BroadwayGuy12 said: "Someone please correct me if I'm wrong, but I believe this is the first musical to win the Prize without a Broadway production. Of Thee I Sing,South Pacific,Fiorello!, andHow to Succeed in Business without Really Tryingall opened on Broadway, andA Chorus Line,Sunday in the Park with George,Rent*,Next to Normal, andHamiltonhad all transferred to Broadway by the time they won.
*I'm not entirely certain of the timeline regardingRent's win. The Prize is typically given in mid-April, andRenthad its first Broadway preview on April 16, 1996, and I'm unsure if the Prize announcement came before or after that date. Still, its Broadway production was already in motion by the time it was awarded."
The Pulitzers were announced on April 9th that year, so technically a week before Rent transferred to Broadway (and obviously awarded based off the off-Broadway script, although I believe no changes were made to the libretto when it transferred). But as you say, obviously the transfer was well in the works by then. This would in fact be the first time a musical won without a Broadway production confirmed.