I heartily agree with @rosemarythyme, leave the current coops where they are and build out the current run into your new coop. You’ll be amazed how nice it is to be able to stand up in the coop! I’d make the new run as large as you possibly can - cover most and leave some open, maybe under the tree (covered with fencing or hardware cloth of course). If you can, at least double the size of the run you have now. And please post lots of pics! 

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