Brynhilde scouted the place, it all purpose wise looked like a docking storage house in docks of Baldur's Gate. Expect that it was guarded, there was light coming from gaps from the door and there was also minor signs of lots of movement have happened from a shadowy side alley. In filth of the alley bears marks of dozens of naked feet dragged in or out from that door. Likely none slaves are brought from front door but from side but front door was guarded (by four men) where side door was not guarded at all but was locked from inside with no lock on door but barred. Building was made from bricks and stone but had wooden foundation beams and doors were wood but reinforced with iron plates. In her watch she sees in late evening four men depart before she sees then Slad and Bailen come down the street into the docks, looking around when hours turned from late evening to nightly hours.