No... Its you who is helping me out. This seems doable, but can you exemplify what you're doing with it so that it will be useful to you? I don't think this is doable with Python - manipulation individual buildings in cities like this. But I can see what methods I can find in the CivIV Python API... (It does sound like a C++ mod to me.) You could probably have a yield on every turn but it wouldn't come from the building as such, but from the Trigger that clears a find-building type method every turn... This wouldn't be visible in the city screen either. iHaH? You'd like to change the amount of health and happiness in a city? I'll have to get back to you on this also... What exactly are you planning to do? Because this seems to me like modding that is beyond the scope of PyScenario (i e historical events and such).