Proper way to remove a distribution server and remote office

Proper way to remove a distribution server and remote office

I have 3 distribution servers and there corresponding remote office that are no longer needed as these sites have been closed.  is there a proper way to remove both the DS and remote site?  currently there still shows agents in these remote offices but none on the agent are currently live and will not be live in these locations.  what happens when i delete the remote office with agents in it?  

Please let me know if there is a proper order to deleting remote office and DS with non live agents in them. 

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