Her brow furrowed at the new information, this wasn't a profession she knew a fucking thing about. Okay, so there was the guy working late, probably a random other worker or two in the building for the company that might be finishing off some last minute project or something....
"Anyone else in the building?" A beat. "Any other workers?" Maybe that would be the key, if they could fake uniforms that would theoretically get them in and allow them access to other things along the way.