I'm fairly certain that the Artisan science building cost reduction causes a display error because the building costs are rounded and decimalized...but the actual cost VS the cost displayed are different.
e.g. Here is my Artisan science.
Artisan 20,510 -5.1% Construction Time & -5.1% Construction & Raze Cost
Building cost for a building is 804 gc
However, when I build a building, it takes away 805 gc.
Can be problematic when making calculations beforehand, only to find out that the costs were higher than expected.
Thanks!
-Gidoza