually exiting the parking garage. We see Hans and his men lock the gates, which is what traps Argyle the limo driver inside for the entire movie. Argyle only gets out because he finally decides to crash his limo into one of the exits:
It took him two hours to figure this out.