Hi, I have a question: Is it possible to have a Building to produce a resource only if another resource is available in the City in which the building is? Or for example two other resources, or one or the other resource, or one resource and either one of two other resources? Now another more practical example: You have iron and coal and the building produces steal only if iron and either coal or oil are available in the city. Another example: You have cotton, the building produces cloth only if cotton is available in the city. Is there anything like that already done in one of the mods? Is there a python script for it? Let me know.