Dexter was admitted into the building, though he didn't see anybody around that could open the door for him, or push a button to open the door. But of all the things the City had thrown at him, he refused to call this particular moment weird.
There was a strange, disembodied voice that instructed him on where to go, but still nobody who seemed that they would be close enough to be attached to it, given that they seemed to be able to see what he was doing.
"Hello?" Dexter looked around, not quite sure what he should be doing at this point. His voice seemed to bounce mockingly off of the walls back at him. But no answer came, so he just went to the floor he'd been directed to.
He saw the man immediately and hoped this was who had called him.