What happens if I purchase a building halfway through construction?

Question

If I purchase a building that is halfway through construction, what happens to the extra production? Is the cost of purchasing the building lowered? Do I receive a cash payment, similar to an opponent finishing a wonder I was building? Or does the production just disappear?

Answer 1

You pay the full purchase price and lose the in-progress production. There are no refunds, discounts, or benefits.

So, you generally want to avoid buying buildings that you have mostly completed.

For units, buying a unit has no effect on the in-progress production.