To be fair? I don't think he really did. It was a room with filing documents for a lot of buildings. Of course they would have the documents for the Retrospec building. It's a building in town.

The fact that they were torn out so hastily is the important part. Well, that and apparently nobody's updated those files in a long time, so I don't think there's a lot of new construction in town. [Or the mayor's office was lax. She wasn't putting that past him.]