The interior of the warehouse shows that it is decidedly NOT abandoned. First, he'll notice the fairly large stores of goods, then he'll notice the... one, two, no,<em>four</em>thugs, making slow and easy patrols; two on the catwalks, above the floor, and two more patrolling between the boxes and pallets of goods.<br/><br/>The second thing he'd notice would be the soft but quite unpleasant hum filling the building that can be felt in the bones and teeth as well as heard. Make a DC 12 Fort save, or take a –1<br/>penalty on all Intelligence-, Wisdom-, and Charisma-based skill checks, until the headache fades.