I have 29 buildings. 1 t4 lvl 3 and 1 t4 lvl1 attack build, and 27 lvl 4 t3 guilds. I currently get 630m per 15 nobs, if I upgraded my lvl1 t4 build to lvl2 or 3, how much would I be getting??
Wulf has made a comprehensive guide for this in the strategy section of the forums. Well worth you looking for it to get the best info
If you go to the strategy section of the forums. Look at Wulf's 'Building and Lands' guide. On the first page there is a link to miscellaneous building data which tells you how the nobility exchange works