Version 1 of the rules states (Page 11)
"The first player who has 10 Prestige without having any loans on the loan display immediately wins the game"
Awesome, thanks! I picked apart the 2e book and even did a PDF search for the word "immediately" and couldn't find it anywhere tied to victory. I then looked at 1e rulebook and it looked to me verbatim(so I'll check when I get home...possibly there are more than 1 version the the first edition rulebook?). Anyways, that will definitely make our victor proud to know!