Was applying maple timbers to my plot tonight and noticed that in general, buildings had a 600/800 carpentry requirement - 600 minimum, 800 optimal. It seems that looking at silos, shops, and houses, these buildings generally have a 200 point gap between minimum and optimal skill levels.
However, the Tier 4 Storehouse has a 600/875 requirement for maple timbers. In fact, every resource for a Tier 4 storehouse seems to have a 275 point gap between minimum and optimal levels.
I haven't tried all the various storehouses, but I did add a tier 1 storehouse just to see how it would look, and it had a 200 point gap.
Bug? Or deliberate design? I haven't noticed anything else with a 275 gap, just the tier 4 storehouses.
Yildar
Istaria's Chosen, Order