Race Bonus Bulildings

Which building are we talking about? Is it the Biosphere Modulator? If this is the case, that building (although the description doesn't say this) will add about 3 more PQ to the planet in addition to giving 10% industry.

Well, I don't know the specifics of what you are talking about from the information given...but in addition to Loup's comment you also need to look at upkeep cost.

Lets say you build 5 regular industrial buildings and they have 5 upkeep and produce 10 industry. So you are producing 50 industry for a cost of 75bc (been playing Eve too much lately..I almost said ISK) That's 1.5 bc per industry point.

Now you build one of your 10% bonus buildings, but it's upkeep is only 1. You are adding 5 industry for a cost of only 6bc, lowering your cost on this building to 1.2 bc per industry point, and your overall cost to 1.47 bc per industry point.

(all of that is assuming 100% spending of course. The difference is bigger if your spending is throttled back..and yes, those are theoretical numbers just to point you to something else to consider when looking at those bonus buildings.)

You may also want to consider the existence of the civilization capital or the initial colony. Given that the initial colony provides 16 industry and most if not all base industry buildings provide 4, you only need 6 more factory buildings until the 10% begins to pay off. With a civilization capital, this drops to a mere 4.

This is without even considering mining bases, but we won't go there.

Particularly in the colonization stage, that could be a useful building to have on your homeworld.

Just my 2bc.

hmmm, ok.
The did no thought about the running costs.

The bio-modulator adds 3 to the planet's quality? I thought the weather control thingy does that. I'll check that!

Thank you!

They both add 3 tiles, though the Weather Control Zenith doesn't give an industry bonus IIRC. What's nice is having both techs

I thought that these techs cannot be traded?
Is is possible to steal them? (By conquering a planet - or maybe via spys?)

I misspoke; I meant having both improvements, not necessarily having both techs. The minor races seem to have access to them and the improvements will remain after you invade, so if you have one of the techs you can end up with some planets with both Weather Control and Biosphere modulator if you invade the right people.