Production bonus if adjacent to a Commercial Hub district. +1 
 Production bonus for each adjacent resource. +1 
 Production bonus for every two adjacent district tiles.Traits
 Great Engineer point per turn.
 Production from every 2 adjacent district tiles.
 Production from each adjacent Commercial Hub tile.
 Production from each adjacent resource tile.
 +2 
 Production
 Production
 ProductionRequirements
 Production
 Gold
 Production bonus if adjacent to a Commercial Hub district. +1 
 Production bonus for each adjacent resource. +1 
 Production bonus for every two adjacent district tiles.Traits
 Great Engineer point per turn.
 Production from every 2 adjacent district tiles.
 Production from each adjacent Commercial Hub tile.
 Production from each adjacent resource tile.
 +2 
 Production
 Production
 ProductionRequirements
 Production
 Gold