Barioth said
Examine map for clues.
You go back to the office room and examine the map. It's a strange place, and it has no markings on it as words or numbers, but the depiction is very clearly geographical. It's probably a map of the surrounding area. You try to move the map off the wall to see behind it, and as the map falls down you see that there was a secret hole behind the map! It's a crawl space, you could probably fit in it if you tried, although you have no idea of where it may lead. What do you do?