IsCellOwner
Syntax:
IsCellOwner CellID NPC/FactionID (optional)
Example:
IsCellOwner WeynonPrioryHouse BladesFaction IsCellOwner MyImperialCityHouse
Returns 1 if the specified cell is owned by the specified NPC or Faction. If the second parameter is left blank, the function returns 1 if the cell is owned by the player.