For Line of Sight purposes, a building has a Line of Sight value of 4 for each floor it has. Models add +4 to their Line of Sight value for every floor they are on above the first one.
Source: Warhammer Armies Project
For Line of Sight purposes, a building has a Line of Sight value of 4 for each floor it has. Models add +4 to their Line of Sight value for every floor they are on above the first one.