move domain controller to another site and demote

I have 2 office locations and each is a Site.   Site1 (10.0.0.0) has DC and Exchange Server.  Site2(10.0.1.0) is just a DC.    The company will be consolidating back to one location (Site1).    They would like to reuse the DC in Site2 for another purpose that does not support running on a DC so it must be demoted.

My question is in what order should a perform the tasks.
Should I physically move the server to Site1 before changing its subnet or change subnet before moving?
Should I demote it before doing physical move or subnet change or demote atfer move and subnet change?
Is there a KB with recommended steps for this?
l8techAsked:
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Livin JoseIT Infrastructure and Networking specialistCommented:
Could you provide me more information about your requirement?
1) Please confirm which is the primary domain controller and secondary domain controller?
2) Have you had a chance to check the FSMO roles in the network? Please make sure that the FSMO roles are residing in your first site.
3) I would recommend you to demote the DC before changing the subnet as it will help us to avoid unnecessary network issues during the process.
You can refer the below KB to get an idea of this process,
http://technet.microsoft.com/en-us/library/cc771844(v=ws.10).aspx 

If you are facing any issues when doing demote you can perform a metadata cleanup to remove the second DC from the network as below,
http://serverlabs.blogspot.in/2014/04/how-to-do-server-metadata-clean-up-in.html
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l8techAuthor Commented:
Site1 is the Primary and yes it has the FSMO roles.

DFS is also running between the sites on two folders.  Once a final "file" backup is done on the DC in site2 there is nothing on the server that needs to be retained.   The backup is just in case something did not sync correctly with DFS.  The server will be reformatted before it is redeployed.  I don't know if that changes your opinion on this process.
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Livin JoseIT Infrastructure and Networking specialistCommented:
Yes. I hope that will be fine
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