Or the boost at Apprenticeship made dependent on having a workshop. The Harbor buildings give benefits to coastal tiles, no reason why the IZ buildings can't give boosts to mines, quarries, and/or lumbermills. I can't understand why they thought it was a good idea to throw the design with boosts from overlapping factories out of the window, rather than increase the production cost of everything in industrial and later eras. Now you get to the Industrial Era, you build a Factory, and instead of getting a massive increase in production as you should in the Industrial era, you get a few measly hammers.