You get all of the structures, but if you haven't already got the research to build those same buildings yourself, they will NOT produce anything. So you can either keep the buildings and wait with a productionless planet until you have the right research, or you can scrap the buildings, get some free credits from them, and redevelop the planet with your own tech.
_________________"Anyone without a sense of humour is truly at the mercy of the rest of us."
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