Let's see; they had a True Name of one of the targets in the building, the exact floorplans, the history of the building, items from the building, the use name of the primary target, advertising from when the building was functional, a long ritual (that the other party members had to defend from corrupted fae-hounds), knowledge of the zombies in the building (former homeless), a scale model of the building, plus the basic Lore of the wizard. And maybe some other stuff they'd researched as well.
The wizard elected to put the excess shifts into duration. With all of that, they still had a bit of a fight on their hands, but managed to drive off the corrupted Fae into the Never-Never and force him to use Sponsored Magic to survive...which drew the attention of Mab. When the party established that the Fae had been corrupted and was no longer Winter, Mab conceded that the Accords had not been violated.
The Queen then went on to thank them for 'bringing the Queen of Winter into the heart of Summer' (the city is a Summer stronghold), and vanished. Needless to say, the local Summer emissary was not pleased by this...although he WAS happy to get rid of a serious menace in town.
So, it was a pretty epic ritual that the group isn't likely to get to do again anytime soon.