Bonus tiles only count for buildings that actually produce the item in question. Placing your technology capital on a research bonus is a waste of the bonus. Same goes for all other capital type buildings.

The way a bonus works is it increases the amount of production of the building by that amount. A 100% manufacturing bonus behaves in game terms as if you had 2 factories on that square. However you only pay BCs on half the second factory. So if you produce 8 MP/SP with a factory on a 100% tile bonus that one factory actually produces 16 total but you are charged for only 4 of the 8 bonus units. Clear as mud?

Capital buildings and other such production enhancers only increase the amount of units you actually produce. To my knowledge they do not increase any bonus amounts you may get from a tile. Of course I could be wrong and I'm sure someone will correct me if I am .

thanks all

The research bonus tiles do stack with the tech capitals, though, in the sense that you can build a lab on the bonus tile--which quadruples the research--and then you can build the tech capital--which gives you 2X * 4X = 8X.