You need to destroy all the objects mentioned in the briefing. Then, you simply get out and the building crumble. You get to research the next building and raid it too etc. until you win.
You need to destroy the objects entirely or they won't count as destroyed. I only hope that you brought a lot of explosives with you because on some missions you might need a lot. Fortunatly the Aliens often carry grenades with them which are strong enough to destroy the installations.
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